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Øiestad BE, Juhl CB, Culvenor AG, Berg B, Thorlund JB. Knee extensor muscle weakness is a risk factor for the development of knee osteoarthritis: an updated systematic review and meta-analysis including 46 819 men and women. Br J Sports Med 2021; 56:349-355. [PMID: 34916210 DOI: 10.1136/bjsports-2021-104861] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/29/2021] [Indexed: 01/16/2023]
Abstract
OBJECTIVE To update a systematic review on the association between knee extensor muscle weakness and the risk of incident knee osteoarthritis in women and men. DESIGN Systematic review and meta-analysis. DATA SOURCES Systematic searches in PubMed, EMBASE, SPORTDiscus, CINAHL, AMED and CENTRAL in May 2021. ELIGIBLE CRITERIA FOR SELECTING STUDIES Longitudinal studies with at least 2 years follow-up including baseline measure of knee extensor muscle strength, and follow-up measure of symptomatic or radiographic knee osteoarthritis. Studies including participants with known knee osteoarthritis at baseline were excluded. Risk of bias assessment was conducted using six criteria for study validity and bias. Grading of Recommendations Assessments, Development and Evaluation assessed overall quality of evidence. Meta-analysis estimated the OR for the association between knee extensor muscle weakness and incident knee osteoarthritis. RESULTS We included 11 studies with 46 819 participants. Low quality evidence indicated that knee extensor muscle weakness increased the odds of symptomatic knee osteoarthritis in women (OR 1.85, 95% CI 1.29 to 2.64) and in adult men (OR 1.43, 95% CI 1.14 to 1.78), and for radiographic knee osteoarthritis in women: OR 1.43 (95% CI 1.19 to 1.71) and in men: OR 1.39 (95% CI 1.07 to 1.82). No associations were identified for knee injured populations except for radiographic osteoarthritis in men. DISCUSSION There is low quality evidence that knee extensor muscle weakness is associated with incident symptomatic and radiographic knee osteoarthritis in women and men. Optimising knee extensor muscle strength may help to prevent knee osteoarthritis. PROSPERO REGISTRATION NUMBER CRD42020214976.
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Affiliation(s)
- Britt Elin Øiestad
- Department of Physiotherapy, Faculty of Health Sciences, Oslo Metropolitan University, Oslo, Norway
| | - Carsten B Juhl
- Department of Physiotherapy and Occupational Theray, Copenhagen University Hospital, Herlev and Gentofte, Denmark.,Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark
| | - Adam G Culvenor
- La Trobe Sport and Exercise Medicine Research Centre, La Trobe University School of Allied Health Human Services and Sport, Bundoora, Victoria, Australia
| | - Bjørnar Berg
- Division of Orthopaedic Surgery, Oslo University Hospital, Oslo, Norway
| | - Jonas Bloch Thorlund
- Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark.,Research Unit for General Practice, Department of Public Health, University of Southern Denmark, Odense, Denmark
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The effect of extensor muscle strength on meniscus damage progression in subjects without radiologic knee osteoarthritis – Data from the Osteoarthritis Initiative. Am J Phys Med Rehabil 2021; 101:836-842. [DOI: 10.1097/phm.0000000000001922] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Andrews JS, Gold LS, Nevitt M, Heagerty PJ, Cawthon PM. Appendicular Lean Mass, Grip Strength, and the Development of Knee Osteoarthritis and Knee Pain Among Older Adults. ACR Open Rheumatol 2021; 3:566-572. [PMID: 34245226 PMCID: PMC8363849 DOI: 10.1002/acr2.11302] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 06/11/2021] [Indexed: 12/25/2022] Open
Abstract
Objective The association of sarcopenia with development of knee osteoarthritis (OA) or knee pain in older adults is uncertain. We examined the relationship of grip strength and appendicular lean mass (ALM) with the likelihood of developing knee OA and knee pain in older adults in the Health ABC (Health, Aging, and Body Composition) Study. Methods ALM and grip strength were assessed at baseline by dual‐energy x‐ray absorptiometry and handheld dynamometry, respectively. Incident clinically diagnosed, symptomatic knee OA, defined as new participant report of physician‐diagnosed knee OA and concurrent frequent knee pain, and incident frequent knee pain over 5 years of follow‐up were examined. Separate regression analyses, stratified by sex, modeled associations of baseline ALM and grip strength with the likelihood of incident clinically diagnosed, symptomatic knee OA and incident knee pain over follow‐up, adjusting for covariates. Results Among the 2779 subjects without OA at baseline, 95 men (6.9%) and 158 women (11.3%) developed clinically diagnosed, symptomatic knee OA, and, among the 2182 subjects without knee pain at baseline, 315 men (28.3%) and 385 women (36.1%) developed knee pain over follow‐up. Among men only, each SD decrement of ALM was associated with decreasing likelihood of incident knee OA (odds ratio [OR] per SD decrement: 0.68; 95% confidence interval [CI]: 0.47‐0.97), and each SD decrement of grip strength was associated with increasing likelihood of incident knee pain (OR per SD decrement: 1.20; 95% CI: 1.01‐1.42). Conclusion In older men, ALM and grip strength may be associated with the development of knee OA and knee pain, respectively.
