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Schneebeli A, Barbero M, Filardo G, Testa E, Riegger M, Sangiorgio A, Cescon C, Soldini E, Falla D. Shear Wave Tensiometry Can Detect Loading Differences Between Operated and Unaffected Achilles Tendon. Foot Ankle Int 2023; 44:1295-1304. [PMID: 37924256 DOI: 10.1177/10711007231201156] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2023]
Abstract
BACKGROUND The clinically relevant healing process of a ruptured and repaired Achilles tendon (AT) can last more than a year. The purpose of this cross-sectional study was to test if shear wave tensiometry is able to detect AT loading changes between a surgically managed AT rupture versus the unaffected contralateral tendon. Our secondary aims were to evaluate differences in mechanical properties when measured with myotonometry and morphological properties of the tendons measured with ultrasonographic imaging. METHODS Twenty-one patients with surgically treated AT ruptures were investigated 12-37 months after surgery. Tendon load was measured using a shear wave tensiometer composed of an array of 4 accelerometers fixed on the tendon. Shear wave speed along the Achilles tendon was evaluated at different levels of ankle torque for both the operated and the unaffected side. Mechanical properties of the tendons were evaluated using MyotonPRO and morphological properties using ultrasonographic imaging. Friedman test was used to assess differences in AT wave speed, stiffness, thickness, and cross-sectional area between the operated and the unaffected tendon. RESULTS We found a significant shear wave speed difference between sides at every ankle joint torque (P < .05) with a large effect size for the lowest ankle torque and small to medium effect sizes for higher ankle torque. Stiffness, thickness, and cross-sectional area of the operated tendon remained significantly higher compared to the unaffected side. CONCLUSION In this cohort, we found that shear wave tensiometry can detect differences between operated and unaffected AT during a standardized loading procedure. The shear wave speed along the operated tendon, as well as the mechanical and morphologic properties, remains higher for 1-3 years after a rupture. LEVEL OF EVIDENCE Level III, case-control study.
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Affiliation(s)
- Alessandro Schneebeli
- Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
- Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Manno, Switzerland
| | - Marco Barbero
- Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Manno, Switzerland
| | - Giuseppe Filardo
- Service of Orthopaedics and Traumatology, Department of Surgery, EOC, Lugano, Switzerland
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland
| | - Enrique Testa
- Service of Orthopaedics and Traumatology, Department of Surgery, EOC, Lugano, Switzerland
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland
| | - Martin Riegger
- Service of Orthopaedics and Traumatology, Department of Surgery, EOC, Lugano, Switzerland
- Faculty of Biomedical Sciences, Università della Svizzera Italiana, Lugano, Switzerland
| | - Alessandro Sangiorgio
- Service of Orthopaedics and Traumatology, Department of Surgery, EOC, Lugano, Switzerland
| | - Corrado Cescon
- Rehabilitation Research Laboratory 2rLab, Department of Business Economics, Health and Social Care, University of Applied Sciences and Arts of Southern Switzerland, Manno, Switzerland
| | - Emiliano Soldini
- Competence Centre for Healthcare Practices and Policies, Department of Business Economics, Health, and Social Care, University of Applied. Sciences and Arts of Southern Switzerland, Manno, Switzerland
| | - Deborah Falla
- Centre of Precision Rehabilitation for Spinal Pain (CPR Spine), School of Sport, Exercise and Rehabilitation Sciences, College of Life and Environmental Sciences, University of Birmingham, Birmingham, UK
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Lu Z, Sun D, Kovács B, Radák Z, Gu Y. Case study: The influence of Achilles tendon rupture on knee joint stress during counter-movement jump - Combining musculoskeletal modeling and finite element analysis. Heliyon 2023; 9:e18410. [PMID: 37560628 PMCID: PMC10407047 DOI: 10.1016/j.heliyon.2023.e18410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 07/15/2023] [Accepted: 07/17/2023] [Indexed: 08/11/2023] Open
Abstract
BACKGROUND Presently, the current research concerning Achilles tendon rupture repair (ATR) is predominantly centered on the ankle joint, with a paucity of evidence regarding its impact on the knee joint. ATR has the potential to significantly impede athletic performance and increase tibiofemoral contact forces in athletes. The purpose of this study was to prognosticate the distribution of stress within the knee joint during a countermovement jump through the use of a simulation method that amalgamated a musculoskeletal model of a patient who underwent Achilles tendon rupture repair with a finite element model of the knee joint. METHODS A male elite badminton player who had suffered an acute Achilles tendon rupture in his right leg one year prior was selected as our study subject. In order to analyze his biomechanical data, we employed both the OpenSim musculoskeletal model and finite element model to compute various parameters such as joint angles, joint moments, joint contact forces, and the distribution of knee joint stress. RESULTS During the jumping phase, a significantly lower knee extension angle (p < 0.001), ankle dorsiflexion angle (p = 0.002), peak vertical ground reaction force (p < 0.001), and peak tibiofemoral contact force (p = 0.009) were observed on the injured side than on the uninjured side. During the landing phase, the ankle range of motion (ROM) was significantly lower on the injured side than on the uninjured side (p = 0.009), and higher peak vertical ground reaction forces were observed (p = 0.012). Additionally, it is logical that an injured person will put higher load on the uninjured limb, but the finite element analysis indicated that the stresses on the injured side of medial meniscus and medial cartilage were significantly greater than the uninjured side. CONCLUSIONS An Achilles tendon rupture can limit ankle range of motion and lead to greater joint stress on the affected area during countermovement jumps, especially during the landing phase. This increased joint stress may also transfer more stress to the soft tissues of the medial knee, thereby increasing the risk of knee injury. It is worth noting that this study only involves the average knee flexion angle and load after ATR in one athlete. Caution should be exercised when applying the conclusions, and in the future, more participants should be recruited to establish personalized knee finite element models to validate the results.
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Affiliation(s)
- Zhenghui Lu
- Faculty of Sports Science, Ningbo University, Ningbo, 315211, China
| | - Dong Sun
- Faculty of Sports Science, Ningbo University, Ningbo, 315211, China
| | - Bálint Kovács
- Faculty of Sports Science, Ningbo University, Ningbo, 315211, China
- Research Institute of Sport Science, Hungarian University of Sport Science, Budapest, 1123, Hungary
| | - Zsolt Radák
- Research Institute of Sport Science, Hungarian University of Sport Science, Budapest, 1123, Hungary
| | - Yaodong Gu
- Faculty of Sports Science, Ningbo University, Ningbo, 315211, China
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3
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van Dijk K, Khair RM, Sukanen M, Cronin NJ, Finni T. Medial gastrocnemius muscle fascicle function during heel-rise after non-operative repair of Achilles tendon rupture. Clin Biomech (Bristol, Avon) 2023; 105:105977. [PMID: 37156191 DOI: 10.1016/j.clinbiomech.2023.105977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 03/23/2023] [Accepted: 04/27/2023] [Indexed: 05/10/2023]
Abstract
BACKGROUND To better understand muscle remodelling in dynamic conditions after an Achilles tendon rupture, this study examined the length of medial gastrocnemius muscle fascicles during a heel-rise at 6- and 12-months after non-operative ATR treatment. METHODS Participants (15 M, 3F) were diagnosed with acute Achilles tendon rupture. Medial gastrocnemius subtendon length, fascicle length and pennation angle were assessed in resting conditions, and fascicle shortening during bi- and unilateral heel-rises. FINDINGS Fascicle shortening was smaller on the injured side (mean difference [95% CI]: -9.7 mm [-14.7 to -4.7 mm]; -11.1 mm [-16.5 to -5.8 mm]) and increased from 6- to 12 months (4.5 mm [2.8-6.3 mm]; 3.2 mm [1.4-4.9 mm]) in bi- and unilateral heel-rise, respectively. The injured tendon was longer compared to contralateral limb (2.16 cm [0.54-3.79 cm]) and the length decreased over time (-0.78 cm [-1.28 to -0.29 cm]). Tendon length correlated with fascicle shortening in bilateral (r = -0.671, p = 0.002; r = -0.666, p = 0.003) and unilateral (r = -0.773, p ≤ 0.001; r = -0.616, p = 0.006) heel-rise, at 6- and 12-months, respectively. In the injured limb, the change over time in fascicle shortening correlated with change in subtendon length in unilateral heel-rise (r = 0.544, p = 0.02). INTERPRETATION This study showed that the lengths of the injured tendon and associated muscle can adapt throughout the first year after rupture when patients continue physiotherapy and physical exercises. For muscle, measures of resting length may not be very informative about adaptations, which manifest themselves during functional tasks such as unilateral heel-rise.
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Affiliation(s)
- Koen van Dijk
- Faculty of Sport and Health Sciences, Neuromuscular Research Center, University of Jyväskylä, Rautpohjankatu 8, 40700 Jyväskylä, Jyväskylä, Finland
| | - Raad M Khair
- Faculty of Sport and Health Sciences, Neuromuscular Research Center, University of Jyväskylä, Rautpohjankatu 8, 40700 Jyväskylä, Jyväskylä, Finland
| | - Maria Sukanen
- Faculty of Sport and Health Sciences, Neuromuscular Research Center, University of Jyväskylä, Rautpohjankatu 8, 40700 Jyväskylä, Jyväskylä, Finland
| | - Neil J Cronin
- Faculty of Sport and Health Sciences, Neuromuscular Research Center, University of Jyväskylä, Rautpohjankatu 8, 40700 Jyväskylä, Jyväskylä, Finland; School of Sport & Exercise, University of Gloucestershire, Gloucestershire, UK
| | - Taija Finni
- Faculty of Sport and Health Sciences, Neuromuscular Research Center, University of Jyväskylä, Rautpohjankatu 8, 40700 Jyväskylä, Jyväskylä, Finland.
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Radovanović G, Bohm S, Arampatzis A, Legerlotz K. In Achilles Tendinopathy the Symptomatic Tendon Differs from the Asymptomatic Tendon While Exercise Therapy Has Little Effect on Asymmetries-An Ancillary Analysis of Data from a Controlled Clinical Trial. J Clin Med 2023; 12:jcm12031102. [PMID: 36769750 PMCID: PMC9918090 DOI: 10.3390/jcm12031102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2022] [Revised: 01/27/2023] [Accepted: 01/30/2023] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND As inter-limb asymmetries can be associated with higher injury risk, we aimed to investigate their role in Achilles tendinopathy patients. METHODS In Achilles tendinopathy patients (n = 41), we assessed inter-limb asymmetries of mechanical, material, and morphological musculoskeletal properties and function and how those were affected by 12 weeks of exercise intervention (high-load protocol, n = 13; Alfredson protocol, n = 11). Moreover, we assessed whether asymmetry reductions correlated with improved Patient-Reported Outcomes (VISA-A score). RESULTS At baseline, tendinopathic tendons demonstrated lower tendon force (p = 0.017), lower tendon stress (p < 0.0001), larger tendon cross-sectional area (CSA) (p < 0.001), and increased intratendinous (p = 0.042) and tendon overall (p = 0.021) vascularization. For the high-load group, PRE-to-POST asymmetry comparisons revealed an asymmetry increase for the counter-movement jump (CMJ) (p = 0.034) and PRE-to-POST VISA-A score improvements correlated with CSA asymmetry reductions (p = 0.024). Within the Alfredson group, PRE-to-POST VISA-A score improvements correlated with CMJ asymmetry reductions (p = 0.044) and tendon stiffness asymmetry increases (p = 0.037). POST-to-POST in-between group comparisons revealed lower asymmetry in the high-load group for tendon elongation (p = 0.021) and tendon strain (p = 0.026). CONCLUSIONS The tendinopathic limb differs from the asymptomatic limb while therapeutic exercise interventions have little effect on asymmetries. Asymmetry reductions are not necessarily associated with tendon health improvements.
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Affiliation(s)
- Goran Radovanović
- Movement Biomechanics, Institute of Sports Sciences, Humboldt-Universität zu Berlin, 10099 Berlin, Germany
- Department Performance, Neuroscience, Therapy and Health, Faculty of Health Sciences, Medical School Hamburg—University of Applied Sciences and Medical University, 20457 Hamburg, Germany
- Institute of Interdisciplinary Exercise Science and Sports Medicine, Faculty of Health Sciences, Medical School Hamburg—University of Applied Sciences and Medical University, 20457 Hamburg, Germany
- Correspondence: ; Tel.: +49-030-2093-46052
| | - Sebastian Bohm
- Department of Training and Movement Sciences, Humboldt-Universität zu Berlin, 10099 Berlin, Germany
| | - Adamantios Arampatzis
- Department of Training and Movement Sciences, Humboldt-Universität zu Berlin, 10099 Berlin, Germany
| | - Kirsten Legerlotz
- Movement Biomechanics, Institute of Sports Sciences, Humboldt-Universität zu Berlin, 10099 Berlin, Germany
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5
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Aufwerber S, Naili JE, Grävare Silbernagel K, Ackermann PW. No effects of early functional mobilization on gait patterns after acute Achilles tendon rupture repair. J Orthop Res 2022; 40:1932-1942. [PMID: 34674300 DOI: 10.1002/jor.25199] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 10/06/2021] [Accepted: 10/18/2021] [Indexed: 02/04/2023]
Abstract
This study aimed to compare recovery of gait patterns in patients treated with early functional mobilization (EFM) or standard treatment (ST) after Achilles tendon rupture repair. Second, this study aimed to explore associations between gait patterns and tendon elongation and calf muscle atrophy, respectively. Forty-seven patients (12 females), mean age 38.7 (7.3) years, were included. Patients were postoperatively randomized to EFM (n = 29), including immediate weightbearing and ankle motion for 6 weeks, or ST (n = 18), with 2 weeks of unloading in a plaster cast followed by 4 weeks of weightbearing in an orthosis. Three-dimensional gait analyses were performed at 8 weeks and 6 months postoperatively to evaluate ankle and knee kinematics and kinetics. Ultrasound imaging was performed to assess tendon length and calf muscle atrophy. At 8 weeks, there were no significant group differences in ankle and knee kinematics and kinetics, while side-to-side differences between injured and uninjured side were present within both groups. At 6 months, the ST group exhibited higher generating ankle power and greater peak moments in ankle and knee compared to the EFM group. In both groups, peak ankle dorsiflexion angle was greater on the injured side compared to the uninjured side. No correlations were found between ankle joint gait deviations and degree of tendon elongation or muscle atrophy. Clinical significance: The accelerated rehabilitation regimen with EFM did not result in a more symmetrical gait pattern. The gait pattern deviations in the ankle joint were not related to the degree of muscle atrophy or tendon elongation.
