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Arnaert S, Byttebier P, Van Rossom S, Vereecke E, Jonkers I, Oei E, Bierma-Zeinstra SM, Lories R, van Middelkoop M, Clockaerts S. Anterior Tibiotalar Fat Pad Involvement in Ankle Osteoarthritis: MRI Features in Patients 1 Year After a Lateral Ankle Sprain. Cartilage 2023; 14:285-291. [PMID: 37013994 PMCID: PMC10601560 DOI: 10.1177/19476035231161786] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 02/12/2023] [Accepted: 02/17/2023] [Indexed: 04/05/2023] Open
Abstract
OBJECTIVE To investigate the characteristics of the anterior tibiotalar fat pad (ATFP) in the ankle joint in a population of patients 1 year after an ankle sprain and its correlation with systemic factors and local articular pathology. DESIGN The study is a secondary analysis of an observational case-control study. We included 206 patients who were followed 6-12 months after ankle sprain. T1 MRI scans were assessed for signal intensity and area of ATFP by mapping the fat pad using dedicated imaging software (Mimics 18.0). Quantitative values of intensity and area were generated. Linear regression analysis was used to examine the association between both local and systemic factors and the ATFP. Variables with a P value <0.2 were entered in 5 stepwise multivariate models: (1) age-sex-body mass index (BMI); (2) anamnesis; (3) physical examination; (4) radiographic findings; and (5) MRI findings. Predictors in these separate models were entered in the final model. RESULTS The final multivariate model showed a significant positive association between age (P = 0.04; 95% confidence interval [CI] = 1.13 ± 1.06), BMI (P = 0.05; 95% CI = 3.61 ± 3.53), and sex (P < 0.01; 95% CI = -49.26 ± 30.04) with T1 intensity. The final model also showed a significant negative association between age (P < 0.01; 95% CI = -0.57 ± 0.34), diffuse cartilage loss in the lateral talus (P = 0.03; 95% CI = -0.71 ± 0.63), and Kellgren and Lawrence score in the tibiotalar joint (P < 0.01; 95%CI = -21.61 ± 7.24) and ATFP area. A positive association was found between BMI (P < 0.01; 95% CI = 2.25 ± 1.15) and ATFP area. CONCLUSION This study demonstrates a correlation between ATFP and both systemic factors and local pathology in the ankle joint.
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Affiliation(s)
- Stijn Arnaert
- Division of Internal Medicine, University Hospitals Leuven, Leuven, Belgium
| | - Paul Byttebier
- Orthopedic Surgery and Traumatology, General Municipal Hospital Aalst, Aalst, Belgium
| | - Sam Van Rossom
- Human Movement Biomechanics Research Group, KU Leuven, Leuven, Belgium
| | - Evie Vereecke
- Department of Development and Regeneration, KU Leuven, Kortrijk, Belgium
| | - Ilse Jonkers
- Human Movement Biomechanics Research Group, KU Leuven, Leuven, Belgium
| | - Edwin Oei
- Radiology & Nuclear Medicine, Erasmus University Medical Center, Rotterdam, The Netherlands
| | | | - Rik Lories
- Division of Rheumatology, University Hospitals Leuven, Leuven, Belgium
- Department of Development and Regeneration, Skeletal Biology and Engineering Research Center, KU Leuven, Leuven, Belgium
| | | | - Stefan Clockaerts
- Department of Development and Regeneration, Skeletal Biology and Engineering Research Center, KU Leuven, Leuven, Belgium
- Department of Othopedic Surgery and Traumatology, Hospital of Lier, Lier, Belgium
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2
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Sacher SE, Neri JP, Gao MA, Argentieri EC, Potter HG, Koch KM, Koff MF. MAVRIC based T2 mapping assessment of infrapatellar fat pad scarring in patients with total knee arthroplasty. J Orthop Res 2023; 41:1299-1309. [PMID: 36262013 PMCID: PMC10113607 DOI: 10.1002/jor.25472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/01/2022] [Revised: 09/06/2022] [Accepted: 10/18/2022] [Indexed: 02/04/2023]
Abstract
The infrapatellar fat pad (IPFP) has been implicated as a source of postoperative knee pain. Imaging the IPFP is challenging in patients with total knee arthroplasty (TKA) due to metallic susceptibility artifact. Multi-Acquisition Variable-Resonance Image Combination (MAVRIC)-based T2 Mapping has been developed to mitigate this artifact and can generate quantitative T2 data. Objectives of this study were to (1) measure T2 values of the IPFP in patients with TKAs using a MAVRIC based T2 mapping technique and (2) determine if IPFP T2 values are related to the degree of fat pad scarring or clinical magnetic resonance imaging (MRI) findings. Twenty-eight subjects (10 males, 18 females, Age: 66 + 7.2 years [Mean ± standard deviations]) undergoing clinical MRIs were sequentially recruited. Morphological imaging and quantitative T2 mapping sequences were performed on a clinical 1.5 T scanner. The morphologic images were graded for the presence and severity of fat pad scarring and clinical outcomes. T2 values were calculated in the total fat pad volume, a normal regions of interest (ROI), and an abnormal ROI. T2 values were shortened in the total IPFP volume (p = 0.001) and within abnormal regions (p = 0.003) in subjects with more severe IPFP scarring. The difference between T2 values in normal-abnormal regions was greater in subjects with severe versus no scarring (+1426.1%, p = 0.008). T2 values were elevated in patients with MRI findings of osteolysis (+32.3%, p = 0.02). These findings indicate that MAVRIC-based T2 Mapping may be used as a quantitative biomarker of postoperative IPFP scarring in individuals following TKA.
