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Kharaz YA, Zamboulis DE, Fang Y, Welting TJM, Peffers MJ, Comerford EJ. Small RNA signatures of the anterior cruciate ligament from patients with knee joint osteoarthritis. Front Mol Biosci 2023; 10:1266088. [PMID: 38187089 PMCID: PMC10768046 DOI: 10.3389/fmolb.2023.1266088] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Accepted: 12/05/2023] [Indexed: 01/09/2024] Open
Abstract
Introduction: The anterior cruciate ligament (ACL) is susceptible to degeneration, resulting in joint pain, reduced mobility, and osteoarthritis development. There is currently a paucity of knowledge on how anterior cruciate ligament degeneration and disease leads to osteoarthritis. Small non-coding RNAs (sncRNAs), such as microRNAs and small nucleolar RNA (snoRNA), have diverse roles, including regulation of gene expression. Methods: We profiled the sncRNAs of diseased osteoarthritic ACLs to provide novel insights into osteoarthritis development. Small RNA sequencing from the ACLs of non- or end-stage human osteoarthritic knee joints was performed. Significantly differentially expressed sncRNAs were defined, and bioinformatics analysis was undertaken. Results and Discussion: A total of 184 sncRNAs were differentially expressed: 68 small nucleolar RNAs, 26 small nuclear RNAs (snRNAs), and 90 microRNAs. We identified both novel and recognized (miR-206, -365, and -29b and -29c) osteoarthritis-related microRNAs and other sncRNAs (including SNORD72, SNORD113, and SNORD114). Significant pathway enrichment of differentially expressed miRNAs includes differentiation of the muscle, inflammation, proliferation of chondrocytes, and fibrosis. Putative mRNAs of the microRNA target genes were associated with the canonical pathways "hepatic fibrosis signaling" and "osteoarthritis." The establishing sncRNA signatures of ACL disease during osteoarthritis could serve as novel biomarkers and potential therapeutic targets in ACL degeneration and osteoarthritis development.
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Affiliation(s)
- Yalda A. Kharaz
- Department of Musculoskeletal Ageing Sciences, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Danae E. Zamboulis
- Comparative Biomedical Sciences, Royal Veterinary College, London, United Kingdom
| | - Yongxiang Fang
- Centre for Genomic Research, Institute of Integrative Biology, University of Liverpool, Liverpool, United Kingdom
| | - Tim J. M. Welting
- Department of Orthopaedic Surgery, Maastricht University Medical Centre, Maastricht, Netherlands
| | - Mandy J. Peffers
- Department of Musculoskeletal Ageing Sciences, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Eithne J. Comerford
- Department of Musculoskeletal Ageing Sciences, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
- Institute of Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
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Irawan DS, Huoth C, Sinsurin K, Kiratisin P, Vachalathiti R, Richards J. Concurrent Validity and Reliability of Two-dimensional Frontal Plane Knee Measurements during Multi-directional Cutting Maneuvers. Int J Sports Phys Ther 2022; 17:148-155. [PMID: 35136683 PMCID: PMC8805110 DOI: 10.26603/001c.31651] [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: 07/06/2021] [Accepted: 11/23/2021] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND Excessive knee valgus has been strongly suggested as a contributing key factor for anterior cruciate ligament (ACL) injuries. Three-dimensional (3D) motion analysis is considered the "gold standard" to assess joint kinematics, however, this is difficult for on-field assessments and for clinical setting. PURPOSE To investigate the concurrent validity of 2D measurements of knee valgus angle during cutting in different directions and to explore intra-rater and inter-rater reliability of the 2D measurements. STUDY DESIGN Descriptive laboratory study. METHOD Seven recreational soccer players participated in this study. Participants performed three trials of cutting maneuvers in three different directions (30º, 60º, and 90º) with the dominant leg. Cutting maneuvers were recorded simultaneously with a video camera and a ViconTM motion capture system. Knee valgus angle from 2D and 3D measurements at initial contact and at peak vertical ground reaction force (vGRF) were extracted. The Pearson's correlation was used to explore the relationship between the 2D and 3D measurements, and reliability of the 2D measurements were performed using intraclass correlation coefficients (ICC). RESULT Significant correlations between 2D and 3D knee valgus measurements were noted for 60º (r = 0.45) and 90º (r = 0.77) cutting maneuvers at initial contact. At peak vGRF, significant correlations between 2D and 3D knee valgus measurements were noted for 30º, 60º, and 90º cutting maneuvers (r=0.45, r=0.74, r=0.78), respectively. Good-to-excellent intra-rater and inter-rater reliability of the 2D knee valgus measurements was observed during cutting in all directions (ICCs: 0.821-0.997). CONCLUSION Moderate-to-strong correlation between 2D and 3D knee valgus measurements during 60°-90° cutting maneuvers, and good-to-excellent intra-rater and excellent inter-rater reliability for the 2D measurements in the present study supports the use of 2D knee valgus measurements in the evaluation of targeted interventions, although the limitations of examining cutting maneuvers using 2D measurement in complex movement still need to be considered. LEVEL OF EVIDENCE 3.