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Affiliation(s)
- Susanna Aufwerber
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden.,Karolinska University Hospital, Women's Health and Allied Health Professionals Theme, Medical Unit Occupational Therapy and Physiotherapy, Stockholm, Sweden
| | - Josefine E Naili
- Department of Women's and Children's Health, Karolinska Institutet, Stockholm, Sweden
| | | | - Paul W Ackermann
- Department of Molecular Medicine and Surgery, Karolinska Institutet, Stockholm, Sweden.,Department of Trauma, Acute Surgery and Orthopaedics, Karolinska University Hospital, Stockholm, Sweden
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Mansfield K, Dopke K, Koroneos Z, Bonaddio V, Adeyemo A, Aynardi M. Achilles Tendon Ruptures and Repair in Athletes-a Review of Sports-Related Achilles Injuries and Return to Play. Curr Rev Musculoskelet Med 2022; 15:353-361. [PMID: 35804260 DOI: 10.1007/s12178-022-09774-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 06/21/2022] [Indexed: 11/26/2022]
Abstract
PURPOSE OF REVIEW Achilles tendon ruptures (ATR) are detrimental to sports performance, and optimal treatment strategy and guidelines on return to play (RTP) remain controversial. This current review investigates the recent literature surrounding nonoperative versus operative management of ATR, clinical outcomes, and operative techniques to allow the athlete a successful return to their respective sport. RECENT FINDINGS The Achilles tendon (AT) is crucial to the athlete, as it is essential for explosive activities such as running and jumping. Athletes that sustain an ATR play in fewer games and perform at a lower level of play compared to age-matched controls. Recent studies also theorize that ATRs occur due to elongation of the tendon with fatigue failure. Biomechanical studies have focused on comparing modes of fixation under dynamic loading to recreate this mechanism. ATRs can be career-ending injuries. Fortunately, the recent incorporation of early weight-bearing and functional rehabilitation programming for non-operative and operative patients alike proves to be beneficial. Especially for those treated nonoperatively, with the incorporation of functional rehabilitation, the risk of re-rupture among non-operative patients is beginning to approach the historical lower risk of re-rupture observed among patients treated operatively. Despite this progress in decreasing risk of re-rupture particularly among non-operative patients, operative managements are associated with unique benefits that may be of particular interest for athletes and active individuals. Recent studies demonstrate that operative intervention improves strength and functional outcomes with more efficacy compared to nonoperative management with rehabilitation. The current literature supports operative intervention in elite athletes to improve performance and shorten the duration to RTP. However, we acknowledge that surgical intervention does have inherent risks. Ultimately, most if not all young and/or high-level athletes with an ATR benefit from surgical repair, but it is crucial to take a stepwise algorithmic approach and consider other factors, which may lead towards nonoperative intervention. These factors include age, chronicity of injury, gap of ATR, social factors, and medical history amongst others in this review.
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Affiliation(s)
- Kirsten Mansfield
- Center for Orthopaedic Research and Translational Science, The Pennsylvania State University, 500 University Drive, H089, Hershey, PA, 17033, USA
| | - Kelly Dopke
- Center for Orthopaedic Research and Translational Science, The Pennsylvania State University, 500 University Drive, H089, Hershey, PA, 17033, USA
| | - Zachary Koroneos
- Center for Orthopaedic Research and Translational Science, The Pennsylvania State University, 500 University Drive, H089, Hershey, PA, 17033, USA
| | - Vincenzo Bonaddio
- Penn State Milton Hershey Medical Center Department of Bone and Joint, 30 Hope Drive, Building A; PO Box 859, Hershey, PA, 17033, USA
| | - Adeshina Adeyemo
- Penn State Milton Hershey Medical Center Department of Bone and Joint, 30 Hope Drive, Building A; PO Box 859, Hershey, PA, 17033, USA
| | - Michael Aynardi
- Penn State Milton Hershey Medical Center Department of Bone and Joint, 30 Hope Drive, Building A; PO Box 859, Hershey, PA, 17033, USA.
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Sun D, Song Y, Cen X, Wang M, Baker JS, Gu Y. Workflow assessing the effect of Achilles tendon rupture on gait function and metatarsal stress: Combined musculoskeletal modeling and finite element analysis. Proc Inst Mech Eng H 2022; 236:676-685. [PMID: 35311405 DOI: 10.1177/09544119221085795] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Achilles tendon rupture (ATR) incidence has increased among badminton players in recent years. The foot internal stress was hard to obtain through experimental testing. The purpose of the current research is to develop a methodology that could improve the finite element model derived foot internal stress prediction for ATR clinical and rehabilitation applications. A subject-specific musculoskeletal model was combined with a 3D finite element model to predict the metatarsal stress. The 80% point during the push-off phase of walking was selected for the comparing between injured and uninjured sides. The surgical repaired Achilles tendon (AT) after 12 months was elongated by 5.5% than the uninjured tendon. At 80% point of stance phase, the ankle plantarflexion angle and AT force decreased by 39.6% and 21.9% on the injured side, respectively. The foot inversion degree increased by 22.9% and was accompanied by the redistribution of metatarsals von Mises stress. The stresses on the fourth and fifth metatarsals were increased by 59.5% and 85.9% on the injured side. The workflow is available to assess musculoskeletal disorders and obtain foot internal stress after ATR. The decreased ankle plantar flexor force may be affected by triceps surae muscle atrophy and weakened force transmission ability of elongated AT. The increased von Mises stress on fourth and fifth metatarsals accompanied by higher foot inversion may increase the ankle lateral sprain injury risk.
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Affiliation(s)
- Dong Sun
- Faculty of Sports Science, Ningbo University, Ningbo, China
| | - Yang Song
- Faculty of Sports Science, Ningbo University, Ningbo, China.,Doctoral School on Safety and Security Sciences, Obuda University, Budapest, Hungary.,Faculty of Engineering, University of Szeged, Szeged, Hungary
| | - Xuanzhen Cen
- Faculty of Sports Science, Ningbo University, Ningbo, China.,Doctoral School on Safety and Security Sciences, Obuda University, Budapest, Hungary.,Faculty of Engineering, University of Szeged, Szeged, Hungary
| | - Meizi Wang
- Faculty of Sports Science, Ningbo University, Ningbo, China.,Doctoral School on Safety and Security Sciences, Obuda University, Budapest, Hungary
| | - Julien Steven Baker
- Centre for Health and Exercise Science Research, Department of Sport, Physical Education and Health, Hong Kong Baptist University, Hong Kong, China
| | - Yaodong Gu
- Faculty of Sports Science, Ningbo University, Ningbo, China
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8
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Stäudle B, Seynnes O, Laps G, Brüggemann GP, Albracht K. Altered Gastrocnemius Contractile Behavior in Former Achilles Tendon Rupture Patients During Walking. Front Physiol 2022; 13:792576. [PMID: 35299659 PMCID: PMC8921480 DOI: 10.3389/fphys.2022.792576] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2021] [Accepted: 02/01/2022] [Indexed: 11/17/2022] Open
Abstract
Achilles tendon rupture (ATR) remains associated with functional limitations years after injury. Architectural remodeling of the gastrocnemius medialis (GM) muscle is typically observed in the affected leg and may compensate force deficits caused by a longer tendon. Yet patients seem to retain functional limitations during-low-force-walking gait. To explore the potential limits imposed by the remodeled GM muscle-tendon unit (MTU) on walking gait, we examined the contractile behavior of muscle fascicles during the stance phase. In a cross-sectional design, we studied nine former patients (males; age: 45 ± 9 years; height: 180 ± 7 cm; weight: 83 ± 6 kg) with a history of complete unilateral ATR, approximately 4 years post-surgery. Using ultrasonography, GM tendon morphology, muscle architecture at rest, and fascicular behavior were assessed during walking at 1.5 m⋅s-1 on a treadmill. Walking patterns were recorded with a motion capture system. The unaffected leg served as control. Lower limbs kinematics were largely similar between legs during walking. Typical features of ATR-related MTU remodeling were observed during the stance sub-phases corresponding to series elastic element (SEE) lengthening (energy storage) and SEE shortening (energy release), with shorter GM fascicles (36 and 36%, respectively) and greater pennation angles (8° and 12°, respectively). However, relative to the optimal fascicle length for force production, fascicles operated at comparable length in both legs. Similarly, when expressed relative to optimal fascicle length, fascicle contraction velocity was not different between sides, except at the time-point of peak series elastic element (SEE) length, where it was 39 ± 49% lower in the affected leg. Concomitantly, fascicles rotation during contraction was greater in the affected leg during the whole stance-phase, and architectural gear ratios (AGR) was larger during SEE lengthening. Under the present testing conditions, former ATR patients had recovered a relatively symmetrical walking gait pattern. Differences in seen AGR seem to accommodate the profound changes in MTU architecture, limiting the required fascicle shortening velocity. Overall, the contractile behavior of the GM fascicles does not restrict length- or velocity-dependent force potentials during this locomotor task.
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Affiliation(s)
- Benjamin Stäudle
- Faculty of Medical Engineering and Technomathematics, Aachen University of Applied Sciences, Aachen, Germany
- Institute of Movement and Neurosciences, German Sport University Cologne, Cologne, Germany
| | - Olivier Seynnes
- Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, Norway
| | - Guido Laps
- Orthopädie am Gürzenich, Cologne, Germany
| | - Gert-Peter Brüggemann
- Institute of Biomechanics and Orthopedics, German Sport University Cologne, Cologne, Germany
| | - Kirsten Albracht
- Faculty of Medical Engineering and Technomathematics, Aachen University of Applied Sciences, Aachen, Germany
- Institute of Movement and Neurosciences, German Sport University Cologne, Cologne, Germany
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9
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Khair RM, Stenroth L, Cronin NJ, Reito A, Paloneva J, Finni T. Muscle-tendon morphomechanical properties of non-surgically treated Achilles tendon 1-year post-rupture. Clin Biomech (Bristol, Avon) 2022; 92:105568. [PMID: 35066440 DOI: 10.1016/j.clinbiomech.2021.105568] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 10/12/2021] [Accepted: 12/30/2021] [Indexed: 02/07/2023]
Abstract
BACKGROUND Achilles tendon rupture appears to alter stiffness and length of the tendon. These alterations may affect the function of tendon in force transmission and in energy storage and recovery. We studied the mechanical properties of the Achilles' tendon post-rupture and their association with function. METHODS Twenty-four (20 males, 4 females) participants (mean age: 43 y, 176 cm, 81 kg) were recruited. Ultrasonography and dynamometry were used to assess the muscle-tendon unit morphological and mechanical properties of non-surgically treated patients 1-year post rupture. FINDINGS Injured tendons were longer with difference of 1.8 cm (95%CI: 0.5-1.9 cm; P < 0.001), and thicker by 0.2 mm (0.2-0.3 mm; P < 0.01). Medial gastrocnemius cross-sectional area was 1.0 cm2 smaller (0.8-1.1 cm2; P < 0.001), fascicles were 0.6 cm shorter (0.5-0.7 cm; P < 0.001) and pennation angle was 2.5° higher (1.3-3.6°; P < 0.001) when compared to the uninjured limb. We found no differences between injured and uninjured tendon stiffness 1-year post-rupture (mean difference: 29.8 N/mm, -7.7-67.3 N/mm; P = 0.170). The injured tendon showed 1.8 mm (1.2-2.4 mm; P < 0.01) lower elongation during maximal voluntary isometric contractions. Patient-reported functional outcome was related to the tendon resting length (β = 0.68, r(10) = 4.079, P = 0.002). Inter-limb differences in the medial gastrocnemius fascicle length were related to inter-limb differences in maximum contractions (β = 1.17, r(14) = 2.808, P = 0.014). INTERPRETATION Longer Achilles tendon resting length was associated with poorer self-evaluated functional outcome. Although the stiffness of non-surgically treated and uninjured tendons was similar 1-year post rupture, plantar flexion strength deficit was still present, possibly due to shorter medial gastrocnemius fascicle length.