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Affiliation(s)
- Sara E. Sacher
- Hospital for Special Surgery, 535 East 70th St, New York, NY 10021
| | - John P. Neri
- Hospital for Special Surgery, 535 East 70th St, New York, NY 10021
| | - Madeleine A. Gao
- Hospital for Special Surgery, 535 East 70th St, New York, NY 10021
| | | | - Hollis G. Potter
- Hospital for Special Surgery, 535 East 70th St, New York, NY 10021
| | | | - Matthew F. Koff
- Hospital for Special Surgery, 535 East 70th St, New York, NY 10021
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3
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Nakagawa Y, Tsuji K, Nakamura T, Katagiri H, Ozeki N, Shioda M, An JS, Yoshida R, Sekiya I, Koga H. Association of Infrapatellar Fat Pad Fibrosis at 3 Months After ACL Reconstruction With Short-term Clinical Outcomes and Inflammatory Cytokine Levels in the Synovial Fluid. Orthop J Sports Med 2023; 11:23259671231164122. [PMID: 37123994 PMCID: PMC10134128 DOI: 10.1177/23259671231164122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2022] [Accepted: 01/17/2023] [Indexed: 05/02/2023] Open
Abstract
Background Infrapatellar fat pad (IFP) fibrosis is reportedly associated with anterior knee pain and the progression of patellofemoral osteoarthritis after anterior cruciate ligament reconstruction (ACLR). However, causes of IFP fibrosis after ACLR have not been sufficiently investigated. Purpose To compare the descriptive characteristics, clinical outcomes, and inflammatory cytokine levels in the synovial fluid between patients who underwent ACLR with versus without severe IFP fibrosis. Study Design Cohort study; Level of evidence, 3. Methods Patients who underwent primary ACLR using autologous hamstring tendon were divided into 2 groups based on magnetic resonance imaging IFP fibrosis scoring (grades 0-5) at 3 months after surgery: the severe fibrosis group (grades 4 and 5) and mild fibrosis group (grades 0-3). Synovial fluid was aspirated on postoperative day 3 or 4 to measure inflammatory cytokine levels. Patient characteristics, clinical outcomes at 3 and 12 months after surgery, and inflammatory cytokine (interleukin [IL]-1β, IL-2, IL-6, IL-8, IL-10, tumor necrosis factor-α, and interferon-γ) levels were compared between the groups. Results Of the 36 patients included, 7 were allocated to the severe fibrosis group and 29 were allocated to the mild fibrosis group. The severe fibrosis group had a significantly longer operation time (153.0 vs 116.5 minutes for mild fibrosis; P = .007). Compared with the mild fibrosis group, the severe fibrosis group had greater pain during stair climbing (2.0 vs 0.7; P = .01) and a lower extension muscle strength ratio (operated/healthy side, 52.9% vs 76.1%; P < .001) at 3 months, and the severe fibrosis group had a lower Lysholm score (93.7 vs 97.3; P = .026) and greater knee extension (0.3° vs 1.9°; P = .043) and flexion angle restriction (142.9° vs 149.0°; P = .013) at 12 months. The severe fibrosis group demonstrated higher IL-1β (2.6 vs 1.4 pg/mL; P = .022), IL-6 (2.0 vs 1.1 ng/mL; P = .029), and interferon-γ levels (11.3 vs 4.0 pg/mL; P = .044). Conclusion Severe IFP fibrosis was associated with a longer operation time, higher inflammatory cytokine level in the synovial fluid, and worse clinical outcomes at 3 and 12 months after ACLR.
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Affiliation(s)
- Yusuke Nakagawa
- Department of Orthopaedic Surgery,
Tokyo Medical and Dental University Hospital of Medicine, Tokyo, Japan
- Department of Cartilage Regeneration,
Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University,
Tokyo, Japan
| | - Kunikazu Tsuji
- Department of Orthopaedic Surgery,
Tokyo Medical and Dental University Hospital of Medicine, Tokyo, Japan
- Department of Cartilage Regeneration,
Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University,
Tokyo, Japan
| | - Tomomasa Nakamura
- Department of Orthopaedic Surgery,
Tokyo Medical and Dental University Hospital of Medicine, Tokyo, Japan
- Department of Joint Surgery and Sports
Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental
University, Tokyo, Japan
| | - Hiroki Katagiri
- Department of Orthopaedic Surgery,
Tokyo Medical and Dental University Hospital of Medicine, Tokyo, Japan
| | - Nobutake Ozeki
- Department of Orthopaedic Surgery,
Tokyo Medical and Dental University Hospital of Medicine, Tokyo, Japan
| | - Mikio Shioda
- Department of Orthopaedic Surgery,
Tokyo Medical and Dental University Hospital of Medicine, Tokyo, Japan
| | - Jae-Sung An
- Department of Orthopaedic Surgery,
Tokyo Medical and Dental University Hospital of Medicine, Tokyo, Japan
- Department of Joint Surgery and Sports
Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental
University, Tokyo, Japan
| | - Ryu Yoshida
- Department of Orthopaedic Surgery,
Tokyo Medical and Dental University Hospital of Medicine, Tokyo, Japan
- Department of Joint Surgery and Sports
Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental
University, Tokyo, Japan
| | - Ichiro Sekiya
- Department of Orthopaedic Surgery,
Tokyo Medical and Dental University Hospital of Medicine, Tokyo, Japan
| | - Hideyuki Koga
- Department of Orthopaedic Surgery,
Tokyo Medical and Dental University Hospital of Medicine, Tokyo, Japan
- Department of Joint Surgery and Sports
Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental
University, Tokyo, Japan
- Hideyuki Koga, MD, PhD,
Department of Joint Surgery and Sports Medicine, Graduate School of Medical and
Dental Sciences, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku,
Tokyo 113-8519, Japan ()
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Hart DA. Osteoarthritis as an Umbrella Term for Different Subsets of Humans Undergoing Joint Degeneration: The Need to Address the Differences to Develop Effective Conservative Treatments and Prevention Strategies. Int J Mol Sci 2022; 23:ijms232315365. [PMID: 36499704 PMCID: PMC9736942 DOI: 10.3390/ijms232315365] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 11/30/2022] [Accepted: 12/04/2022] [Indexed: 12/12/2022] Open
Abstract
Osteoarthritis (OA) of joints such as the knee and hip are very prevalent, and the number of individuals affected is expected to continue to rise. Currently, conservative treatments after OA diagnosis consist of a series of increasingly invasive interventions as the degeneration and pain increase, leading very often to joint replacement surgery. Most interventions are focused on alleviating pain, and there are no interventions currently available that stop and reverse OA-associated joint damage. For many decades OA was considered a disease of cartilage, but it is now considered a disease of the whole multi-tissue joint. As pain is the usual presenting symptom, for most patients, it is not known when the disease process was initiated and what the basis was for the initiation. The exception is post-traumatic OA which results from an overt injury to the joint that elevates the risk for OA development. This scenario leads to very long wait lists for joint replacement surgery in many jurisdictions. One aspect of why progress has been so slow in addressing the needs of patients is that OA has been used as an umbrella term that does not recognize that joint degeneration may arise from a variety of mechanistic causes that likely need separate analysis to identify interventions unique to each subtype (post-traumatic, metabolic, post-menopausal, growth and maturation associated). A second aspect of the slow pace of progress is that the bulk of research in the area is focused on post-traumatic OA (PTOA) in preclinical models that likely are not clearly relevant to human OA. That is, only ~12% of human OA is due to PTOA, but the bulk of studies investigate PTOA in rodents. Thus, much of the research community is failing the patient population affected by OA. A third aspect is that conservative treatment platforms are not specific to each OA subset, nor are they integrated into a coherent fashion for most patients. This review will discuss the literature relevant to the issues mentioned above and propose some of the directions that will be required going forward to enhance the impact of the research enterprise to affect patient outcomes.