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Affiliation(s)
- Dimas Sondang Irawan
- Biomechanics and Sports Research unit, Faculty of Physical Therapy, Mahidol University
| | - Chantheng Huoth
- Biomechanics and Sports Research unit, Faculty of Physical Therapy, Mahidol University
| | - Komsak Sinsurin
- Biomechanics and Sports Research unit, Faculty of Physical Therapy, Mahidol University
| | | | - Roongtiwa Vachalathiti
- Musculoskeletal Physical Therapy Research unit, Faculty of Physical Therapy, Mahidol University
| | - Jim Richards
- Allied Health Research unit, University of Central Lancashire
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3
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Sonkodi B, Varga E, Hangody L, Poór G, Berkes I. Finishing stationary cycling too early after anterior cruciate ligament reconstruction is likely to lead to higher failure. BMC Sports Sci Med Rehabil 2021; 13:149. [PMID: 34823577 PMCID: PMC8613948 DOI: 10.1186/s13102-021-00377-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2021] [Accepted: 11/15/2021] [Indexed: 01/12/2023]
Abstract
Background Anterior cruciate ligament injury arises when the knee anterior ligament fibers are stretched, partially torn, or completely torn. Operated patients either end up re-injuring their reconstructed anterior cruciate ligament or majority develop early osteoarthritis regardless of the remarkable improvements of surgical techniques and the widely available rehabilitation best practices. New mechanism theories of non-contact anterior cruciate ligament injury and delayed onset muscle soreness could provide a novel perspective how to respond to this clinical challenge. Main body A tri-phasic injury model is proposed for these non-contact injuries. Mechano-energetic microdamage of the proprioceptive sensory nerve terminals is suggested to be the first-phase injury that is followed by a harsher tissue damage in the second phase. The longitudinal dimension is the third phase and that is the equivalent of the repeated bout effect of delayed onset muscle soreness. Current paper puts this longitudinal injury phase into perspective as the phase when the long-term memory consolidation and reconsolidation of this learning related neuronal injury evolves and the phase when the extent of the neuronal regeneration is determined. Reinstating the mitochondrial energy supply and ‘breathing capacity’ of the injured proprioceptive sensory neurons during this period is emphasized, as avoiding fatigue, overuse, overload and re-injury. Conclusions Extended use, minimum up to a year or even longer, of a current rehabilitation technique, namely moderate intensity low resistance stationary cycling, is recommended preferably at the end of the day. This exercise therapeutic strategy should be a supplementation to the currently used rehabilitation best practices as a knee anti-aging maintenance effort.
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Affiliation(s)
- Balázs Sonkodi
- Department of Health Sciences and Sport Medicine, University of Physical Education, Budapest, Hungary.
| | - Endre Varga
- Department of Traumatology, University of Szeged, Szeged, Hungary
| | - László Hangody
- Department of Traumatology, Semmelweis University, Budapest, Hungary
| | - Gyula Poór
- National Institute of Musculoskeletal Diseases, Budapest, Hungary.,Semmelweis University Medical School, Budapest, Hungary
| | - István Berkes
- Department of Health Sciences and Sport Medicine, University of Physical Education, Budapest, Hungary
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4
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Teng PSP, Leong KF, Kong PW. Regression model for predicting knee flexion angles using ankle plantar flexion angles, body mass index and generalised joint laxity. Sports Biomech 2021:1-16. [PMID: 34738493 DOI: 10.1080/14763141.2021.1989480] [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: 06/21/2021] [Accepted: 09/30/2021] [Indexed: 10/19/2022]
Abstract
Increased knee flexion angles are associated with reduced non-contact anterior cruciate ligament (ACL) injury risks. Ankle plantar flexion angles and internal risk factors could influence knee flexion angles, but their correlations are unknown. This study aimed to establish and validate a regression model to predict knee flexion angles using ankle plantar flexion angles, body mass index (BMI) and generalised joint laxity (GJL) at initial contact of single-leg drop landings. Thirty-two participants performed single-leg drop landings from a 30-cm-high platform. Kinematics and vertical ground reaction forces were measured using a motion capture system and force plate. A multiple regression was performed, and it was validated using a separate data set. The prediction model explained 38% (adjusted R2) of the change in knee flexion angles at initial contact (p = 0.001, large effect size). However, only the ankle plantar flexion angle (p < 0.001) was found to be a significant predictor of knee flexion angles. External validation further showed that the model explained 26% of knee flexion angles (large effect size). The inverse relationship between ankle plantar flexion and knee flexion angles suggests that foot landing strategies could be used to increase knee flexion angles, thereby reducing non-contact ACL injury risks.