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Affiliation(s)
- Ra'ad M Khair
- Faculty of Sport and Health Sciences, Neuromuscular Research Center, University of Jyväskylä, Jyväskylä, Finland.
| | - Lauri Stenroth
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland
| | - Neil J Cronin
- Faculty of Sport and Health Sciences, Neuromuscular Research Center, University of Jyväskylä, Jyväskylä, Finland; School of Sport & Exercise, University of Gloucestershire, UK
| | | | - Juha Paloneva
- Department of Applied Physics, University of Eastern Finland, Kuopio, Finland; Central Finland Health Care District, Finland
| | - Taija Finni
- Faculty of Sport and Health Sciences, Neuromuscular Research Center, University of Jyväskylä, Jyväskylä, Finland
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10
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Wenning M, Mauch M, Heitner A, Streicher P, Ritzmann R, Paul J. Midterm functional performance following open surgical repair of acute Achilles tendon rupture. Arch Orthop Trauma Surg 2022; 142:1337-1349. [PMID: 33484315 PMCID: PMC9217896 DOI: 10.1007/s00402-020-03746-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 12/19/2020] [Indexed: 12/02/2022]
Abstract
INTRODUCTION Various impairments such as soleus atrophy and consecutive functional deficits in end-range plantarflexion have been described in surgical repair of acute Achilles tendon rupture. The aim of this study was to assess the functional performance at midterm following open surgical repair. MATERIALS AND METHODS This cross-sectional study includes n = 52 patients which were tested on average 3.5 ± 1.4 years postoperatively using three different functional performance tests and patient-reported outcome measures. Two different surgical techniques (anatomical repair = AR vs. conventional repair = CR) were compared in a subanalysis. The testing included isokinetic strength testing, a novel setup of heel-rise testing using a marker-based 3D motion analysis system and a gait analysis. RESULTS At an average 3.5 years post-surgery, there is a persisting deficit in plantarflexion strength of 10.2%. Moreover, analysis of maximum peak torque angle and strength deficits according to the plantarflexion angle revealed that these deficits are not equally distributed across the range of motion. AR results in a significantly smaller deficit at 10° of plantarflexion compared to CR (13.9 vs. 29.9%, p < 0.05). This reflects into the functional performance during different modalities (static vs. dynamic) in this novel method of heel-rise testing. CONCLUSION In summary, there are persisting functional deficits at > 3 years following Achilles tendon repair which range from strength deficits to specific impairments of functional performance e.g. during heel rise. Anatomical reconstruction is associated with an improved functional performance potentially due to a more symmetric strength during end-range plantarflexion which transfers into a higher satisfaction during athletic activities. LEVEL OF EVIDENCE III, retrospective cohort study.
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Affiliation(s)
- Markus Wenning
- Rennbahnklinik, Kriegackerstr. 100, CH-4132, Muttenz, Baselland, Switzerland
- Department of Orthopedic and Trauma Surgery, University Medical Center Freiburg, Faculty of Medicine, Albert-Ludwigs University of Freiburg, Hugstetter Str. 55, 79106, Freiburg, Germany
| | - Marlene Mauch
- Rennbahnklinik, Kriegackerstr. 100, CH-4132, Muttenz, Baselland, Switzerland
| | - Albrecht Heitner
- Rennbahnklinik, Kriegackerstr. 100, CH-4132, Muttenz, Baselland, Switzerland
| | - Paul Streicher
- Department of Sport and Sport Science, University of Freiburg, Freiburg, Germany
| | - Ramona Ritzmann
- Rennbahnklinik, Kriegackerstr. 100, CH-4132, Muttenz, Baselland, Switzerland
| | - Jochen Paul
- Rennbahnklinik, Kriegackerstr. 100, CH-4132, Muttenz, Baselland, Switzerland.
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Sommer B, Hollenstein A, Graf E. Stability boots for the treatment of Achilles tendon injuries: Gait analysis of healthy participants. Gait Posture 2022; 91:131-136. [PMID: 34689070 DOI: 10.1016/j.gaitpost.2021.10.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 10/05/2021] [Accepted: 10/07/2021] [Indexed: 02/02/2023]
Abstract
BACKGROUND Achilles tendon injuries are commonly treated with stability boots that secure the ankle at a specific position and aim to reduce loading of the tendon. These boots allow full weight bearing by limiting the range of movement. It is, however, unknown, to what extent these boots can reduce tendon loading and if the biomechanics are altered during walking. RESEARCH QUESTION How do orthopedic boots influence lower extremity biomechanics during walking? METHODS For this cross-sectional study, ten healthy participants walked with three orthopedic boots (Oped Vacoped, Kuenzli Ortho Rehab Absolut, Orthotech Variostabil) commonly used to treat Achilles tendon injuries. Kinematics and kinetics of the lower extremity of the booted leg and spatiotemporal parameters of both sides were collected using motion-capturing system and dynamometry. Each boot was tested in the maximally plantarflexed position. Group differences between boot conditions were analyzed by means of repeated-measures ANOVA and post-hoc paired t-test. RESULTS The boot dorsiflexion range of motion differed significantly between boots with Vacoped (1.8° (0.3)) showing the smallest range, followed by Kuenzli (5.0° (1.3)) and Orthotech (7.9° (1.7)). Orthotech displayed a higher peak plantarflexion moment (1.36 Nm/kg (0.09)) than both Kuenzli (1.06 Nm/kg (0.12)) and Vacoped (1.04 Nm/kg (0.14)). Concerning loading over time, significant differences in the plantarflexion impulse were found, with the highest impulse in Vacoped (0.42 Nms/kg (0.06)), followed by Orthotech (0.29 Nms/kg (0.03)) and Kuenzli (0.25 Nms/kg (0.05)). In addition, asymmetries were seen in stance and step length for the booted and contralateral sides. SIGNIFICANCE The lower extremity biomechanics were affected by the boots, with Kuenzli showing the lowest joint loading, Vacoped the smallest joint motion and Orthotech the most natural gait pattern. Future research is needed to determine the most relevant variable expressing the risk of re-rupture of the Achilles tendon in order to conclude which boot may be most favorable to use in clinical practice.
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Affiliation(s)
- Bettina Sommer
- Zurich University of Applied Sciences, School of Health Professions, Institute of Physiotherapy, Katharina-Sulzer-Platz 9, 8401 Winterthur, Switzerland
| | - Andreas Hollenstein
- Zurich University of Applied Sciences, School of Health Professions, Institute of Physiotherapy, Katharina-Sulzer-Platz 9, 8401 Winterthur, Switzerland
| | - Eveline Graf
- Zurich University of Applied Sciences, School of Health Professions, Institute of Physiotherapy, Katharina-Sulzer-Platz 9, 8401 Winterthur, Switzerland.
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Stäudle B, Seynnes O, Laps G, Göll F, Brüggemann GP, Albracht K. Recovery from Achilles Tendon Repair: A Combination of Postsurgery Outcomes and Insufficient Remodeling of Muscle and Tendon. Med Sci Sports Exerc 2021; 53:1356-1366. [PMID: 33433154 DOI: 10.1249/mss.0000000000002592] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
INTRODUCTION Achilles tendon rupture (ATR) patients have persistent functional deficits in the triceps surae muscle-tendon unit (MTU). The complex remodeling of the MTU accompanying these deficits remains poorly understood. The purpose of the present study was to associate in vivo and in silico data to investigate the relations between changes in MTU properties and strength deficits in ATR patients. METHODS Eleven male subjects who had undergone surgical repair of complete unilateral ATR were examined 4.6 ± 2.0 (mean ± SD) yr after rupture. Gastrocnemius medialis (GM) tendon stiffness, morphology, and muscle architecture were determined using ultrasonography. The force-length relation of the plantar flexor muscles was assessed at five ankle joint angles. In addition, simulations (OpenSim) of the GM MTU force-length properties were performed with various iterations of MTU properties found between the unaffected and the affected side. RESULTS The affected side of the patients displayed a longer, larger, and stiffer GM tendon (13% ± 10%, 105% ± 28%, and 54% ± 24%, respectively) compared with the unaffected side. The GM muscle fascicles of the affected side were shorter (32% ± 12%) and with greater pennation angles (31% ± 26%). A mean deficit in plantarflexion moment of 31% ± 10% was measured. Simulations indicate that pairing an intact muscle with a longer tendon shifts the optimal angular range of peak force outside physiological angular ranges, whereas the shorter muscle fascicles and tendon stiffening seen in the affected side decrease this shift, albeit incompletely. CONCLUSIONS These results suggest that the substantial changes in MTU properties found in ATR patients may partly result from compensatory remodeling, although this process appears insufficient to fully restore muscle function.
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Affiliation(s)
| | - Olivier Seynnes
- Department of Physical Performance, Norwegian School of Sport Sciences, Oslo, NORWAY
| | - Guido Laps
- Orthopaedie am Guerzenich, Cologne, GERMANY
| | - Fabian Göll
- Institute of Movement and Neurosciences, German Sport University Cologne, Cologne, GERMANY
| | - Gert-Peter Brüggemann
- Institute of Biomechanics and Orthopaedics, German Sport University Cologne, Cologne, GERMANY
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Zellers JA, Baxter JR, Silbernagel KG. Functional Ankle Range of Motion but Not Peak Achilles Tendon Force Diminished With Heel-Rise and Jumping Tasks After Achilles Tendon Repair. Am J Sports Med 2021; 49:2439-2446. [PMID: 34115525 PMCID: PMC8282709 DOI: 10.1177/03635465211019436] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Deficits in sporting performance after Achilles tendon repair may be due to changes in musculotendinous unit structure, including tendon elongation and muscle fascicle shortening. PURPOSE/HYPOTHESIS The purpose was to discern whether Achilles tendon rupture reduces triceps surae muscle force generation, alters functional ankle range of motion, or both during sports-related tasks. We hypothesized that individuals who have undergone Achilles tendon repair lack the functional ankle range of motion needed to complete sports-related tasks. STUDY DESIGN Descriptive laboratory study. METHODS The study included individuals 1 to 3 years after treatment of Achilles tendon rupture with open repair. Participants (n = 11) completed a heel-rise task and 3 jumping tasks. Lower extremity biomechanics were analyzed using motion capture. Between-limb differences were tested using paired t test. RESULTS Pelvic vertical displacement was reduced during the heel-rise (mean difference, -12.8%; P = .026) but not during the jumping task (P > .1). In the concentric phase of all tasks, peak ankle plantarflexion angle (range of mean difference, -19.2% to -48.8%; P < .05) and total plantar flexor work (defined as the area under the plantar flexor torque - ankle angle curve) (range of mean difference, -9.5% to -25.7%; P < .05) were lower on the repaired side relative to the uninjured side. No significant differences were seen in peak Achilles tendon load or impulse with any of the tasks. There were no differences in plantar flexor work or Achilles tendon load parameters during eccentric phases. CONCLUSION Impaired task performance or increased demands on proximal joints were observed on the repaired side in tasks isolating ankle function. Tasks that did not isolate ankle function appeared to be well recovered, although functional ankle range of motion was reduced with rupture. Reduced plantar flexor muscle-tendon unit work supports previous reports that an elongated tendon and shorter muscle fascicles caused by Achilles tendon rupture constrain functional capacity. Achilles tendon peak load and impulse were not decreased, suggesting that reduced and shifted functional ankle range of motion (favoring dorsiflexion) underlies performance deficits. CLINICAL RELEVANCE These findings point to the need to reduce tendon elongation and restore muscle length of the triceps surae after Achilles tendon rupture in order to address musculature that is short but not necessarily weak for improved performance with sports-related activities.
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Affiliation(s)
- Jennifer A. Zellers
- Program in Physical Therapy, Washington University School of Medicine in St. Louis, St. Louis, MO
| | - Josh R. Baxter
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA
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Wang T, Mu Y, Diao Y, Liu W, Wu Y, Wang Z, Luo Y, Xie Y, Yin L. Biomechanical Comparison of Panda Rope Bridge Technique and Other Minimally Invasive Achilles Tendon Repair Techniques In Vitro. Orthop J Sports Med 2021; 9:23259671211008436. [PMID: 34179202 PMCID: PMC8202294 DOI: 10.1177/23259671211008436] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Accepted: 01/03/2021] [Indexed: 11/15/2022] Open
Abstract
Background: Although nonoperative management of acute Achilles tendon rupture (ATR) is a reasonable option, surgical repair has attracted attention for young and active patients. More reliable Achilles tendon repair techniques are needed to enhance recovery after ATR in this population. Purpose/Hypothesis: To biomechanically analyze the panda rope bridge technique (PRBT) and compare it with other minimally invasive repair techniques over a simulated, progressive rehabilitation program. It was hypothesized that PRBT would result in better biomechanical properties and enhanced recovery after ATR. Study Design: Controlled laboratory study. Methods: An Achilles tendon rupture was created 4 cm from the distal tendon insertion site in 40 bovine lower extremities, and specimens were then randomly allocated to 5 Achilles tendon repair techniques: (1) Achillon, (2) modified Achillon, (3) Percutaneous Achilles Repair System (PARS), (4) modified PARS, and (5) PRBT. Each group was subjected to a cyclic loading protocol that was representative of progressive postoperative rehabilitation for ATR (250 cycles at 1 Hz for each loading stage: 20-100 N, 20-200 N, 20-300 N, and 20-400 N). Results: The PRBT technique demonstrated significantly less elongation (1.62 ± 0.25 mm) than the 4 other repair techniques after the first loading stage of 20 to 100 N (P < .05). All specimens in the 4 other groups developed a large gap (elongation ≥5 mm) at the 20- to 200-N loading stage. When overall biomechanical performance was examined, the PRBT group exhibited higher strength (20-400 N) and more mean loading cycles (984 ± 10) compared with the 4 other groups (P < .05). Conclusion: In this bovine model, PRBT biomechanically outperformed the other minimally invasive Achilles tendon repair techniques that were tested and could therefore meet the requirements of accelerated rehabilitation. Clinical Relevance: The reduced tendency for premature rerupture and the overall improved biomechanical properties of PRBT suggest that ATR patients treated with PRBT may more readily complete early and aggressive postoperative rehabilitation protocols. In addition, they may have a lower risk of early irreversible suture failure.