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Affiliation(s)
- David A Hart
- Department of Surgery, Faculty of Kinesiology, McCaig Institute for Bone & Joint Health, University of Calgary, Calgary, AB T2N 4N1, Canada
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5
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Maeztu Redin D, Caroux J, Rohan PY, Pillet H, Cermolacce A, Trnka J, Manassero M, Viateau V, Corté L. A wear model to predict damage of reconstructed ACL. J Mech Behav Biomed Mater 2022; 136:105426. [PMID: 36208581 DOI: 10.1016/j.jmbbm.2022.105426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Revised: 08/07/2022] [Accepted: 08/20/2022] [Indexed: 11/28/2022]
Abstract
Impingement with surrounding tissues is a major cause of failure of anterior cruciate ligament reconstruction. However, the complexity of the knee kinematics and anatomical variations make it difficult to predict the occurrence of contact and the extent of the resulting damage. Here we hypothesise that a description of wear between the reconstructed ligament and adjacent structures captures the in vivo damage produced with physiological loadings. To test this, we performed an in vivo study on a sheep model and investigated the role of different sources of damage: overstretching, excessive twist, excessive compression, and wear. Seven sheep underwent cranial cruciate ligament reconstruction using a tendon autograft. Necropsy observations and pull-out force measurements performed postoperatively at three months showed high variability across specimens of the extent and location of graft damage. Using 3D digital models of each stifle based on X-ray imaging and kinematics measurements, we determined the relative displacements between the graft and the surrounding bones and computed a wear index describing the work of friction forces underwent by the graft during a full flexion-extension movement. While tensile strain, angle of twist and impingement volume showed no correlation with pull-out force (ρ = -0.321, p = 0.498), the wear index showed a strong negative correlation (r = -0.902, p = 0.006). Moreover, contour maps showing the distribution of wear on the graft were consistent with the observations of damage during the necropsy. These results demonstrate that wear is a good proxy of graft damage. The proposed wear index could be used in implant design and surgery planning to minimise the risk of implant failure. Its application to sheep can provide a way to increase preclinical testing efficiency.
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Affiliation(s)
- Deyo Maeztu Redin
- Centre des Matériaux, Mines Paris, PSL University, Évry, France; Molecular, Macromolecular Chemistry and Materials, ESPCI Paris, PSL University, Paris, France.
| | - Julien Caroux
- Centre des Matériaux, Mines Paris, PSL University, Évry, France; Molecular, Macromolecular Chemistry and Materials, ESPCI Paris, PSL University, Paris, France
| | - Pierre-Yves Rohan
- Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers Institute of Technology, Paris, France
| | - Hélène Pillet
- Institut de Biomécanique Humaine Georges Charpak, Arts et Métiers Institute of Technology, Paris, France
| | - Alexia Cermolacce
- Ecole Nationale Vétérinaire d'Alfort, Université Paris Est Sup, France
| | - Julien Trnka
- Ecole Nationale Vétérinaire d'Alfort, Université Paris Est Sup, France
| | - Mathieu Manassero
- Ecole Nationale Vétérinaire d'Alfort, Université Paris Est Sup, France; Laboratoire de Biologie, Bioingénierie et Bioimagerie Ostéo-Articulaire, UMR CNRS 7052, INSERM U1271, 75010, Paris, France
| | - Véronique Viateau
- Ecole Nationale Vétérinaire d'Alfort, Université Paris Est Sup, France; Laboratoire de Biologie, Bioingénierie et Bioimagerie Ostéo-Articulaire, UMR CNRS 7052, INSERM U1271, 75010, Paris, France
| | - Laurent Corté
- Centre des Matériaux, Mines Paris, PSL University, Évry, France; Molecular, Macromolecular Chemistry and Materials, ESPCI Paris, PSL University, Paris, France
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6
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Merkely G, Ackermann J, Sheehy E, Gomoll AH. Does Flipping the Tubercle for Improved Cartilage Repair Exposure Increase the Risk for Arthrofibrosis? Cartilage 2021; 13:311S-317S. [PMID: 33095040 PMCID: PMC8808929 DOI: 10.1177/1947603520968209] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
OBJECTIVE We sought to determine whether rates of postoperative arthrofibrosis following tibial tuberosity osteotomy (TTO) with complete mobilization of the fragment (TTO-HD) are comparable to TTOs where the hinge remained intact (TTO-HI). DESIGN Patients who underwent TTO with concomitant cartilage repair procedure between January 2007 and May 2017, with at least 2 years of follow-up were included in this study. Postoperative reinterventions following TTO-HD and TTO-HI were assessed and multivariant logistic regression models were used to identify whether postoperative reinterventions can be attributed to either technique when controlled for defect size or defect number. RESULTS A total of 127 patients (TTO-HD, n = 80; TTO-HI, n = 47) were included in this study. Significantly more patients in the TTO-HD group (31.2%) developed postoperative arthrofibrosis compared with TTO-HI (6.4%; P < 0.05). Multivariant logistic regression revealed that TTO-HD is an independent risk factor for predicting postoperative arthrofibrosis (OR 6.5, CI = 1.7-24.2, P < 0.05). CONCLUSION Patients who underwent TTO with distal hinge detachment and a proximally flipped tubercle for better exposure during concomitant cartilage repair were at a significantly higher risk of postoperative arthrofibrosis than patients with similar size and number of defects treated without mobilization of the tubercle. While certain procedures can benefit from larger exposure, surgeons should be aware of the increased risk of postoperative arthrofibrosis. LEVEL OF EVIDENCE Level III, case-control study.