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Affiliation(s)
- P S P Teng
- Institute for Sports Research, Nanyang Technological University, Singapore, Singapore
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
- Rehabilitation Research Institute of Singapore, Nanyang Technological University, Singapore, Singapore
| | - K F Leong
- Institute for Sports Research, Nanyang Technological University, Singapore, Singapore
- School of Mechanical and Aerospace Engineering, Nanyang Technological University, Singapore, Singapore
| | - P W Kong
- Institute for Sports Research, Nanyang Technological University, Singapore, Singapore
- Physical Education and Sports Science Academic Group, National Institute of Education, Nanyang Technological University, Singapore, Singapore
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Peel SA, Schroeder LE, Weinhandl JT. Effects of foot progression angle on knee mechanics during an anticipated cutting task: A statistical parametric mapping approach. J Biomech 2021; 130:110842. [PMID: 34741810 DOI: 10.1016/j.jbiomech.2021.110842] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2021] [Revised: 10/19/2021] [Accepted: 10/20/2021] [Indexed: 10/20/2022]
Abstract
Cutting is considered a "high-risk" movement for anterior cruciate ligament (ACL) injuries. It has been established that sex differences exist during cutting, placing females at greater ACL injury risk. Foot progression angle (FPA) during landing has been shown to influence lower extremity mechanics, yet little is known how FPA influences mechanics during cutting. The purpose of this study was to compare two FPA conditions during cutting between males and females. Twenty-four males and females were tested using two FPA conditions: toe-in 15° (TI15) and toe-out 15° (TO15). Right knee joint kinematic and kinetic variables were measured using a motion capture system and force plate. Five successful trials were collected and compared between FPA conditions. One-dimensional statistical parametric mapping was used to assess changes in knee mechanics between males and females over the entire stance phase. The only sex × FPA effect found was knee flexion angle. Females cutting at TI15 had decreased knee flexion angle compared TO15 (p = 0.019). Significant sex main effects included knee abduction and rotation angles, and knee flexion and rotation moments. Significant FPA main effects included knee flexion, abduction and rotation angles. The results show cutting with a toe-in FPA of 15° is enough to induce changes in knee abduction angle while cutting with 15° toe-out FPA influenced knee flexion and rotation angles. These data suggest that different cutting FPAs may be influential on known ACL injury risk variables. However, more research is warranted on cutting FPA before FPA is targeted as part of ACL injury prevention protocols.
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Affiliation(s)
- Shelby A Peel
- Department of Kinesiology, Recreation, and Sport Studies, The University of Tennessee, Knoxville, TN, United States; School of Kinesiology and Nutrition, The University of Southern Mississippi, Hattiesburg, MS, United States
| | - Lauren E Schroeder
- Department of Kinesiology, Recreation, and Sport Studies, The University of Tennessee, Knoxville, TN, United States
| | - Joshua T Weinhandl
- Department of Kinesiology, Recreation, and Sport Studies, The University of Tennessee, Knoxville, TN, United States.