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Affiliation(s)
- Ting Wang
- Department of Orthopaedics, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yuan Mu
- Department of Orthopaedics, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yulei Diao
- Department of Orthopaedics, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Wenke Liu
- Department of Orthopaedics, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yahong Wu
- Department of Orthopaedics, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Zhuoqun Wang
- Department of Orthopaedics, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
| | - Yanfeng Luo
- Bioengineering College, Chongqing University, Chongqing, China
| | - Yangli Xie
- State Key Laboratory of Trauma, Burns and Combined Injury, Army Medical University, Chongqing, China
| | - Liangjun Yin
- Department of Orthopaedics, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, China
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15
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Diniz P, Pacheco J, Fernandes RM, Pereira H, Castelo Ferreira F, Kerkhoffs GMMJ. Modified triple Kessler with least risk of elongation among Achilles tendon repair techniques: a systematic review and network meta-analysis of human cadaveric studies. Knee Surg Sports Traumatol Arthrosc 2021; 31:1644-1657. [PMID: 34089335 DOI: 10.1007/s00167-021-06613-9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Accepted: 05/17/2021] [Indexed: 12/12/2022]
Abstract
PURPOSE Current treatment recommendations emphasize early loading, with preservation of tendon length and physiologic tension. The objective of this systematic review and network meta-analysis was to compare failure load and elongation after cyclic loading of Achilles tendon repair techniques at time-zero. METHODS The databases PubMed, CENTRAL and Web of Science were searched for all published in-vitro studies comparing Achilles tendon repair techniques, or augmentation with autografts/biomaterials, and reports of failure load or elongation after cyclic loading. Only studies using human cadaveric Achilles tendons and matched pairs, or randomized specimen allocation, were selected for quantitative synthesis. A network meta-analysis per primary outcome was performed. Results were summarized as P score rankings and their validity was assessed using statistical methods. RESULTS Sixteen studies, comprising 367 tendon repairs, were included. The following repair techniques were used (n = number of studies): Krackow (n = 8), Achillon (n = 4), double Krackow (n = 3), Bunnell (n = 3), Percutaneous Achilles Repair System (n = 3), Percutaneous Achilles Repair System Midsubstance (n = 2), Kessler (n = 3), double Kessler (n = 1), modified triple Kessler (n = 1), triple bundle (n = 1), a multifilament stainless steel cable-crimp technique (n = 1) and a double loop knot stitch (n = 1). Five studies assessed augmentation with autografts/biomaterials. Regarding the failure load, biomaterial augmented Krackow repairs occupied the first four positions in the ranking, followed by the multifilament stainless steel cable-crimp and Percutaneous Achilles Repair System Midsubstance techniques. Concerning elongation after cyclic loading, the triple Kessler was ranked first, followed by the Achillon and Percutaneous Achilles Repair System Midsubstance techniques. A negligible correlation between ranks was found (rs = 0.11; p = 0.75n.s.), meaning that a higher repair tensile strength is not necessarily related to improved performance in regard to avoidance of elongation. CONCLUSION In the failure load network meta-analysis, biomaterial augmented Krackow repairs ranked highest, but noticeable statistical heterogeneity was found. Regarding elongation with cyclic loading, the modified triple Kessler stitch showed the highest probability of ranking first. LEVEL OF EVIDENCE Level IV.
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Affiliation(s)
- Pedro Diniz
- Department of Orthopaedic Surgery, Hospital de Sant'Ana, Rua de Benguela 501, 2775-028, Parede, Portugal.
- Department of Bioengineering, iBB - Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal.
- , Fisiogaspar, Lisboa, Portugal.
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal.
| | - Jácome Pacheco
- Department of Orthopaedic Surgery, Hospital de Sant'Ana, Rua de Benguela 501, 2775-028, Parede, Portugal
| | - Ricardo M Fernandes
- Clinical Pharmacology and Therapeutics, Faculdade de Medicina, Instituto de Medicina Molecular, Universidade de Lisboa, Lisboa, Portugal
| | - Hélder Pereira
- Orthopaedic Department, Centro Hospitalar Póvoa de Varzim, Vila do Conde, Portugal
- Ripoll y De Prado Sports Clinic: FIFA Medical Centre of Excellence, Murcia, Madrid, Spain
- University of Minho ICVS/3B's-PT Government Associate Laboratory, Braga/Guimarães, Portugal
| | - Frederico Castelo Ferreira
- Department of Bioengineering, iBB - Institute for Bioengineering and Biosciences, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049-001, Lisboa, Portugal
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, Instituto Superior Técnico, Universidade de Lisboa, Lisboa, Portugal
| | - Gino M M J Kerkhoffs
- Department of Orthopaedic Surgery, Amsterdam Movement Sciences, Amsterdam University Medical Centers, Amsterdam, The Netherlands
- Academic Center for Evidence Based Sports Medicine (ACES), Amsterdam, The Netherlands
- Amsterdam Collaboration for Health and Safety in Sports (ACHSS), Amsterdam, The Netherlands
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Wenning M, Mauch M, Heitner A, Lienhard J, Ritzmann R, Paul J. Neuromechanical activation of triceps surae muscle remains altered at 3.5 years following open surgical repair of acute Achilles tendon rupture. Knee Surg Sports Traumatol Arthrosc 2021; 29:2517-2527. [PMID: 33660053 PMCID: PMC8298360 DOI: 10.1007/s00167-021-06512-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 02/17/2021] [Indexed: 11/26/2022]
Abstract
PURPOSE To assess whether the neuromuscular activation pattern following Achilles tendon rupture and repair may contributes to the observable functional deficits in this severe and increasingly frequent injury. METHODS In this study, the neuromuscular activation using surface EMG of n = 52 patients was assessed during a battery of functional performance tasks to assess potential alterations of muscular activation and recruitment. We analyzed the injured leg vs. the contralateral healthy leg at a mean of 3.5 years following open surgical repair. The testing battery included isokinetic strength testing, bipedal and single-legged heel-rise testing as well as gait analysis. RESULTS During isokinetic testing, we observed a higher activation integral for all triceps surae muscles of the injured side during active dorsiflexion, e.g., eccentric loading on the injured leg, while concentric plantarflexion showed no significant difference. Dynamic heel-rise testing showed a higher activation in concentric and eccentric loading for all posterior muscles on the injured side (not significant); while static heel-rise for 10 sec. revealed a significantly higher activation. Further analysis of frequency of fast Fourier-transformed EMG revealed a significantly higher median frequency in the injured leg. Gait analysis revealed a higher pre-activation of the tibialis anterior before ground contact, while medial and lateral gastrocnemius muscles of the injured leg showed a significantly higher activation during push-off phase. CONCLUSIONS The results of this study provide evidence on the neuromuscular changes 3.5 years following open surgical Achilles tendon repair. These complex neuromuscular changes are manifested to produce the maximum force output whilst protecting the previously injured tendon. The observed alterations may be related to an increased recruitment of type II muscle fibers which could make the muscles prone to fatigue. LEVEL OF EVIDENCE III.
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Affiliation(s)
- Markus Wenning
- Rennbahnklinik, Muttenz, Basel, Switzerland.
- Department of Orthopedic and Trauma Surgery, Faculty of Medicine, University Medical Center Freiburg, Albert-Ludwigs University of Freiburg, Freiburg, Germany.
| | | | | | - Johannes Lienhard
- Department of Sport and Sport Science, Biomechanics and Motor Control, Albert-Ludwigs University of Freiburg, Freiburg, Germany
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Karamanidis K, Epro G. Monitoring Muscle-Tendon Adaptation Over Several Years of Athletic Training and Competition in Elite Track and Field Jumpers. Front Physiol 2020; 11:607544. [PMID: 33391022 PMCID: PMC7772406 DOI: 10.3389/fphys.2020.607544] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Accepted: 11/27/2020] [Indexed: 12/20/2022] Open
Abstract
Differences in muscle and tendon responsiveness to mechanical stimuli and time courses of adaptive changes may disrupt the interaction of the musculotendinous unit (MTU), increasing the risk for overuse injuries. We monitored training-induced alterations in muscle and tendon biomechanical properties in elite jumpers over 4 years of athletic training to detect potential non-synchronized adaptations within the triceps surae MTU. A combined cross-sectional and longitudinal investigation over 4 years was conducted by analyzing triceps surae MTU mechanical properties in both legs via dynamometry and ultrasonography in 67 elite track and field jumpers and 24 age-matched controls. Fluctuations in muscle and tendon adaptive changes over time were quantified by calculating individual residuals. The cosine similarity of the relative changes of muscle strength and tendon stiffness between sessions served as a measure of uniformity of adaptive changes. Our cross-sectional study was unable to detect clear non-concurrent differences in muscle strength and tendon stiffness in elite jumpers. However, when considering the longitudinal data over several years of training most of the jumpers demonstrated greater fluctuations in muscle strength and tendon stiffness and hence tendon strain compared to controls, irrespective of training period (preparation vs. competition). Moreover, two monitored athletes with chronic Achilles tendinopathy showed in their affected limb lower uniformity in MTU adaptation as well as higher fluctuations in tendon strain over time. Habitual mechanical loading can affect the MTU uniformity in elite jumpers, leading to increased mechanical demand on the tendon over an athletic season and potentially increased risk for overuse injuries.
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Affiliation(s)
- Kiros Karamanidis
- Sport and Exercise Science Research Centre, School of Applied Sciences, London South Bank University, London, United Kingdom
| | - Gaspar Epro
- Sport and Exercise Science Research Centre, School of Applied Sciences, London South Bank University, London, United Kingdom
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Achilles tendon elongation after acute rupture: is it a problem? A systematic review. Knee Surg Sports Traumatol Arthrosc 2020; 28:4011-4030. [PMID: 32363475 DOI: 10.1007/s00167-020-06010-8] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/05/2020] [Accepted: 04/16/2020] [Indexed: 12/11/2022]
Abstract
PURPOSE Rupture of the Achilles tendon (AT) is a common injury. Strength deficits may persist over the long term, possibly owing to elongation of the tendon or inferior mechanical properties. This study aimed to provide a systematic review of the literature on the prevalence and consequences of tendon elongation in patients after acute AT rupture treatment. It was hypothesized that an elongated tendon would be associated with a worse clinical outcome. METHODS The databases for MEDLINE, CENTRAL and Web of Science were searched. Clinical studies related to AT rupture reporting tendon elongation and clinical or functional outcomes, with a minimum follow-up of 6 months, were eligible for inclusion. Only studies testing for statistical correlations (SCs) between AT elongation and other outcomes were eligible, with the exception of biomechanical studies in which statistically significant AT elongation was found to be a generalized finding in the study group. For these studies to be eligible, the study group had to be compared with a healthy control group, or the injured limb compared with the uninjured limb, regarding biomechanical parameters. RESULTS Twenty-eight papers were selected for inclusion. Mean AT elongation measured with imaging techniques ranged from 0.15 to 3.1 cm (n = 17). Ten studies investigated SCs with Patient Reported Outcome Measures (PROMs), in which two found SCs with tendon elongation. Five studies reported strength and power evaluations and their correlation with AT elongation, with two having found SCs between decreased strength and tendon elongation. In ten studies reporting data on biomechanical tests, nine found influence of tendon elongation. In this group, four out of five studies found SCs with biomechanical parameters. CONCLUSION Fair evidence of the influence of tendon elongation in biomechanical parameters was found. In a general population, evidence of a detrimental effect of tendon elongation on PROMs or functional strength at follow-up was not found in this review. LEVEL OF EVIDENCE Level IV.
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Techniques for In Vivo Measurement of Ligament and Tendon Strain: A Review. Ann Biomed Eng 2020; 49:7-28. [PMID: 33025317 PMCID: PMC7773624 DOI: 10.1007/s10439-020-02635-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 09/22/2020] [Indexed: 12/13/2022]
Abstract
The critical clinical and scientific insights achieved through knowledge of in vivo musculoskeletal soft tissue strains has motivated the development of relevant measurement techniques. This review provides a comprehensive summary of the key findings, limitations, and clinical impacts of these techniques to quantify musculoskeletal soft tissue strains during dynamic movements. Current technologies generally leverage three techniques to quantify in vivo strain patterns, including implantable strain sensors, virtual fibre elongation, and ultrasound. (1) Implantable strain sensors enable direct measurements of tissue strains with high accuracy and minimal artefact, but are highly invasive and current designs are not clinically viable. (2) The virtual fibre elongation method tracks the relative displacement of tissue attachments to measure strains in both deep and superficial tissues. However, the associated imaging techniques often require exposure to radiation, limit the activities that can be performed, and only quantify bone-to-bone tissue strains. (3) Ultrasound methods enable safe and non-invasive imaging of soft tissue deformation. However, ultrasound can only image superficial tissues, and measurements are confounded by out-of-plane tissue motion. Finally, all in vivo strain measurement methods are limited in their ability to establish the slack length of musculoskeletal soft tissue structures. Despite the many challenges and limitations of these measurement techniques, knowledge of in vivo soft tissue strain has led to improved clinical treatments for many musculoskeletal pathologies including anterior cruciate ligament reconstruction, Achilles tendon repair, and total knee replacement. This review provides a comprehensive understanding of these measurement techniques and identifies the key features of in vivo strain measurement that can facilitate innovative personalized sports medicine treatment.
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Hullfish TJ, O'Connor KM, Baxter JR. Instrumented immobilizing boot paradigm quantifies reduced Achilles tendon loading during gait. J Biomech 2020; 109:109925. [PMID: 32807329 DOI: 10.1016/j.jbiomech.2020.109925] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2020] [Revised: 06/09/2020] [Accepted: 06/21/2020] [Indexed: 12/19/2022]
Abstract
Achilles tendon ruptures are common injuries that lead to functional deficits in two-thirds of patients. Progressively loading the healing tendon has been associated with superior outcomes, but the loading profiles that patients experience throughout rehabilitation have not yet been established. In this study, we developed and calibrated an instrumented immobilizing boot paradigm that is aimed at longitudinally quantifying patient loading biomechanics to develop personalized rehabilitation protocols. We used a 3-part instrumented insole to quantify the ankle loads generated by the Achilles tendon and secured a load cell inline with the posterior strut of the immobilizing boot to quantify boot loading. We then collected gait data from five healthy young adults to demonstrate the validity of this instrumented immobilizing boot paradigm to assess Achilles tendon loading during ambulation. We developed a simple calibration procedure to improve the measurement fidelity of the instrumented insole needed to quantify Achilles tendon loading while ambulating with an immobilizing boot. By assessing Achilles tendon loading with the ankle constrained to 0 degrees and 30 degrees plantar flexion, we confirmed that walking with the foot supported in plantar flexion decreased Achilles tendon loading by 60% (P < 0.001). This instrumented immobilizing boot paradigm leverages commercially available sensors and logs data using a small microcontroller secured to the boot and a handheld device, making our paradigm capable of continuously monitoring biomechanical loading outside of the lab or clinic.