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Affiliation(s)
- Gergo Merkely
- Department of Orthopaedic Surgery,
Division of Sports Medicine, Center for Cartilage Repair, Brigham and Women’s
Hospital, Harvard Medical School, Boston, MA, USA,Gergo Merkely, Department of Orthopaedic
Surgery, Division of Sports Medicine, Center for Cartilage Repair, Brigham and
Women’s Hospital, Harvard Medical School, 75 Francis Street, Boston, MA 02115,
USA.
| | - Jakob Ackermann
- Sports Medicine Center, Massachusetts
General Hospital, Boston, MA, USA
| | - Emily Sheehy
- Department of Orthopaedic Surgery,
Division of Sports Medicine, Center for Cartilage Repair, Brigham and Women’s
Hospital, Harvard Medical School, Boston, MA, USA
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7
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Wallace KG, Pfeiffer SJ, Pietrosimone LS, Harkey MS, Zong X, Nissman D, Kamath GM, Creighton RA, Spang JT, Blackburn JT, Pietrosimone B. Changes in Infrapatellar Fat Pad Volume 6 to 12 Months After Anterior Cruciate Ligament Reconstruction and Associations With Patient-Reported Knee Function. J Athl Train 2021; 56:1173-1179. [PMID: 33787883 PMCID: PMC8582630 DOI: 10.4085/1062-6050-0458.20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
CONTEXT Hypertrophy of the infrapatellar fat pad (IFP) in idiopathic knee osteoarthritis has been linked to deleterious synovial changes and joint pain related to mechanical tissue impingement. Yet little is known regarding the IFP's volumetric changes after anterior cruciate ligament reconstruction (ACLR). OBJECTIVES To examine changes in IFP volume between 6 and 12 months after ACLR and determine associations between patient-reported outcomes and IFP volume at each time point as well as the volume change over time. In a subset of individuals, we examined interlimb IFP volume differences 12 months post-ACLR. STUDY DESIGN Prospective cohort study. SETTING Laboratory. PATIENTS OR OTHER PARTICIPANTS We studied 26 participants (13 women, 13 men, age = 21.88 ± 3.58 years, body mass index = 23.82 ± 2.21 kg/m2) for our primary aims and 13 of those participants (8 women, 5 men, age = 21.15 ± 3.85 years, body mass index = 23.01 ± 2.01 kg/m2) for our exploratory aim. MAIN OUTCOME MEASURE(S) Using magnetic resonance imaging, we evaluated the IFP volume change between 6 and 12 months post-ACLR in the ACLR limb and between-limbs differences at 12 months in a subset of participants. International Knee Documentation Committee subjective knee evaluation (IKDC) scores were collected at 6-month and 12-month follow-ups, and associations between IFP volume and patient-reported outcomes were determined. RESULTS The IFP volume in the ACLR limb increased from 6 months (19.67 ± 6.30 cm3) to 12 months (21.26 ± 6.91 cm3) post-ACLR. Greater increases of IFP volume between 6 and 12 months were significantly associated with better 6-month IKDC scores (r = .44, P = .03). The IFP volume was greater in the uninjured limb (22.71 ± 7.87 cm3) than in the ACLR limb (20.75 ± 9.03 cm3) 12 months post-ACLR. CONCLUSIONS The IFP volume increased between 6 and 12 months post-ACLR; however, the IFP volume of the ACLR limb remained smaller than that of the uninjured limb at 12 months. In addition, those with better knee function 6 months post-ACLR demonstrated greater increases in IFP volume between 6 and 12 months post-ACLR. This suggests that greater IFP volumes may play a role in long-term joint health after ACLR.