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Sonkodi B, Bardoni R, Hangody L, Radák Z, Berkes I. Does Compression Sensory Axonopathy in the Proximal Tibia Contribute to Noncontact Anterior Cruciate Ligament Injury in a Causative Way?-A New Theory for the Injury Mechanism. Life (Basel) 2021; 11:443. [PMID: 34069060 PMCID: PMC8157175 DOI: 10.3390/life11050443] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2021] [Revised: 05/12/2021] [Accepted: 05/13/2021] [Indexed: 02/07/2023] Open
Abstract
Anterior cruciate ligament injury occurs when the ligament fibers are stretched, partially torn, or completely torn. The authors propose a new injury mechanism for non-contact anterior cruciate ligament injury of the knee. Accordingly, non-contact anterior cruciate ligament injury could not happen without the acute compression microinjury of the entrapped peripheral proprioceptive sensory axons of the proximal tibia. This would occur under an acute stress response when concomitant microcracks-fractures in the proximal tibia evolve due to the same excessive and repetitive compression forces. The primary damage may occur during eccentric contractions of the acceleration and deceleration moments of strenuous or unaccustomed fatiguing exercise bouts. This primary damage is suggested to be an acute compression/crush axonopathy of the proprioceptive sensory neurons in the proximal tibia. As a result, impaired proprioception could lead to injury of the anterior cruciate ligament as a secondary damage, which is suggested to occur during the deceleration phase. Elevated prostaglandin E2, nitric oxide and glutamate may have a critical neuro-modulatory role in the damage signaling in this dichotomous neuronal injury hypothesis that could lead to mechano-energetic failure, lesion and a cascade of inflammatory events. The presynaptic modulation of the primary sensory axons by the fatigued and microdamaged proprioceptive sensory fibers in the proximal tibia induces the activation of N-methyl-D-aspartate receptors in the dorsal horn of the spinal cord, through a process that could have long term relevance due to its contribution to synaptic plasticity. Luteinizing hormone, through interleukin-1β, stimulates the nerve growth factor-tropomyosin receptor kinase A axis in the ovarian cells and promotes tropomyosin receptor kinase A and nerve growth factor gene expression and prostaglandin E2 release. This luteinizing hormone induced mechanism could further elevate prostaglandin E2 in excess of the levels generated by osteocytes, due to mechanical stress during strenuous athletic moments in the pre-ovulatory phase. This may explain why non-contact anterior cruciate ligament injury is at least three-times more prevalent among female athletes.
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Affiliation(s)
- Balázs Sonkodi
- Department of Health Sciences and Sport Medicine, University of Physical Education, 1123 Budapest, Hungary;
| | - Rita Bardoni
- Department of Biomedical, Metabolic and Neural Sciences, University of Modena and Reggio Emilia, 41125 Modena, Italy;
| | - László Hangody
- Department of Traumatology, Semmelweis University, 1145 Budapest, Hungary;
| | - Zsolt Radák
- Research Center for Molecular Exercise Science, University of Physical Education, 1123 Budapest, Hungary;
| | - István Berkes
- Department of Health Sciences and Sport Medicine, University of Physical Education, 1123 Budapest, Hungary;
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7
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Lee J, Pathak P, Panday SB, Moon J. Effect of Foot-Planting Strategy on Anterior Cruciate Ligament Loading in Women During a Direction Diversion Maneuver: A Musculoskeletal Modeling Approach. Orthop J Sports Med 2020; 8:2325967120963180. [PMID: 33283003 PMCID: PMC7686614 DOI: 10.1177/2325967120963180] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Accepted: 06/03/2020] [Indexed: 11/15/2022] Open
Abstract
Background Although there is a higher prevalence of noncontact anterior cruciate ligament (ACL) injuries during a direction diversion maneuver (DDM), no previous studies have reported how foot-planting strategies affect ACL loading. Purpose To investigate the effect of foot-planting strategies on ACL loading in women during a DDM task using a musculoskeletal modeling approach. Study Design Descriptive laboratory study. Methods A total of 13 female participants performed a DDM task, which involved running at 4.5 ± 0.2 m/s and turning left at 35° to 55° under a foot-planting strategy in 3 directions: neutral, toe-in, and toe-out. Kinematic and kinetic data were measured with the use of a 3-dimensional motion capture system and force platform to calculate variables such as joint angle, shear force, and moment. Anterior ACL and posterior ACL forces were extracted using musculoskeletal modeling. Results The peak anterior ACL force was significantly larger for the toe-out condition (31.29 ± 4.02 N/body weight [BW]) compared with the toe-in condition (25.43 ± 5.68 N/BW) (P = .047), with no significant difference in the neutral condition. The toe-out condition had a higher knee valgus angle (2.98° ± 4.20°; P = .041), knee shear force (10.20 ± 1.69 N/BW; P = .009), and knee internal rotation moment (-0.18 ± 0.16 N·m/BW×height; P = .012) than the toe-in and neutral conditions. Conclusion Through musculoskeletal modeling, we were able to conclude that the toe-out condition during the DDM might result in a higher risk of ACL injuries. Athletes and sports practitioners should avoid the toe-out foot-planting strategy when participating in a sporting activity. Clinical Relevance Based on these findings, medical professionals and athletic coaches can gain knowledge on how foot-planting strategy affects ACL loading. Understanding the actual cause of an ACL injury can be useful for designing preventive training programs or strategies to decrease the risk of such injuries.