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Affiliation(s)
- Todd J Hullfish
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA, USA
| | - Kathryn M O'Connor
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA, USA
| | - Josh R Baxter
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA, USA.
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Agres AN, Arampatzis A, Gehlen T, Manegold S, Duda GN. Muscle Fascicles Exhibit Limited Passive Elongation Throughout the Rehabilitation of Achilles Tendon Rupture After Percutaneous Repair. Front Physiol 2020; 11:746. [PMID: 32792966 PMCID: PMC7385380 DOI: 10.3389/fphys.2020.00746] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 06/08/2020] [Indexed: 12/28/2022] Open
Abstract
Achilles tendon rupture (ATR) results in long-term functional and structural deficits, characterized by reduced ankle mobility and plantarflexor muscle atrophy. However, it remains unclear how such functional impairments develop after surgical repair. While it is known that this injury negatively affects the tendon’s function, to date, limited work has focused on the short-term effect of ATR on the structure of the muscles in series. The aim of this study was to characterize changes in medial gastrocnemius architecture and its response to passive lengthening during the post-surgical rehabilitative period following ATR. Both injured and contralateral limbs from 10 subjects (1 female, BMI: 27.2 ± 3.9 kg/m2; age: 46 ± 10 years) with acute, unilateral ATR were assessed at 8, 12, and 16 weeks after percutaneous surgical repair. To characterize the component tissues of the muscle-tendon unit, resting medial gastrocnemius muscle thickness, fascicle length, and pennation angle were determined from ultrasound images with the ankle in both maximal plantarflexion and dorsiflexion. The ankle range of motion (ROM) was determined using motion capture; combined ultrasound and motion capture determined the relative displacement of the musculotendinous junction (MTJ) of the AT with the medial gastrocnemius. The ATR-injured gastrocnemius muscle consistently exhibited lower thickness, regardless of time point and ankle angle. Maximal ankle plantarflexion angles and corresponding fascicle lengths were lower on the injured ankle compared to the contralateral throughout rehabilitation. When normalized to the overall ankle ROM, both injured fascicles and MTJ displacement exhibited a comparably lower change in length when the ankle was passively rotated. These results indicate that when both ankles are passively exposed to the same ROM following ATR surgery, both ipsilateral Achilles tendon and gastrocnemius muscle fascicles exhibit limited lengthening compared to the contralateral MTU tissues. This appears to be consistent throughout the rehabilitation of gait, suggesting that current post-operative rehabilitative exercises do not appear to induce muscle adaptations in the affected MTU.
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Affiliation(s)
- Alison N Agres
- Julius Wolff Institute, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - Adamantios Arampatzis
- Department of Training and Movement Sciences, Humboldt University of Berlin, Berlin, Germany
| | - Tobias Gehlen
- Center for Musculoskeletal Surgery, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
| | - Sebastian Manegold
- Department for Foot and Ankle Surgery, BG Unfallklinik Frankfurt am Main, Frankfurt am Main, Germany
| | - Georg N Duda
- Julius Wolff Institute, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Berlin, Germany
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22
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Sun D, Fekete G, Baker JS, Mei Q, István B, Zhang Y, Gu Y. A Pilot Study of Musculoskeletal Abnormalities in Patients in Recovery from a Unilateral Rupture-Repaired Achilles Tendon. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17134642. [PMID: 32605170 PMCID: PMC7369810 DOI: 10.3390/ijerph17134642] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2020] [Revised: 06/23/2020] [Accepted: 06/24/2020] [Indexed: 11/16/2022]
Abstract
The purpose of this study was to compare the inter-limb joint kinematics, joint moments, muscle forces, and joint reaction forces in patients after an Achilles tendon rupture (ATR) via subject-specific musculoskeletal modeling. Six patients recovering from a surgically repaired unilateral ATR were included in this study. The bilateral Achilles tendon (AT) lengths were evaluated using ultrasound imaging. The three-dimensional marker trajectories, ground reaction forces, and surface electromyography (sEMG) were collected on both sides during self-selected speed during walking, jogging and running. Subject-specific musculoskeletal models were developed to compute joint kinematics, joint moments, muscle forces and joint reaction forces. AT lengths were significantly longer in the involved side. The side-to-side triceps surae muscle strength deficits were combined with decreased plantarflexion angles and moments in the injured leg during walking, jogging and running. However, the increased knee extensor femur muscle forces were associated with greater knee extension degrees and moments in the involved limb during all tasks. Greater knee joint moments and joint reaction forces versus decreased ankle joint moments and joint reaction forces in the involved side indicate elevated knee joint loads compared with reduced ankle joint loads that are present during normal activities after an ATR. In the frontal plane, increased subtalar eversion angles and eversion moments in the involved side were demonstrated only during jogging and running, which were regarded as an indicator for greater medial knee joint loading. It seems after an ATR, the elongated AT accompanied by decreased plantarflexion degrees and calf muscle strength deficits indicates ankle joint function impairment in the injured leg. In addition, increased knee extensor muscle strength and knee joint loads may be a possible compensatory mechanism for decreased ankle function. These data suggest patients after an ATR may suffer from increased knee overuse injury risk.
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Affiliation(s)
- Dong Sun
- Faculty of Sports Science, Ningbo University, Ningbo 315211, China; (D.S.); (Q.M.); (Y.Z.)
| | - Gusztáv Fekete
- Savaria Institute of Technology, Eötvös Loránd University, 9700 Szombathely, Hungary;
| | - Julien S. Baker
- Department of Sport and Physical Education, Hong Kong Baptist University, Hong Kong 999077, China;
| | - Qichang Mei
- Faculty of Sports Science, Ningbo University, Ningbo 315211, China; (D.S.); (Q.M.); (Y.Z.)
| | - Bíró István
- Department of Technology, Faculty of Engineering, University of Szeged, 6727 Szeged, Hungary;
| | - Yan Zhang
- Faculty of Sports Science, Ningbo University, Ningbo 315211, China; (D.S.); (Q.M.); (Y.Z.)
| | - Yaodong Gu
- Faculty of Sports Science, Ningbo University, Ningbo 315211, China; (D.S.); (Q.M.); (Y.Z.)
- Correspondence: ; Tel.: +86-574-87600208
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Lo Torto F, Kaciulyte J, Marcasciano M, Casella D, Bernetti A, Mangone M, Agostini F, Ciudad P, Fioramonti P, Ruggiero M, Ribuffo D, Carlesimo B. Peroneus Brevis flap in Achilles tendon reconstruction. Clinical, radiological and functional analysis. Foot Ankle Surg 2020; 26:218-223. [PMID: 30837207 DOI: 10.1016/j.fas.2019.02.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 02/01/2019] [Accepted: 02/15/2019] [Indexed: 02/04/2023]
Abstract
BACKGROUND We would like to describe our experience with Peroneus Brevis flap in complicated Achilles tendon re-ruptures with fringed stumps. METHODS Eight patients with monolateral re-rupture of Achilles tendon were selected as eligible for surgical repair with Peroneus Brevis flap. Patients' outcome was evaluated clinically (ATRS and ROM), functionally (Gait analysis) and MRI was performed before and after surgery. RESULTS Effective coverage of tissue defect was reached in all patients. Functional assessment evaluation results were registered in a follow-up time that ranged from 12 to 18 months. ATRS and ROM tests' results showed good functional recovery without functional limitations or subjective reports pain. Post-operative MRI showed no signs of inflammation or tissue gaps. Gait analysis showed a partial reduction of performance in the affected side that did not affect patients' quality of life. CONCLUSIONS In the presence of fringed stumps in Achilles tendon re-rupture, tendon flaps have the benefits of autologous tissues transfers and present less risks of failure than free flaps. Among them, Peroneus Brevis flap is easy to perform and leads to donor site's low morbidity. Our preliminary experience provides support for this technique to be potentially validated in larger more controlled trial.
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Affiliation(s)
- Federico Lo Torto
- Sapienza Università di Roma, Policlinico Umberto I, Department of Surgery "P. Valdoni", Unit of Plastic Reconstructive and Aesthetic Surgery, Rome, Italy
| | - Juste Kaciulyte
- Sapienza Università di Roma, Policlinico Umberto I, Department of Surgery "P. Valdoni", Unit of Plastic Reconstructive and Aesthetic Surgery, Rome, Italy.
| | - Marco Marcasciano
- Sapienza Università di Roma, Policlinico Umberto I, Department of Surgery "P. Valdoni", Unit of Plastic Reconstructive and Aesthetic Surgery, Rome, Italy
| | - Donato Casella
- Department of Oncologic and Reconstructive Breast Surgery, "Breast Unit Integrata di Livorno, Cecina, Piombino, Elba, Azienda USL Toscana nord ovest", Italy
| | - Andrea Bernetti
- Sapienza Università di Roma, Policlinico Umberto I, Department of Physical Medicine and Rehabilitation, Rome, Italy
| | - Massimiliano Mangone
- Sapienza Università di Roma, Policlinico Umberto I, Department of Physical Medicine and Rehabilitation, Rome, Italy
| | - Francesco Agostini
- Sapienza Università di Roma, Policlinico Umberto I, Department of Physical Medicine and Rehabilitation, Rome, Italy
| | - Pedro Ciudad
- Department of Plastic Surgery, China Medical University Hospital, Taichung, Taiwan
| | - Paolo Fioramonti
- Sapienza Università di Roma, Policlinico Umberto I, Department of Surgery "P. Valdoni", Unit of Plastic Reconstructive and Aesthetic Surgery, Rome, Italy
| | - Marco Ruggiero
- Policlinico Luigi Di Liegro, Via dei Badoer, Rome, Italy
| | - Diego Ribuffo
- Sapienza Università di Roma, Policlinico Umberto I, Department of Surgery "P. Valdoni", Unit of Plastic Reconstructive and Aesthetic Surgery, Rome, Italy
| | - Bruno Carlesimo
- Department of Plastic Surgery, Clinica Mater Dei, Rome, Italy
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Zellers JA, Cortes DH, Pohlig RT, Silbernagel KG. Tendon morphology and mechanical properties assessed by ultrasound show change early in recovery and potential prognostic ability for 6-month outcomes. Knee Surg Sports Traumatol Arthrosc 2019; 27:2831-2839. [PMID: 30415387 PMCID: PMC6510650 DOI: 10.1007/s00167-018-5277-8] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Accepted: 10/29/2018] [Indexed: 11/25/2022]
Abstract
PURPOSE Optimizing tendon structural recovery during the first 12 weeks after Achilles tendon rupture is a prime target to improve patient outcomes, but a comprehensive understanding of biomarkers is needed to track early healing. The purpose of this study was to observe healing of tendon structure over time using ultrasound-based, tendon-specific measures and to identify relationships between tendon structural characteristics and clinical measures of gait and strength. METHODS Twenty-seven participants (21 males, mean (SD) age 39 (11) years) were assessed at 4, 8, 12, and 24 weeks after injury or surgery using ultrasound imaging techniques. Gait analysis and strength testing were added at the later time points. RESULTS Ruptured tendons had significantly lower dynamic shear modulus (p < 0.001), greater tendon cross-sectional area (p < 0.001), and greater length (p < 0.001) than the uninjured side. Dynamic shear modulus, cross-sectional area, and length were found to increase over time (p < 0.01). Tendon structure at 4 weeks post-injury [cross-sectional area symmetry (r = 0.737, p = 0.002) and dynamic shear modulus (r = 0.518, p = 0.040)] related to stance phase walking symmetry at 24 weeks. CONCLUSIONS Tendon structure assessed by ultrasound imaging changes over the first 24 weeks of healing after Achilles tendon rupture, suggesting it could be used as a biomarker to track tendon healing early in recovery. Additionally, tendon structure within the first 12 weeks relates to later walking gait and heel-rise symmetry, which may indicate that tendon structure could have prognostic value in the care of these patients. This study's clinical relevance is in its support for using ultrasound imaging to assess early patient healing and prognosticate later patient outcomes after Achilles tendon rupture. LEVEL OF EVIDENCE Level 2, prospective cohort prognostic study.
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Affiliation(s)
- Jennifer A Zellers
- Department of Physical Therapy, University of Delaware, 540 South College Ave, Newark, DE, 19713, USA
| | - Daniel H Cortes
- Department of Mechanical and Nuclear Engineering, Penn State University, State College, PA, USA
| | - Ryan T Pohlig
- College of Health Sciences Biostatistics Core Facility, University of Delaware, Newark, DE, USA
| | - Karin Grävare Silbernagel
- Department of Physical Therapy, University of Delaware, 540 South College Ave, Newark, DE, 19713, USA.