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Affiliation(s)
- Kyle G Wallace
- Georgetown University School of Medicine, Washington, DC
- MOTION Science Institute, Department of Exercise and Sport Science, University of North Carolina at Chapel Hill
| | - Steven J Pfeiffer
- MOTION Science Institute, Department of Exercise and Sport Science, University of North Carolina at Chapel Hill
- Ohio Musculoskeletal and Neurological Institute (OMNI), Ohio University, Athens
- School of Applied Health Sciences and Wellness, Ohio University, Athens
| | - Laura S Pietrosimone
- Department of Orthopaedic Surgery, School of Medicine, Duke University, Durham, NC
| | - Matthew S Harkey
- Department of Kinesiology, Michigan State University, East Lansing
| | - Xiaopeng Zong
- Department of Radiology, University of North Carolina at Chapel Hill
- Biomedical Research Imaging Center, School of Medicine, University of North Carolina at Chapel Hill
| | - Daniel Nissman
- Department of Radiology, University of North Carolina at Chapel Hill
| | - Ganesh M Kamath
- Department of Orthopaedics, University of North Carolina at Chapel Hill
| | | | - Jeffrey T Spang
- Department of Orthopaedics, University of North Carolina at Chapel Hill
| | - J Troy Blackburn
- MOTION Science Institute, Department of Exercise and Sport Science, University of North Carolina at Chapel Hill
- Department of Orthopaedics, University of North Carolina at Chapel Hill
- Human Movement Science Curriculum, University of North Carolina at Chapel Hill
| | - Brian Pietrosimone
- MOTION Science Institute, Department of Exercise and Sport Science, University of North Carolina at Chapel Hill
- Department of Orthopaedics, University of North Carolina at Chapel Hill
- Human Movement Science Curriculum, University of North Carolina at Chapel Hill
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8
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Barton KI, Heard BJ, Kroker A, Sevick JL, Raymond DA, Chung M, Achari Y, Martin CR, Frank CB, Boyd SK, Shrive NG, Hart DA. Structural Consequences of a Partial Anterior Cruciate Ligament Injury on Remaining Joint Integrity: Evidence for Ligament and Bone Changes Over Time in an Ovine Model. Am J Sports Med 2021; 49:637-648. [PMID: 33523721 DOI: 10.1177/0363546520985279] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Severe injury to the knee joint often results in accelerated posttraumatic osteoarthritis (PTOA). In an ovine knee injury model, altered kinematics and degradation of the cartilage have been observed at 20 and 40 weeks after partial anterior cruciate ligament (ACL) transection (p-ACL Tx) surgery. However, changes to the integrity of the remaining intact intra-articular ligaments (posterolateral [PL] band and posterior cruciate ligament [PCL]) as well as the subchondral bone after anteromedial (AM) band Tx remain to be characterized. PURPOSE (1) To investigate histological alterations to the remaining intact intra-articular ligaments, the synovium, and the infrapatellar fat pad (IPFP) and (2) to quantify subchondral bone changes at the contact surfaces of the proximal tibia at 20 and 40 weeks after AM band Tx. STUDY DESIGN Descriptive laboratory study. METHODS Mature female Suffolk cross sheep were allocated into 3 groups: nonoperative controls (n = 6), 20 weeks after partial ACL transection (p-ACL Tx; n = 5), and 40 weeks after p-ACL Tx (n = 6). Ligament, synovium, and IPFP sections were stained and graded. Tibial subchondral bone microarchitecture was assessed using high-resolution peripheral quantitative computed tomography. RESULTS p-ACL Tx of the AM band led to significant change in histological scores of the PL band and the PCL at 20 weeks after p-ACL Tx (P = .031 and P = .033, respectively) and 40 weeks after p-ACL Tx (P = .011 and P = .029) as compared with nonoperative controls. Alterations in inflammatory cells and collagen fiber orientation contributed to the greatest extent of the combined histological score in the PL band and PCL. p-ACL Tx did not lead to chronic activation of the synovium or IPFP. Trabecular bone mineral density was strongly inversely correlated with combined gross morphological damage in the top and middle layers of the subchondral bone in the lateral tibial plateau for animals at 40 weeks after p-ACL Tx. CONCLUSION p-ACL Tx influences the integrity (biology and structure) of remaining intact intra-articular ligaments and bone microarchitecture in a partial knee injury ovine model. CLINICAL RELEVANCE p-ACL Tx leads to alterations in structural integrity of the remaining intact ligaments and degenerative changes in the trabecular bone mineral density, which may be detrimental to the injured athlete's knee joint in the long term.
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Affiliation(s)
- Kristen I Barton
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada.,Faculty of Kinesiology, University of Calgary, Calgary, Canada
| | - Bryan J Heard
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - Andres Kroker
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada.,Schulich School of Engineering, University of Calgary, Calgary, Canada
| | - Johnathan L Sevick
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada.,Schulich School of Engineering, University of Calgary, Calgary, Canada
| | - Duncan A Raymond
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - May Chung
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - Yamini Achari
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - C Ryan Martin
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada.,Section of Orthopaedics, Foothills Hospital, Calgary, Canada
| | | | - Steven K Boyd
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada.,Schulich School of Engineering, University of Calgary, Calgary, Canada
| | - Nigel G Shrive
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada.,Schulich School of Engineering, University of Calgary, Calgary, Canada
| | - David A Hart
- McCaig Institute for Bone and Joint Health, Cumming School of Medicine, University of Calgary, Calgary, Canada.,Faculty of Kinesiology, University of Calgary, Calgary, Canada.,Bone and Joint Health Strategic Clinical Network, Alberta Health Services, Edmonton, Canada
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Flexibility of infrapatellar fat pad affecting anterior knee pain 6 months after anterior cruciate ligament reconstruction with hamstring autograft. Sci Rep 2020; 10:21347. [PMID: 33288779 PMCID: PMC7721795 DOI: 10.1038/s41598-020-78406-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 11/19/2020] [Indexed: 11/21/2022] Open
Abstract
This study aimed to identify factors affecting anterior knee pain (AKP) after anterior cruciate ligament reconstruction (ACLR) with hamstring tendon autograft using ultrasonography. Forty-two patients were evaluated by ultrasound, 6 months after ACLR. The thickness of the superficial part of the infrapatellar fat pad was measured, as well as the thickness change ratio between the two angles. Color Doppler evaluated the rate of blood flow in the fat pad. AKP was assessed with the Kujala Scale. The correlations between AKP and age, body mass index, the thickness change ratio, and the grade of increased blood flow were examined. Independent variables showing significant correlations with AKP were used for multiple linear regression analysis. There were significant correlations between AKP and age (r = − 0.68), body mass index (r = − 0.37), the thickness change ratio of the fat pad (r = 0.73) and the grade of increased blood flow (r = − 0.42), respectively. Age and the thickness change ratio of the fat pad affected the AKP score (R2 = 0.56). After ACLR, older age and a decrease in the thickness change ratio of the superficial area of the infrapatellar fat pad appear to affect post-operative AKP after 6 months.