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Affiliation(s)
- Jusung Lee
- Department of Sport Science, Kangwon National University, Chuncheon, Republic of Korea
| | - Prabhat Pathak
- Department of Physical Education, Seoul National University, Seoul, Republic of Korea
| | - Siddhartha Bikram Panday
- Department of Physical Education, Seoul National University, Seoul, Republic of Korea.,Department of Sport and Leisure Studies, Keimyung University, Daegu, Republic of Korea
| | - Jeheon Moon
- Department of Physical Education, Korea National University of Education, Cheongju, Republic of Korea.,Department of Sport Science, Korea Institute of Sport Science, Seoul, Republic of Korea
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Takata Y, Sugimoto M, Iwamoto K, Kitsunai I, Sugiyama K, Kimura K. Medial Longitudinal Arch Pad Influences Landing Control of the Lower Limbs during Single-Leg Jump-Landing. Health (London) 2020. [DOI: 10.4236/health.2020.1212117] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Landis SE, Baker RT, Seegmiller JG. NON-CONTACT ANTERIOR CRUCIATE LIGAMENT AND LOWER EXTREMITY INJURY RISK PREDICTION USING FUNCTIONAL MOVEMENT SCREEN AND KNEE ABDUCTION MOMENT: AN EPIDEMIOLOGICAL OBSERVATION OF FEMALE INTERCOLLEGIATE ATHLETES. Int J Sports Phys Ther 2018; 13:973-984. [PMID: 30534463 PMCID: PMC6253749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023] Open
Abstract
BACKGROUND Modifiable risk factors associated with non-contact anterior cruciate ligament (ACL) injuries are highly debated, yet the incidence rate of ACL injury continues to increase. Measures of movement quality may be an effective method for identifying individuals who are at a high risk of injury. PURPOSE The purpose of this study was to investigate whether a movement screen and/or a drop-jump landing (DJL) task identifies female individuals at a higher risk for sustaining non-contact lower extremity (LE) injuries, particularly ACL injuries. STUDY DESIGN Cohort study. METHODS 187 women (mean age 19.5 ± 1.21 years) who played collegiate soccer, volleyball, or basketball completed the Functional Movement Screen (FMS™) and a drop-jump landing task. Weekly injury reports of participants who sustained a non-contact LE injury were collected. FMS™ scores (both total score and individual screens) and Knee Abduction Moment (KAM) values from the DJL task, were compared between injured and uninjured sample populations. RESULTS A statistically significant difference (t = 1.98, p = 0.049) was observed in the FMS™ scores between the injured (ACL and LE injury) and uninjured groups. Prior ACL injury was also a significant predictor of LE injury (OR = 4.4, p = 0.01). CONCLUSIONS The FMS™ can be used to identify collegiate female athletes who are at an increased risk of sustaining a non-contact ACL or LE injury. Female collegiate athletes that score 14 or less on the FMS™ have a greater chance of sustaining a non-contact LE injury than those who score above 14. LEVEL OF EVIDENCE 3b.
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Teng PSP, Kong PW, Leong KF. Effects of foot rotation positions on knee valgus during single-leg drop landing: Implications for ACL injury risk reduction. Knee 2017; 24:547-554. [PMID: 28336150 DOI: 10.1016/j.knee.2017.01.014] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 01/09/2017] [Accepted: 01/13/2017] [Indexed: 02/02/2023]
Abstract
BACKGROUND Non-contact anterior cruciate ligament (ACL) injuries commonly occur when athletes land in high risk positions such as knee valgus. The position of the foot at landing may influence the transmission of forces from the ankle to the knee. Using an experimental approach to manipulate foot rotation positions, this study aimed to provide new insights on how knee valgus during single-leg landing may be influenced by foot positions. METHODS Eleven male recreational basketball players performed single-leg drop landings from a 30-cm high platform in three foot rotation positions (toe-in, toe-forward and toe-out) at initial contact. A motion capture system and a force plate were used to measure lower extremity kinematics and kinetics. Knee valgus angles at initial contact (KVA) and maximum knee valgus moments (KVM), which were known risk factors associated with ACL injury, were measured. A one-way repeated measures Analysis of Variance was conducted (α=0.05) to compare among the three foot positions. RESULTS Foot rotation positions were found to have a significant effect on KVA (p<0.001, η2=0.66) but the difference between conditions (about 1°) was small and not clinically meaningful. There was a significant effect of foot position on KVM (p<0.001, η2=0.55), with increased moment observed in the toe-out position as compared to toe-forward (p=0.012) or toe-in positions (p=0.002). CONCLUSIONS When landing with one leg, athletes should avoid extreme toe-out foot rotation positions to minimise undesirable knee valgus loading associated with non-contact ACL injury risks.
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Affiliation(s)
- P S P Teng
- Institute for Sports Research, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
| | - P W Kong
- Institute for Sports Research, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; Physical Education and Sports Science Academic Group, National Institute of Education, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616, Singapore.
| | - K F Leong
- Institute for Sports Research, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore; School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore.
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