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25
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Speedtsberg MB, Kastoft R, Barfod KW, Penny JØ, Bencke J. Gait Function and Postural Control 4.5 Years After Nonoperative Dynamic Treatment of Acute Achilles Tendon Ruptures. Orthop J Sports Med 2019; 7:2325967119854324. [PMID: 31276005 PMCID: PMC6598330 DOI: 10.1177/2325967119854324] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Background: An Achilles tendon rupture (ATR) is known to cause persistent biomechanical deficits such as decreased muscle strength in end-range plantar flexion and reduced tendon stiffness. Purpose/Hypothesis: This study aimed to examine whether sustained asymmetries were present in dynamic stiffness and kinematic and kinetic variables in gait and single-leg balance at 4.5-year follow-up in conservatively treated patients recovering from an ATR. We hypothesized that patients who had recovered from ATRs exhibit a midterm increase in peak ankle dorsiflexion, a decrease in concentric work, and decreased dynamic stiffness during the stance phase of gait, along with increased single-leg standing sway in the injured leg compared with the uninjured leg. Study Design: Case series; Level of evidence, 4. Methods: This study was a cross-sectional medium-term follow-up of conservatively treated patients recovering from ATRs. A total of 34 patients who underwent nonoperative treatment were included for testing 4.5 years after a rupture. The Achilles tendon length was measured using ultrasound. Standard instrumented 3-dimensional (3D) gait analysis and single-leg standing balance were performed using 3D motion capture. Kinematic and kinetic ankle parameters were calculated during gait, and quasi-stiffness was calculated as the moment change per the change in the degree of dorsiflexion during the second (ankle) rocker of the gait cycle. Center of pressure displacement (sway length), along with rambling and trembling, was calculated for the single-leg balance task. Results: Peak dorsiflexion in stance was 13.4% larger in the injured leg than the uninjured leg (16.9° ± 3.1° vs 14.9° ± 0.4°, respectively; P ≤ .001). Peak dorsiflexion was not associated with the normalized Achilles tendon length (B = 0.052; P = .775). Total positive work in the plantar flexors was 23.9% greater in the uninjured leg than the injured leg (4.71 ± 1.60 vs 3.80 ± 0.79 J/kg, respectively; P = .001). Quasi-stiffness was greater in the uninjured leg than the injured leg during the initial (0.053 ± 0.022 vs 0.046 ± 0.020 N·m/kg/deg, respectively; P = .009) and late (0.162 ± 0.110 vs 0.139 ± 0.041 N·m/kg/deg, respectively; P = .005) phases of eccentric loading. No difference was found in sway length during single-leg stance between the injured and uninjured legs (1.45 ± 0.4 vs 1.44 ± 0.4 m, respectively; P = .955). Conclusion: Patients treated conservatively have a small increase in peak dorsiflexion, decreased total concentric plantar flexor power, and decreased quasi-stiffness in initial and end-range dorsiflexion in the injured leg. These deviations could not be directly associated with the measured tendon elongation. Registration: NCT02760784 (ClinicalTrials.gov).
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Affiliation(s)
- Merete B Speedtsberg
- Human Movement Analysis Laboratory, Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
| | - Rasmus Kastoft
- Clinical Orthopaedic Research Hvidovre, Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
| | - Kristoffer W Barfod
- Clinical Orthopaedic Research Hvidovre, Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark.,Sports Orthopaedic Research CenterCopenhagen, Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
| | - Jeanette Ø Penny
- Clinical Orthopaedic Research Hvidovre, Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark.,Section of Foot and Ankle Orthopaedics, Department of Orthopaedic Surgery, Zealand University Hospital, Kge, Denmark
| | - Jesper Bencke
- Human Movement Analysis Laboratory, Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre, Hvidovre, Denmark
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Freedman BR, Mooney DJ. Biomaterials to Mimic and Heal Connective Tissues. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2019; 31:e1806695. [PMID: 30908806 PMCID: PMC6504615 DOI: 10.1002/adma.201806695] [Citation(s) in RCA: 107] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2018] [Revised: 01/27/2019] [Indexed: 05/11/2023]
Abstract
Connective tissue is one of the four major types of animal tissue and plays essential roles throughout the human body. Genetic factors, aging, and trauma all contribute to connective tissue dysfunction and motivate the need for strategies to promote healing and regeneration. The goal here is to link a fundamental understanding of connective tissues and their multiscale properties to better inform the design and translation of novel biomaterials to promote their regeneration. Major clinical problems in adipose tissue, cartilage, dermis, and tendon are discussed that inspire the need to replace native connective tissue with biomaterials. Then, multiscale structure-function relationships in native soft connective tissues that may be used to guide material design are detailed. Several biomaterials strategies to improve healing of these tissues that incorporate biologics and are biologic-free are reviewed. Finally, important guidance documents and standards (ASTM, FDA, and EMA) that are important to consider for translating new biomaterials into clinical practice are highligted.
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Affiliation(s)
- Benjamin R Freedman
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
| | - David J Mooney
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
- Wyss Institute for Biologically Inspired Engineering, Harvard University, Boston, MA, 02115, USA
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27
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Zellers JA, Marmon AR, Ebrahimi A, Silbernagel KG. Lower extremity work along with triceps surae structure and activation is altered with jumping after Achilles tendon repair. J Orthop Res 2019; 37:933-941. [PMID: 30816587 PMCID: PMC6470019 DOI: 10.1002/jor.24260] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Accepted: 02/12/2019] [Indexed: 02/04/2023]
Abstract
Achilles tendon rupture leads to long term plantar flexor deficits. The purpose of this study was to describe changes in jumping biomechanics along with triceps surae structure and activation in individuals after Achilles repair. Eleven individuals 1-3 years following Achilles repair and 10 healthy controls were included. Kinetics and kinematics, analyzed using a constituent lower extremity work (CLEW) approach, and muscle activity using surface electromyography (EMG) were collected during a unilateral hopping task. Triceps surae myotendinous structure was assessed using ultrasound imaging. There were no differences in jump height, absolute limb work, or cost of transport between groups. During takeoff, the knee did more (p < 0.001) and ankle did less concentric work (p < 0.001), and lateral gastrocnemius rate of rise was higher (p = 0.02) on the ruptured side. During landing, the knee did more eccentric work (p = 0.033) and lateral gastrocnemius (p = 0.003) and soleus (p = 0.02) activation amplitude prior to landing was higher on the ruptured side. Individuals after Achilles tendon repair shift work toward the knee and alter muscle recruitment. Differences in lateral gastrocnemius activity may indicate that it is well-situated to generate power during takeoff and assist in landing with the soleus. The lack of change in muscle activity and decreased cross sectional area of the medial gastrocnemius may suggest that this muscle atrophies and does not accommodate to the hopping task. Clinical Significance: Proximal lower extremity strengthening along with emphasizing medial gastrocnemius and soleus activation during the recovery of patients with Achilles tendon repair may be rehabilitative targets for improved jumping performance. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res.
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Affiliation(s)
- Jennifer A. Zellers
- Department of Physical Therapy, University of Delaware, 540 S. College Ave, Newark, DE 19713, USA,
| | - Adam R. Marmon
- Department of Physical Therapy, University of Delaware, 540 S. College Ave, Newark, DE 19713, USA,
| | - Anahid Ebrahimi
- Department of Mechanical Engineering, University of Wisconsin-Madison, 1513 University Ave, Madison, WI, 53706, USA,
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28
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Baxter JR, Farber DC, Hast MW. Plantarflexor fiber and tendon slack length are strong determinates of simulated single-leg heel raise height. J Biomech 2019; 86:27-33. [PMID: 30722935 DOI: 10.1016/j.jbiomech.2019.01.035] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Revised: 01/15/2019] [Accepted: 01/17/2019] [Indexed: 10/27/2022]
Abstract
Achilles tendon ruptures have been linked with detrimental changes in muscle-tendon structure, which may help explain long-term functional deficits. However, the causal effects of muscle-tendon structure on joint function have not been tested in a controlled setting. Therefore, the purpose of this study was to test the implications of muscle-tendon unit parameters on simulated single-leg heel raise height. We hypothesized that muscle fiber length and resting ankle angle - a clinical surrogate measure of tendon slack length - would predict single-leg heel raise height more strongly than other parameters. To test this hypothesis, we developed a two-part simulation paradigm that recreated clinically relevant muscle-tendon scenarios and then tested these parameters on single-leg heel raise height. We found that longer muscle fibers had the greatest positive effect on single-leg heel raise height. However, tendon slack length, determined by simulating resting ankle angles in a secondary analysis, revealed a stronger negative correlation with heel raise height. Our findings support previous clinical observations that both muscle fascicle length and resting tendon length are important muscle-tendon parameters for patient function. In addition to minimizing tendon elongation following rupture, treatment plans should focus on preserving plantarflexor muscle structure to mitigate functional loses following Achilles tendon ruptures.
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Affiliation(s)
- Josh R Baxter
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA, USA.
| | - Daniel C Farber
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA, USA
| | - Michael W Hast
- Department of Orthopaedic Surgery, University of Pennsylvania, Philadelphia, PA, USA
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29
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Manegold S, Tsitsilonis S, Schumann J, Gehlen T, Agres AN, Keller J, Gesslein M, Wichlas F. Functional outcome and complication rate after percutaneous suture of fresh Achilles tendon ruptures with the Dresden instrument. J Orthop Traumatol 2018; 19:19. [PMID: 30229505 PMCID: PMC6143488 DOI: 10.1186/s10195-018-0511-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Accepted: 07/19/2018] [Indexed: 11/10/2022] Open
Abstract
Background The aim of this study was to evaluate the outcome of patients with a rupture of the Achilles tendon (ATR) treated percutaneously with the Dresden instrument in the hands of surgeons others than its inventors. Materials and methods 118 patients (FU rate: 77.1%) with an acute ATR treated with the Dresden instrument were retrospectively evaluated. The following data were evaluated: pain intensity, functional limitation, Hannover score, Achilles tendon total rupture score (ATRS), AOFAS ankle-hindfoot score, Tegner activity score, complications, maximum calf circumference (MCC) on both sides, and the Matles test for tendon lengthening. The effect of the time point of the surgery after trauma was examined. Results Hannover scores and ATRSs were good; AOFAS scores were excellent. Almost all patients returned to sporting activities postoperatively, and 66.1% were able to return to their previous level. The Tegner activity score revealed a slight posttraumatic decrease (p = 0.009) in the level of physical activity overall (pre-injury: 5.37 ± 0.15; postoperatively: 4.77 ± 0.15). The re-rupture rate was 2%. No sural nerve lesions and no infections were reported. Even after 3 years, there was still a difference in MCC that was correlated with inferior clinical score and AT lengthening. Patients treated within the first 2 days after ATR showed inferior clinical outcomes in terms of AOFAS score, ATRS, and functional limitations. Conclusions Percutaneous ATR suture with the Dresden instrument is a safe and reliable method. Low complication and re-rupture rates, good clinical results, and a high rate of return to play support this fact. The time point of the operation may influence the outcome.
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Affiliation(s)
- Sebastian Manegold
- Center for Musculoskeletal Surgery, Charité-University Medicine Berlin, Campus Virchow Clinic, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Serafim Tsitsilonis
- Center for Musculoskeletal Surgery, Charité-University Medicine Berlin, Campus Virchow Clinic, Augustenburger Platz 1, 13353, Berlin, Germany.
| | - Jakob Schumann
- Center for Musculoskeletal Surgery, Charité-University Medicine Berlin, Campus Virchow Clinic, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Tobias Gehlen
- Center for Musculoskeletal Surgery, Charité-University Medicine Berlin, Campus Virchow Clinic, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Alison N Agres
- Julius Wolff Institute, Charité-University Medicine Berlin, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Johannes Keller
- Center for Musculoskeletal Surgery, Charité-University Medicine Berlin, Campus Virchow Clinic, Augustenburger Platz 1, 13353, Berlin, Germany
| | - Markus Gesslein
- Clinic for Orthopaedics and Traumatology, Klinikum Nürnberg Süd, Paracelsus University, Breslauer Str. 201, 90471, Nuremberg, Germany
| | - Florian Wichlas
- Clinic for Orthopaedics and Traumatology, University of Salzburg, Müllner Hauptstraße 48, Salzburg, Austria
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Lower material stiffness in rupture-repaired Achilles tendon during walking: transmission-mode ultrasound for post-surgical tendon evaluation. Knee Surg Sports Traumatol Arthrosc 2018; 26:2030-2037. [PMID: 28660438 DOI: 10.1007/s00167-017-4624-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2017] [Accepted: 06/19/2017] [Indexed: 10/19/2022]
Abstract
PURPOSE This cross-sectional study used transmission-mode ultrasound to evaluate dynamic tendon properties during walking in surgically repaired and contralateral Achilles tendon (AT), with a median (range) post-operative period of 22 (4-58) months. It was hypothesised that the axial transmission speed of ultrasound (TSOU) during walking would be slower, indicating lower material stiffness in repaired compared with contralateral AT. METHODS Ten patients [median (range) age 47 (37-69) years; height 180 (170-189) cm; weight 93 (62-119) kg], who had undergone open surgical repair of the AT and were clinically recovered according to their treating clinicians, walked barefoot on a treadmill at self-selected speed (1.0 ± 0.2 m/s). Synchronous measures of TSOU, sagittal ankle motion, vertical ground reaction force (GRF), and spatiotemporal gait parameters were recorded during 20 s of steady-state walking. Paired t tests were used to evaluate potential between-limb differences in TSOU, GRF, ankle motion, and spatiotemporal gait parameters. RESULTS TSOU was significantly lower (≈175 m/s) in the repaired than in the contralateral AT over the entire gait cycle (P < 0.05). Sagittal ankle motion was significantly greater (≈3°) in the repaired than in the contralateral limb (P = 0.036). There were no significant differences in GRF or spatiotemporal parameters between limbs. CONCLUSIONS Repaired AT was characterised by a lower TSOU, reflecting a lower material stiffness in the repaired tendon than in the contralateral tendon. A lower material stiffness may underpin greater ankle joint motion of the repaired limb during walking and long-term deficits in the muscle-tendon unit reported with AT repair. Treatment and rehabilitation approaches that focus on increasing the material stiffness of the repaired AT may be clinically beneficial. Transmission-mode ultrasound would seem useful for quantifying tendon properties post AT rupture repair and may have the potential to individually guide rehabilitation programmes, thereby aiding safer return to physical activity. LEVEL OF EVIDENCE II.