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10
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Barbosa GM, Cunha JE, Russo TL, Cunha TM, Castro PATS, Oliveira FFB, Cunha FQ, Ramalho FS, Salvini TF. Thirty days after anterior cruciate ligament transection is sufficient to induce signs of knee osteoarthritis in rats: pain, functional impairment, and synovial inflammation. Inflamm Res 2020; 69:279-288. [PMID: 32006078 DOI: 10.1007/s00011-020-01317-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 12/15/2019] [Accepted: 01/08/2020] [Indexed: 01/15/2023] Open
Abstract
OBJECTIVE To compare the unilateral signs of knee osteoarthritis (KOA) 30 and 60 days after anterior cruciate ligament transection (ACLT). Pain, gait function, synovial fluid inflammation, and histopathological changes in the synovial membrane were analyzed, as well as the interaction between the variables. MATERIALS AND METHODS Male Wistar rats (n = 32; 219.2 ± 18.6 g) were randomly distributed into four groups of eight animals each. Two groups were submitted to unilateral ACLT surgery to induce KOA and analyzed after 30 (KOA30) and 60 days (KOA60). Two control groups (without surgery) were also assessed after the same time periods (C30 and C60). All the groups were evaluated before ACLT from the least to most stressful tests (skin temperature, mechanical response threshold, gait test, thermal response threshold, and joint swelling), as well as 30 and 60 days after surgery. After euthanasia, the synovial fluid and synovial membrane were collected. RESULTS Thirty days after ACLT, KOA30 showed decrease paw print area and mechanical response threshold, higher joint swelling, skin temperature, leukocyte count, cytokine levels, and synovitis score. No differences were found between KOA30 and KOA60. CONCLUSION Our data showed that 30 days after ACLT is sufficient to induce signs of KOA in rats, such as pain, functional impairment, and synovial inflammation, suggesting that a shorter time period can be used as an experimental model.
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Affiliation(s)
- Germanna M Barbosa
- Department of Physical Therapy, Federal University of São Carlos, São Carlos, SP, Brazil
| | - Jonathan E Cunha
- Department of Physical Therapy, Federal University of São Carlos, São Carlos, SP, Brazil
| | - Thiago L Russo
- Department of Physical Therapy, Federal University of São Carlos, São Carlos, SP, Brazil
| | - Thiago M Cunha
- Department of Pharmacology, University of Sao Paulo, Ribeirão Preto, SP, Brazil
| | - Paula A T S Castro
- Department of Physical Therapy, Federal University of São Carlos, São Carlos, SP, Brazil
| | | | - Fernando Q Cunha
- Department of Pharmacology, University of Sao Paulo, Ribeirão Preto, SP, Brazil
| | - Fernando S Ramalho
- Department of Pathology and Forensic Medicine, University of Sao Paulo, Ribeirão Preto, SP, Brazil
| | - Tania F Salvini
- Department of Physical Therapy, Federal University of São Carlos, São Carlos, SP, Brazil. .,Laboratório de Plasticidade Muscular, Departamento de Fisioterapia, Universidade Federal de São Carlos, Rodovia Washington Luiz, Km 235, São Carlos, SP, 13565-905, Brazil.
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11
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Usher KM, Zhu S, Mavropalias G, Carrino JA, Zhao J, Xu J. Pathological mechanisms and therapeutic outlooks for arthrofibrosis. Bone Res 2019; 7:9. [PMID: 30937213 PMCID: PMC6433953 DOI: 10.1038/s41413-019-0047-x] [Citation(s) in RCA: 122] [Impact Index Per Article: 24.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2018] [Revised: 02/17/2019] [Accepted: 02/26/2019] [Indexed: 02/07/2023] Open
Abstract
Arthrofibrosis is a fibrotic joint disorder that begins with an inflammatory reaction to insults such as injury, surgery and infection. Excessive extracellular matrix and adhesions contract pouches, bursae and tendons, cause pain and prevent a normal range of joint motion, with devastating consequences for patient quality of life. Arthrofibrosis affects people of all ages, with published rates varying. The risk factors and best management strategies are largely unknown due to a poor understanding of the pathology and lack of diagnostic biomarkers. However, current research into the pathogenesis of fibrosis in organs now informs the understanding of arthrofibrosis. The process begins when stress signals stimulate immune cells. The resulting cascade of cytokines and mediators drives fibroblasts to differentiate into myofibroblasts, which secrete fibrillar collagens and transforming growth factor-β (TGF-β). Positive feedback networks then dysregulate processes that normally terminate healing processes. We propose two subtypes of arthrofibrosis occur: active arthrofibrosis and residual arthrofibrosis. In the latter the fibrogenic processes have resolved but the joint remains stiff. The best therapeutic approach for each subtype may differ significantly. Treatment typically involves surgery, however, a pharmacological approach to correct dysregulated cell signalling could be more effective. Recent research shows that myofibroblasts are capable of reversing differentiation, and understanding the mechanisms of pathogenesis and resolution will be essential for the development of cell-based treatments. Therapies with significant promise are currently available, with more in development, including those that inhibit TGF-β signalling and epigenetic modifications. This review focuses on pathogenesis of sterile arthrofibrosis and therapeutic treatments.
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Affiliation(s)
- Kayley M. Usher
- School of Biomedical Sciences, University of Western Australia, Crawley, Western Australia Australia
| | - Sipin Zhu
- Department of Orthopaedics, The Second Affiliated Hospital and Yuying Children’s Hospital of Wenzhou Medical University, Wenzhou, Zhejiang China
| | - Georgios Mavropalias
- School of Medical and Health Sciences, Edith Cowan University, Joondalup, Western Australia Australia
| | | | - Jinmin Zhao
- Guangxi Key Laboratory of Regenerative Medicine, Guangxi Medical University, Nanning, Guangxi China
- Department of Orthopaedic Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi China
| | - Jiake Xu
- School of Biomedical Sciences, University of Western Australia, Crawley, Western Australia Australia
- Guangxi Key Laboratory of Regenerative Medicine, Guangxi Medical University, Nanning, Guangxi China
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Kitagawa T, Nakase J, Takata Y, Shimozaki K, Asai K, Tsuchiya H. Histopathological study of the infrapatellar fat pad in the rat model of patellar tendinopathy: A basic study. Knee 2019; 26:14-19. [PMID: 30150068 DOI: 10.1016/j.knee.2018.07.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 07/05/2018] [Accepted: 07/20/2018] [Indexed: 02/02/2023]
Abstract
BACKGROUND Patellar tendinopathy is difficult to successfully treat. This study aimed to characterize the pathological changes of the infrapatellar fat pad (IPFP) in patellar tendinopathy (PT), and to investigate the influence of PT on the development of fibrotic changes in the IPFP. METHODS Forty male Wistar rats were randomly divided into PT (n = 20) and control groups (n = 20). Bacterial collagenase I (patellar tendinopathy group) or saline (control) was injected, intratendinous, into the patellar tendon. Rats were sacrificed at week 12. The whole knee joint was sagittally sectioned and stained with hematoxylin-eosin and Masson's trichrome. The IPFP samples were graded according to cellularity, fibrosis, and vascularity. The whole IPFP and blue-stained area was measured. Mann-Whitney U tests were used to compare the between-group differences of each score and quantitative value. RESULTS Scores for cellularity were three (2-3) and 0 (0-1) in the PT and control groups, respectively (P < 0.01). Mean scores for fibrosis were two (1-3) and 0 (0-1) in the PT and control groups, respectively (P < 0.01). Mean scores for vascularity were two (2-3) and one (1-1) in the PT and control groups, respectively (P < 0.01). There was a significant difference in the total score between the PT and control groups (seven (5-8) and two (1-3), respectively) (P < 0.01). Average percentages of the fibrous area of the IPFP were 38.2 ± 26.5% and 11.2 ± 3.9% in the patellar tendinopathy and control groups, respectively (P < 0.01). CONCLUSION The IPFP in the patellar tendinopathy group showed greater cellularity, fibrosis, and vascularity than the control group.
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Affiliation(s)
- Takashi Kitagawa
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan; Department of Rehabilitation, Japanese Red Cross Kanazawa Hospital, Kanazawa, Japan
| | - Junsuke Nakase
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan.
| | - Yasushi Takata
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Kengo Shimozaki
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Kazuki Asai
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
| | - Hiroyuki Tsuchiya
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, Kanazawa, Japan
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Kitagawa T, Nakase J, Takata Y, Shimozaki K, Asai K, Tsuchiya H. Use of ultrasonography to evaluate the dynamics of the infrapatellar fat pad after anterior cruciate ligament reconstruction: a feasibility study. J Med Ultrason (2001) 2018; 46:147-151. [PMID: 30456484 DOI: 10.1007/s10396-018-0917-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2018] [Accepted: 10/18/2018] [Indexed: 01/13/2023]
Abstract
PURPOSE There has been no specific study on the quantitative morphological changes that occur in the infrapatellar fat pad (IPFP) after anterior cruciate ligament (ACL) reconstruction. We used ultrasonography to evaluate the dynamics of the IPFP in knees after ACL reconstruction using the contralateral knees as controls. METHODS We enrolled 31 patients 3 months after they underwent ACL reconstruction. The thickness of the superficial part of the IPFP was measured using longitudinally oriented ultrasound images of the anterior part of both knees at 90° and 10° flexion. We then used these data to calculate the ratio of the change in thickness. RESULTS At 90° knee flexion, the superficial part of the IPFP was significantly thinner in the reconstructed knees (9.3 ± 3.4 mm) than in the contralateral knees (11.8 ± 4.6 mm). The thickness change ratio was significantly smaller in the reconstructed knees (188.6 ± 64.7%) than in the contralateral knees (249.7 ± 73.8%). CONCLUSION When assessed 3 months after ACL reconstruction, the thickness of the superficial part of the IPFP at 90° knee flexion and the thickness change ratio of the IPFP were both significantly lower in the reconstructed knees than in the contralateral knees.
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Affiliation(s)
- Takashi Kitagawa
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, 920-8641, Japan.,Department of Rehabilitation, Japanese Red Cross Kanazawa Hospital, Kanazawa, Japan
| | - Junsuke Nakase
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, 920-8641, Japan.
| | - Yasushi Takata
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, 920-8641, Japan
| | - Kengo Shimozaki
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, 920-8641, Japan
| | - Kazuki Asai
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, 920-8641, Japan
| | - Hiroyuki Tsuchiya
- Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University, 13-1 Takara-machi, Kanazawa, 920-8641, Japan
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Stephen JM, Sopher R, Tullie S, Amis AA, Ball S, Williams A. The infrapatellar fat pad is a dynamic and mobile structure, which deforms during knee motion, and has proximal extensions which wrap around the patella. Knee Surg Sports Traumatol Arthrosc 2018; 26:3515-3524. [PMID: 29679117 DOI: 10.1007/s00167-018-4943-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 04/04/2018] [Indexed: 01/09/2023]
Abstract
PURPOSE The infrapatellar fat pad (IFP) is a common cause of knee pain and loss of knee flexion and extension. However, its anatomy and behavior are not consistently defined. METHODS Thirty-six unpaired fresh frozen knees (median age 34 years, range 21-68) were dissected, and IFP attachments and volume measured. The rectus femoris was elevated, suprapatellar pouch opened and videos recorded looking inferiorly along the femoral shaft at the IFP as the knee was flexed. The patellar retinacula were incised and the patella reflected distally. The attachment of the ligamentum mucosum (LMuc) to the intercondylar notch was released from the anterior cruciate ligament (ACL), both menisci and to the tibia via meniscotibial ligaments. IFP strands projecting along both sides of the patella were elevated and the IFP dissected from the inferior patellar pole. Magnetic resonance imaging (MRI) of one knee at ten flexion angles was performed and the IFP, patella, tibia and femur segmented. RESULTS In all specimens the IFP attached to the inferior patellar pole, femoral intercondylar notch (via the LMuc), proximal patellar tendon, intermeniscal ligament, both menisci and the anterior tibia via the meniscotibial ligaments. In 30 specimens the IFP attached to the anterior ACL fibers via the LMuc, and in 29 specimens it attached directly to the central anterior tibia. Proximal IFP extensions were identified alongside the patella in all specimens and visible on MRI [medially (100% of specimens), mean length 56.2 ± 8.9 mm, laterally (83%), mean length 23.9 ± 6.2 mm]. Mean IFP volume was 29.2 ± 6.1 ml. The LMuc, attached near the base of the middle IFP lobe, acting as a 'tether' drawing it superiorly during knee extension. The medial lobe consistently had a pedicle superomedially, positioned between the patella and medial trochlea. MRI scans demonstrated how the space between the anterior tibia and patellar tendon ('the anterior interval') narrowed during knee flexion, displacing the IFP superiorly and posteriorly as it conformed to the trochlear and intercondylar notch surfaces. CONCLUSION Proximal IFP extensions are a novel description. The IFP is a dynamic structure, displacing significantly during knee motion, which is, therefore, vulnerable to interference from trauma or repetitive overload. Given that this trauma is often surgical, it may be appropriate that surgeons learn to minimize injury to the fat pad at surgery.