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Jandacka D, Plesek J, Skypala J, Uchytil J, Silvernail JF, Hamill J. Knee Joint Kinematics and Kinetics During Walking and Running After Surgical Achilles Tendon Repair. Orthop J Sports Med 2018; 6:2325967118779862. [PMID: 29977947 PMCID: PMC6024538 DOI: 10.1177/2325967118779862] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
BACKGROUND Despite the increasing incidence of Achilles tendon (AT) ruptures, there is a lack of information on the possible risks associated with regular running and walking for exercise after an injury. There are some known kinematic gait changes after an AT rupture, especially at the knee. However, it is not clear whether runners with AT ruptures may be at risk for secondary knee injuries during shod or barefoot running/walking. PURPOSE/HYPOTHESIS The purpose of this study was to compare the kinematics and kinetics of barefoot walking and barefoot and shod running between athletes with a history of AT ruptures and a healthy control group. We hypothesized that there would be increased knee joint loads in the affected limb of the AT rupture group, especially during shod running. STUDY DESIGN Controlled laboratory study. METHODS Ten patients who had undergone surgical treatment of a unilateral acute AT rupture (6.1 ± 3.7 years postoperatively ) and 10 control participants were matched according to age, sex, physical activity, weight, height, and footfall type. The kinematics and kinetics of barefoot walking and barefoot and shod running were recorded using a high-speed motion capture system synchronized with force platforms. RESULTS The main outcome measures were lower extremity joint angles and moments during the stance phase of walking and running. After AT repair, athletes had increased internal knee abduction moments during shod and barefoot running compared with the healthy control group (P < .05, η2 > 0.14). There were no significant differences in kinematics and kinetics during walking between the AT rupture and healthy control groups (P ≥ .05). CONCLUSION After an AT rupture, athletes had increased internal knee abduction moments during running compared with the healthy control group. CLINICAL RELEVANCE The increased abduction loads on the knee in patients with an AT rupture could lead to further running-related injuries. However, barefoot walking may be used as a proprioceptive exercise without an increased risk of overuse injuries in these patients.
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Affiliation(s)
- Daniel Jandacka
- Human Motion Diagnostic Centre, Department of Human Movement Studies, University of Ostrava, Ostrava, Czech Republic
| | - Jan Plesek
- Human Motion Diagnostic Centre, Department of Human Movement Studies, University of Ostrava, Ostrava, Czech Republic
| | - Jiri Skypala
- Human Motion Diagnostic Centre, Department of Human Movement Studies, University of Ostrava, Ostrava, Czech Republic
| | - Jaroslav Uchytil
- Department of Kinesiology and Nutrition Sciences, University of Nevada, Las Vegas, Las Vegas, Nevada, USA
| | - Julia Freedman Silvernail
- Department of Kinesiology and Nutrition Sciences, University of Nevada, Las Vegas, Las Vegas, Nevada, USA
| | - Joseph Hamill
- Human Motion Diagnostic Centre, Department of Human Movement Studies, University of Ostrava, Ostrava, Czech Republic
- Department of Kinesiology, University of Massachusetts Amherst, Amherst, Massachusetts, USA
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Orishimo KF, Schwartz-Balle S, Tyler TF, McHugh MP, Bedford BB, Lee SJ, Nicholas SJ. Can Weakness in End-Range Plantar Flexion After Achilles Tendon Repair Be Prevented? Orthop J Sports Med 2018; 6:2325967118774031. [PMID: 29845085 PMCID: PMC5967157 DOI: 10.1177/2325967118774031] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Background Disproportionate end-range plantar flexion weakness, decreased passive stiffness, and inability to perform a heel rise on a decline after Achilles tendon repair are thought to reflect increased tendon compliance or tendon lengthening. Since this was first noted, we have performed stronger repairs and avoided stretching into dorsiflexion for the first 12 weeks after surgery. Hypothesis Using stronger repairs and avoiding stretching into dorsiflexion would eliminate end-range plantar flexion weakness and normalize passive stiffness. Study Design Case series; Level of evidence, 4. Methods Achilles repairs with epitendinous augmentation were performed on 18 patients. Plantar flexion torque, dorsiflexion range of motion (ROM), passive joint stiffness, and standing single-legged heel rise on a decline were assessed at 43 ± 24 months after surgery (range, 9 months to 8 years). Maximum isometric plantar flexion torque was measured at 20° and 10° of dorsiflexion, neutral position, and 10° and 20° of plantar flexion. Passive dorsiflexion ROM was measured with a goniometer. Passive joint stiffness was computed from the increase in passive torque from 10° to 20° of dorsiflexion. Tendon thickness was measured by use of digital calipers. Plantar flexion electromyographic (EMG) data were recorded during strength and functional tests. Analysis of variance and chi-square tests were used to assess weakness and function. Results Marked weakness was evident on the involved side at 20° of plantar flexion (deficit, 26% ± 18%; P < .001), with no weakness at 20° of dorsiflexion (deficit, 6% ± 17%; P = .390). Dorsiflexion ROM was decreased 5.5° ± 8° (P = .015), and tendon width was 8 ± 3 mm greater on the involved side (P < .001). Passive joint stiffness was similar between the involved and noninvolved sides. Only 2 of 18 patients could perform a decline heel rise on the involved side compared with 18 of 18 on the noninvolved side (P = .01). No difference in EMG amplitude was found between the involved and noninvolved sides during the strength or heel rise tests. Conclusion The use of stronger repair techniques and attempts to limit tendon elongation by avoiding dorsiflexion stretching did not eliminate weakness in end-range plantar flexion. EMG data confirmed that end-range weakness was not due to neural inhibition. Physiological changes that alter the force transmission capability of the healing tendon may be responsible for this continued impairment. This weakness has implications for high-demand jumping and sprinting after Achilles tendon repair.
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Affiliation(s)
- Karl F Orishimo
- Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, New York, USA
| | - Sidse Schwartz-Balle
- Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, New York, USA
| | - Timothy F Tyler
- Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, New York, USA
| | - Malachy P McHugh
- Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, New York, USA
| | - Benjamin B Bedford
- Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, New York, USA
| | - Steven J Lee
- Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, New York, USA
| | - Stephen J Nicholas
- Nicholas Institute of Sports Medicine and Athletic Trauma, Lenox Hill Hospital, New York, New York, USA
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Agres AN, Gehlen TJ, Arampatzis A, Taylor WR, Duda GN, Manegold S. Short-term functional assessment of gait, plantarflexor strength, and tendon properties after Achilles tendon rupture. Gait Posture 2018; 62:179-185. [PMID: 29554516 DOI: 10.1016/j.gaitpost.2018.03.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/09/2017] [Revised: 02/23/2018] [Accepted: 03/03/2018] [Indexed: 02/02/2023]
Abstract
BACKGROUND Although early functional rehabilitation (EFR) has been suggested to yield rapid functional recovery after Achilles tendon rupture (ATR) compared to conventional rehabilitation (CR), most quantitative assessments occur long after rehabilitation has been completed. Few data exist regarding the short-term functional gains during the healing period post-ATR. It remains unclear if EFR allows for an objectively faster return to function. The aim of this study was to examine EFR's effect on gait, plantarflexor strength, and tendon properties in early post-operative follow-ups. METHODS Fourteen patients received either EFR (n = 6) or CR (n = 8) after percutaneous ATR repair. Functional gait analysis, maximal voluntary isometric contractions (MVICs), and Achilles tendon properties were assessed at 8 and 12 weeks post-op. RESULTS Comparison of EFR against CR yielded no statistically significant differences in ankle kinematics or kinetics, Achilles tendon properties or MVICs on the injured (INJ) ankle at either time point. During gait, only CR patients demonstrated significantly lower plantarflexion moments on INJ at 8 weeks (0.817 ± 0.151 N·m/kg vs. 1.172 ± 0.177 N·m/kg, p = 0.002). All patients exhibited deficits in plantarflexor moment at 8 weeks and eversion moment at 12 weeks on INJ during gait that had effect sizes of note when compared to CON. SIGNIFICANCE ATR patients, regardless of rehabilitation, exhibit deficits in gait, AT properties, and single-limb strength at 8 weeks. Though AT properties and single-limb plantarflexor isometric strength remain at a deficit at 12 weeks, bipedal plantarflexion moments are comparable between INJ and CON. Though effect size calculations suggested clinically significant differences, clear benefits of EFR compared to CR were not found.
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Affiliation(s)
- Alison N Agres
- Julius Wolff Institute, Charité-Universitätsmedizin Berlin, Germany.
| | - Tobias J Gehlen
- Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Germany
| | | | | | - Georg N Duda
- Julius Wolff Institute, Charité-Universitätsmedizin Berlin, Germany
| | - Sebastian Manegold
- Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Germany
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Jandacka D, Silvernail JF, Uchytil J, Zahradnik D, Farana R, Hamill J. Do athletes alter their running mechanics after an Achilles tendon rupture? J Foot Ankle Res 2017; 10:53. [PMID: 29209417 PMCID: PMC5704504 DOI: 10.1186/s13047-017-0235-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2017] [Accepted: 11/20/2017] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Over the past thirty years, there has been dramatic increase in incidence of Achilles tendon rupture in the athletic population. The purpose of this study was to compare the lower extremity mechanics of Achilles tendon ruptured runners with healthy controls. METHODS The participants with a past history of an Achilles tendon repair (n = 11) and healthy control (n = 11) subgroups were matched on sex, age, type of regular physical activity, mass, height, footfall pattern and lateral dominancy. Running kinetics and kinematics of the ankle, knee and hip were recorded using a high-speed motion capture system interfaced with a force platform. Achilles tendon length was measured using ultrasonography. Main outcome measures were lower extremity joint angles and moments during stance phase of running and Achilles tendon lengths. RESULTS Athletes from Achilles tendon group had an affected gastro-soleus complex. Athletes with history of Achilles tendon rupture had reduced ankle range of motion during second half of the stance phase of running (Δ7.6°), an overextended knee during initial contact (Δ5.2°) and increased affected knee range of motion (Δ4.4°) during the first half of stance phase on their affected limb compared to the healthy control group. There was a 22% increase in the maximal hip joint moment on contralateral side of the Achilles tendon group compared to the healthy controls. CONCLUSION These results suggest a compensation mechanism, relatively extended knee at initial ground contact against the deficit in the muscle-tendon complex of the triceps surae. Overextension during sporting activities may place the knee at risk for further injury. Avoidance of AT lengthening and plantarflexion strength deficit after surgery and during rehabilitation might help to manage AT rupture since these factors may be responsible for altered running kinematics.
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Affiliation(s)
- Daniel Jandacka
- Department of Human Movement Studies, Human Motion Diagnostic Center, University of Ostrava, Varenska 40 A, 70200 Ostrava, Czech Republic
| | | | - Jaroslav Uchytil
- Department of Human Movement Studies, Human Motion Diagnostic Center, University of Ostrava, Varenska 40 A, 70200 Ostrava, Czech Republic
| | - David Zahradnik
- Department of Human Movement Studies, Human Motion Diagnostic Center, University of Ostrava, Varenska 40 A, 70200 Ostrava, Czech Republic
| | - Roman Farana
- Department of Human Movement Studies, Human Motion Diagnostic Center, University of Ostrava, Varenska 40 A, 70200 Ostrava, Czech Republic
| | - Joseph Hamill
- Department of Human Movement Studies, Human Motion Diagnostic Center, University of Ostrava, Varenska 40 A, 70200 Ostrava, Czech Republic
- Department of Kinesiology, University of Massachusetts, Amherst, USA
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Brorsson A, Willy RW, Tranberg R, Grävare Silbernagel K. Heel-Rise Height Deficit 1 Year After Achilles Tendon Rupture Relates to Changes in Ankle Biomechanics 6 Years After Injury. Am J Sports Med 2017; 45:3060-3068. [PMID: 28783473 DOI: 10.1177/0363546517717698] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND It is unknown whether the height of a heel-rise performed in the single-leg standing heel-rise test 1 year after an Achilles tendon rupture (ATR) correlates with ankle biomechanics during walking, jogging, and jumping in the long-term. PURPOSE To explore the differences in ankle biomechanics, tendon length, calf muscle recovery, and patient-reported outcomes at a mean of 6 years after ATR between 2 groups that, at 1-year follow-up, had less than 15% versus greater than 30% differences in heel-rise height. STUDY DESIGN Cohort study; Level of evidence, 3. METHODS Seventeen patients with less than 15% (<15% group) and 17 patients with greater than 30% (>30% group) side-to-side difference in heel-rise height at 1 year after ATR were evaluated at a mean (SD) 6.1 (2.0) years after their ATR. Ankle kinematics and kinetics were sampled via standard motion capture procedures during walking, jogging, and jumping. Patient-reported outcome was evaluated with Achilles tendon Total Rupture Score (ATRS), Physical Activity Scale (PAS), and Foot and Ankle Outcome Score (FAOS). Tendon length was evaluated by ultrasonography. The Limb Symmetry Index (LSI = [Injured Side ÷ Healthy Side] × 100) was calculated for side differences. RESULTS The >30% group had significantly more deficits in ankle kinetics during all activities compared with patients in the <15% group at a mean of 6 years after ATR (LSI, 70%-149% and 84%-106%, respectively; P = .010-.024). The >30% group, compared with the <15% group, also had significantly lower values in heel-rise height (LSI, 72% and 95%, respectively; P < .001) and heel-rise work (LSI, 58% and 91%, respectively; P < .001) and significantly larger side-to-side difference in tendon length (114% and 106%, respectively; P = .012). Achilles tendon length correlated with ankle kinematic variables ( r = 0.38-0.44; P = .015-.027) whereas heel-rise work correlated with kinetic variables ( r = -0.57 to 0.56; P = .001-.047). LSI tendon length correlated negatively with LSI heel-rise height ( r = -0.41; P = .018). No differences were found between groups in patient-reported outcome ( P = .143-.852). CONCLUSION Height obtained during the single-leg standing heel-rise test performed 1 year after ATR related to the long-term ability to regain normal ankle biomechanics. Minimizing tendon elongation and regaining heel-rise height may be important for the long-term recovery of ankle biomechanics, particularly during more demanding activities such as jumping.
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Affiliation(s)
- Annelie Brorsson
- Department of Orthopaedics, Institute of Clinical Sciences at Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Richard W Willy
- Department of Physical Therapy, College of Allied Health Sciences, East Carolina University, Greenville, North Carolina, USA
| | - Roy Tranberg
- Department of Orthopaedics, Institute of Clinical Sciences at Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Karin Grävare Silbernagel
- Department of Orthopaedics, Institute of Clinical Sciences at Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden.,Department of Physical Therapy, University of Delaware, Newark, Delaware, USA
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Dams OC, Reininga IHF, Gielen JL, van den Akker-Scheek I, Zwerver J. Imaging modalities in the diagnosis and monitoring of Achilles tendon ruptures: A systematic review. Injury 2017; 48:2383-2399. [PMID: 28943056 DOI: 10.1016/j.injury.2017.09.013] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/06/2017] [Revised: 09/10/2017] [Accepted: 09/11/2017] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To determine the role of imaging in the diagnosis and monitoring of the Achilles tendon rupture (ATR). STUDY DESIGN Systematic review. DATA SOURCES PubMed and EMBASE in November 2016. ELIGIBILITY CRITERIA Clinical studies providing information on the methods and role of imaging in the diagnosis and monitoring of the ATR were included. RESULTS Fifty-six studies were included, most concerning the use of ultrasound (n=37) or MRI (n=18). Seven studies provided data on the diagnostic accuracy of imaging. Most ultrasound studies used a 7.5MHz probe (19/32 studies) and scanned the patient bilaterally in prone position, with recent studies tending to use higher frequency probes (r=0.42). Sensitivity [for detecting a rupture] ranged from 79.6 to 100%; the spread in specificity was large but two studies showed perfect (100%) data. Negative and positive likelihood ratios ranged from 0 to 0.23 and 1.0 to 10 respectively. MRI examination was generally performed with 1.5Tesla (T) MRI (6/12 studies) with a strong trend for higher T strength in more recent studies (r=0.71). One study reported a sensitivity of 90.9% and one a specificity of 100%. Although imaging can visualize structure and healing, these results were generally not related to the clinical picture. Overall, ultrasound was recommended over MRI for diagnosis and monitoring. Results of other imaging modalities remain inconclusive. CONCLUSION The adjunct role of imaging, especially of ultrasound and MRI, in the diagnosis and monitoring of ATRs was established. It is therefore recommended to rely primarily on the clinical examination and evaluation and to use imaging for ruling out other injuries and providing additional clinical information. More high-quality research is warranted into the diagnostic accuracy of imaging as well as less conventional imaging modalities' diagnostic and monitoring capabilities.
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Affiliation(s)
- Olivier C Dams
- University of Groningen, University Medical Center Groningen, Department of Sport and Exercise Medicine, Hanzeplein 1, 9713 GZ Groningen, The Netherlands.
| | - Inge H F Reininga
- University of Groningen, University Medical Center Groningen, Department of Trauma Surgery, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Jan L Gielen
- Antwerp University Hospital, S.P.O.R.T.S., Wilrijkstraat 10, Edegem-Antwerp, 2650, Belgium
| | - Inge van den Akker-Scheek
- University of Groningen, University Medical Center Groningen, Department of Sport and Exercise Medicine, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
| | - Johannes Zwerver
- University of Groningen, University Medical Center Groningen, Department of Sport and Exercise Medicine, Hanzeplein 1, 9713 GZ Groningen, The Netherlands
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Minkwitz S, Schmock A, Kurtoglu A, Tsitsilonis S, Manegold S, Wildemann B, Klatte-Schulz F. Time-Dependent Alterations of MMPs, TIMPs and Tendon Structure in Human Achilles Tendons after Acute Rupture. Int J Mol Sci 2017; 18:ijms18102199. [PMID: 29053586 PMCID: PMC5666880 DOI: 10.3390/ijms18102199] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2017] [Revised: 10/10/2017] [Accepted: 10/17/2017] [Indexed: 12/27/2022] Open
Abstract
A balance between matrix metalloproteinases (MMPs) and their inhibitors (TIMPs) is required to maintain tendon homeostasis. Variation in this balance over time might impact on the success of tendon healing. This study aimed to analyze structural changes and the expression profile of MMPs and TIMPs in human Achilles tendons at different time-points after rupture. Biopsies from 37 patients with acute Achilles tendon rupture were taken at surgery and grouped according to time after rupture: early (2–4 days), middle (5–6 days), and late (≥7 days), and intact Achilles tendons served as control. The histological score increased from the early to the late time-point after rupture, indicating the progression towards a more degenerative status. In comparison to intact tendons, qRT-PCR analysis revealed a significantly increased expression of MMP-1, -2, -13, TIMP-1, COL1A1, and COL3A1 in ruptured tendons, whereas TIMP-3 decreased. Comparing the changes over time post rupture, the expression of MMP-9, -13, and COL1A1 significantly increased, whereas MMP-3 and -10 expression decreased. TIMP expression was not significantly altered over time. MMP staining by immunohistochemistry was positive in the ruptured tendons exemplarily analyzed from early and late time-points. The study demonstrates a pivotal contribution of all investigated MMPs and TIMP-1, but a minor role of TIMP-2, -3, and -4, in the early human tendon healing process.
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Affiliation(s)
- Susann Minkwitz
- Julius Wolff Institute, Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany.
- Berlin-Brandenburg Center for Regenerative Therapies, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany.
| | - Aysha Schmock
- Julius Wolff Institute, Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany.
| | - Alper Kurtoglu
- Julius Wolff Institute, Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany.
| | - Serafeim Tsitsilonis
- Julius Wolff Institute, Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany.
| | - Sebastian Manegold
- Julius Wolff Institute, Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany.
| | - Britt Wildemann
- Julius Wolff Institute, Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany.
- Berlin-Brandenburg Center for Regenerative Therapies, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany.
| | - Franka Klatte-Schulz
- Julius Wolff Institute, Center for Musculoskeletal Surgery, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany.
- Berlin-Brandenburg Center for Regenerative Therapies, Charité-Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, 13353 Berlin, Germany.
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Peng WC, Chang YP, Chao YH, Fu SN, Rolf C, Shih TT, Su SC, Wang HK. Morphomechanical alterations in the medial gastrocnemius muscle in patients with a repaired Achilles tendon: Associations with outcome measures. Clin Biomech (Bristol, Avon) 2017; 43:50-57. [PMID: 28208087 DOI: 10.1016/j.clinbiomech.2017.02.002] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 12/21/2016] [Accepted: 02/06/2017] [Indexed: 02/07/2023]
Abstract
BACKGROUND Functional deficits are found in ankles that have sustained an Achilles rupture. This study sought to evaluate and compare the morphomechanical characteristics of the medial gastrocnemius muscle in the legs of participants within six months of a unilateral Achilles repair to determine any correlations between those characteristics and objective outcomes and self-reported functional levels. METHODS Fifteen participants were assessed via measurements of muscle morphologies (fascicle length, pennation angle, and muscle thickness) in a resting state, the mechanical properties of the proximal aponeurosis of the medial gastrocnemius muscle, the pennation angle during ramping maximal voluntary isometric contractions (MVIC), the heel raise test, and the Taiwan Chinese version of the Lower Extremity Functional Scale (LEFS-TC) questionnaire. Findings Compared with the non-injured legs, the repaired legs showed a lower muscle fascicle length (mean 4.4 vs. 5.0cm) and thickness (1.7 vs. 1.9cm), lower stiffness of the GM tendon and aponeurosis (174.1 vs. 375.6N/mm), and a greater GM pennation angle (31.2 vs. 28.9°) during 90% MVIC (all p≤0.05). Correlations were found between the morphomechanical results and maximal heel raise heights or the LEFS-TC score, and between the symmetry ratios of the fascicle lengths and the LEFS-TC score. Interpretation There are decreases in fascicle length, muscle thickness and mechanical properties in the medial gastrocnemius muscles of the participants within the first six months after an Achilles repair. These morphomechanical alterations demonstrate associations with functional levels in the lower extremities and indicated the need for early mobilization of the calf muscles after the repair.
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Affiliation(s)
- Wei-Chen Peng
- School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Center of Physical Therapy, National Taiwan University Hospital, Taipei, Taiwan
| | - Yi-Ping Chang
- School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Center of Physical Therapy, National Taiwan University Hospital, Taipei, Taiwan
| | - Yuan-Hung Chao
- School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Center of Physical Therapy, National Taiwan University Hospital, Taipei, Taiwan
| | - S N Fu
- Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Christer Rolf
- Department of Orthopaedics, Clintec, Karolinska Institutet, Karolinska University Hospital, Stockholm, Sweden
| | - Tiffany Tf Shih
- Department of Medical Image, National Taiwan University Hospital, Department of Surgery, College of Medicine, National Taiwan University, Taiwan
| | - Sheng-Chu Su
- Department of Business Administration, Hwa Hsia Institute of Technology, Taipei, Taiwan
| | - Hsing-Kuo Wang
- School and Graduate Institute of Physical Therapy, College of Medicine, National Taiwan University, Center of Physical Therapy, National Taiwan University Hospital, Taipei, Taiwan.
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Patients With Insertional Achilles Tendinopathy Exhibit Differences in Ankle Biomechanics as Opposed to Strength and Range of Motion. J Orthop Sports Phys Ther 2016; 46:1051-1060. [PMID: 27796197 DOI: 10.2519/jospt.2016.6462] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Study Design Controlled laboratory study; cross-sectional. Background Little is known about ankle range of motion (ROM) and strength among patients with insertional Achilles tendinopathy (IAT) and whether limited ankle ROM and plantar flexor weakness impact IAT symptom severity. Objectives The purposes of the study were (1) to examine whether participants with IAT exhibit limited non-weight-bearing dorsiflexion ROM, reduced plantar flexor strength, and/or altered ankle biomechanics during stair ascent; and (2) to determine which impairments are associated with symptom severity. Methods Participants included 20 patients with unilateral IAT (mean ± SD age, 59 ± 8 years; 55% female) and 20 individuals without tendinopathy (age, 58.2 ± 8.5 years; 55% female). A dynamometer was used to measure non-weight-bearing ROM and isometric plantar flexor strength. Three-dimensional motion analysis was used to quantify ankle biomechanics during stair ascent. End-range dorsiflexion was quantified as the percentage of non-weight-bearing dorsiflexion used during stair ascent. Group differences were compared using 2-way and 1-way analyses of variance. Pearson correlations were used to test for associations among dependent variables and symptom severity. Results Groups differed in ankle biomechanics, but not non-weight-bearing ROM or strength. During stair ascent, the IAT group used greater end-range dorsiflexion (P = .03), less plantar flexion (P = .02), and lower peak ankle plantar flexor power (P = .01) than the control group. Higher end-range dorsiflexion and lower ankle power during stair ascent were associated with greater symptom severity (P<.05). Conclusion Patients with IAT do not experience restrictions in non-weight-bearing dorsiflexion ROM or isometric plantar flexor strength. However, altered ankle biomechanics during stair ascent were linked with greater symptom severity and likely contribute to decreased function. J Orthop Sports Phys Ther 2016;46(12):1051-1060. Epub 29 Oct 2016. doi:10.2519/jospt.2016.6462.
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Oda H, Sano K, Kunimasa Y, Komi PV, Ishikawa M. Neuromechanical Modulation of the Achilles Tendon During Bilateral Hopping in Patients with Unilateral Achilles Tendon Rupture, Over 1 Year After Surgical Repair. Sports Med 2016; 47:1221-1230. [DOI: 10.1007/s40279-016-0629-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Aspenberg P, Schepull T. Substantial creep in healing human Achilles tendons. A pilot study. Muscles Ligaments Tendons J 2015; 5:151-5. [PMID: 26605187 DOI: 10.11138/mltj/2015.5.3.151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
BACKGROUND healing after rupture of the Achilles tendon can be described in terms of mechanical properties of the new-formed tissue, constituting the tendon callus. In previous human studies, the elastic modulus and the density remained almost constant during 3 months after mobilization started, and then improved up to one year. So far, time-dependent deformation of the healing human tendon has not been reported. METHODS in a series of 16 patients, operated with Achilles tendon suture, we implanted tantalum beads into the tendon and measured the distance between them repeatedly during 3 min of constant loading, using an ordinary image intensifier. The patients unloaded their leg for 30 min before the test. To avoid bias, all images were investigated in a randomized and blinded order. RESULTS total strain during 3 min of constant loading at 7 weeks post injury amounted to 5%, and at 19 weeks to 3%. About half of the strain, after the loading was applied, occurred during the second and third min. Considerable strain also occurred just before loading, when the patient was told that a load would be applied, but before this was actually done. CONCLUSION the measurements were crude, and this study should be seen as a pilot. Still, visco-elastic properties seem to dominate the mechanical behavior the healing Achilles tendon from start of mobilization to 19 weeks, at least when tested after 30 min rest. This deserves further studies with more precise methods.
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Affiliation(s)
- Per Aspenberg
- Orthopedics, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - Thorsten Schepull
- Orthopedics, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
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