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Affiliation(s)
- Joanna M Stephen
- Fortius Clinic, 17 Fitzhardinge St, London, W1H 6EQ, UK. .,Department of Mechanical Engineering, Imperial College London, London, UK.
| | - Ran Sopher
- Department of Mechanical Engineering, Imperial College London, London, UK
| | - Sebastian Tullie
- School of Clinical Medicine, University of Cambridge, Addenbrooke's Hospital, Hills Road, Cambridge, UK
| | - Andrew A Amis
- Department of Mechanical Engineering, Imperial College London, London, UK.,Musculoskeletal Surgery Group, Department of Surgery and Cancer, School of Medicine, Imperial College London, Charing Cross Hospital, London, UK
| | - Simon Ball
- Fortius Clinic, 17 Fitzhardinge St, London, W1H 6EQ, UK.,Department of Mechanical Engineering, Imperial College London, London, UK
| | - Andy Williams
- Fortius Clinic, 17 Fitzhardinge St, London, W1H 6EQ, UK. .,Department of Mechanical Engineering, Imperial College London, London, UK.
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15
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Abstract
The infrapatellar fat pad (IFP) of Hoffa's fat pad is the main adipose structure within the knee joint. It is located between the joint capsule and the synovial membrane, which lines its posterior aspect. The IFP is composed chiefly of adipocytes and receives an abundant supply of blood vessels and nerves. Immune cells can infiltrate the IFP, which can become a major source of numerous proinflammatory mediators (cytokines and adipokines). The physiological role for the IFP remains unclear but may involve shock absorption and the protection of adjacent tissues. Hoffa's disease is characterized by inflammation, hypertrophy, and fibrosis of the pad in response to repetitive trauma. Anterior knee pain is the most common symptom. In advanced forms, metaplasia of the IFP may result in the development of a sometimes sizable osteochondroma. The IFP may also contribute to the pathophysiology of knee osteoarthritis, in particular via procatabolic and proinflammatory effects on its synovial lining. Finally, in patients with knee osteoarthritis, inflammation of the IFP may be a source of pain.
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Affiliation(s)
- Florent Eymard
- Service de rhumatologie, Hôpital Henri Mondor, 51 avenue du Maréchal de Lattre de Tassigny, 94000 Créteil, France.
| | - Xavier Chevalier
- Service de rhumatologie, Hôpital Henri Mondor, 51 avenue du Maréchal de Lattre de Tassigny, 94000 Créteil, France
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Central defect type partial ACL injury model on goat knees: the effect of infrapatellar fat pad excision. J Orthop Surg Res 2015; 10:137. [PMID: 26338041 PMCID: PMC4558767 DOI: 10.1186/s13018-015-0281-x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 08/25/2015] [Indexed: 01/12/2023] Open
Abstract
Background The mid-substance central defect injury has been used to investigate the primary healing capacity of the anterior cruciate ligament (ACL) in a goat model. The sagittal plane stability on this model has not been confirmed, and possible effects of fat pad excision on healing have not been evaluated. We hypothesize that excising the fat pad tissue results in poorer ligament healing as assessed histologically and decreased tensile strength of the healing ligament. We further hypothesize that the creation of a central defect does not affect sagittal plane knee stability. Methods A mid-substance central defect was created with a 4-mm arthroscopic punch in the ACLs of right knees of all the subjects through a medial mini-arthrotomy. Goats were assigned to groups based on whether the fat pad was preserved (group 1, n = 5) or excised completely (group 2, n = 5). The left knees served as controls in each goat. Histopathology of the defect area along with measurement of type I collagen in one goat from each group were performed at 10th week postoperatively. The remaining knees were evaluated biomechanically at the 12th week, by measuring anterior tibial translation (ATT) of the knee joints at 90° of flexion and testing tensile properties (ultimate tensile load (UTL), ultimate elongation (UE), stiffness (S), failure mode (FM)) of the femur-ACL-tibia complex. Results and discussion Histopathology analysis revealed that the central defect area was fully filled macroscopically and microscopically. However, myxoid degeneration and fibrosis were observed in group 2 and increased collagen type I content was noted in group 2. There were no significant differences within and between groups in terms of ATT values (p = 0.715 and p = 0.149, respectively). There were no significance between or within groups in terms of ultimate tensile load and ultimate elongation; however, group 2 demonstrated greater stiffness than group 1 that was correlated with the fibrotic changes detected microscopically (p = 0.043). Conclusions The central defect type injury model was confirmed to be biomechanically stable in a goat model. Resection of the fat pad was noted to negatively affect defect healing and increase ligament stiffness in the central defect injury model.
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