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Affiliation(s)
| | | | | | | | - Peggy M Cawthon
- California Pacific Medical Center Research Institute and University of California, San Francisco
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Sandhar S, Smith TO, Toor K, Howe F, Sofat N. Risk factors for pain and functional impairment in people with knee and hip osteoarthritis: a systematic review and meta-analysis. BMJ Open 2020; 10:e038720. [PMID: 32771991 PMCID: PMC7418691 DOI: 10.1136/bmjopen-2020-038720] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
OBJECTIVE To identify risk factors for pain and functional deterioration in people with knee and hip osteoarthritis (OA) to form the basis of a future 'stratification tool' for OA development or progression. DESIGN Systematic review and meta-analysis. METHODS An electronic search of the literature databases, Medline, Embase, CINAHL, and Web of Science (1990-February 2020), was conducted. Studies that identified risk factors for pain and functional deterioration to knee and hip OA were included. Where data and study heterogeneity permitted, meta-analyses presenting mean difference (MD) and ORs with corresponding 95% CIs were undertaken. Where this was not possible, a narrative analysis was undertaken. The Downs & Black tool assessed methodological quality of selected studies before data extraction. Pooled analysis outcomes were assessed and reported using the Grading of Reccomendation, Assessment, Development and Evaluation (GRADE) approach. RESULTS 82 studies (41 810 participants) were included. On meta-analysis: there was moderate quality evidence that knee OA pain was associated with factors including: Kellgren and Lawrence≥2 (MD: 2.04, 95% CI 1.48 to 2.81; p<0.01), increasing age (MD: 1.46, 95% CI 0.26 to 2.66; p=0.02) and whole-organ MRI scoring method (WORMS) knee effusion score ≥1 (OR: 1.35, 95% CI 0.99 to 1.83; p=0.05). On narrative analysis: knee OA pain was associated with factors including WORMS meniscal damage ≥1 (OR: 1.83). Predictors of joint pain in hip OA were large acetabular bone marrow lesions (BML; OR: 5.23), chronic widespread pain (OR: 5.02) and large hip BMLs (OR: 4.43). CONCLUSIONS Our study identified risk factors for clinical pain in OA by imaging measures that can assist in predicting and stratifying people with knee/hip OA. A 'stratification tool' combining verified risk factors that we have identified would allow selective stratification based on pain and structural outcomes in OA. PROSPERO REGISTRATION NUMBER CRD42018117643.
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Affiliation(s)
- Sandeep Sandhar
- Institute for Infection and Immunity, University of London St George's, London, UK
| | - Toby O Smith
- Nuffield Department of Orthopaedics and Musculoskeletal Sciences, University of Oxford, Oxford, UK
| | - Kavanbir Toor
- Institute for Infection and Immunity, University of London St George's, London, UK
| | - Franklyn Howe
- Molecular and Clinical Sciences Research Institute, University of London St George's, London, UK
| | - Nidhi Sofat
- Institute for Infection and Immunity, University of London St George's, London, UK
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5
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Harkey MS, Price LL, Reid KF, Lo GH, Liu SH, Lapane KL, Dantas LO, McAlindon TE, Driban JB. Patient-specific reference values for objective physical function tests: data from the Osteoarthritis Initiative. Clin Rheumatol 2020; 39:1961-1970. [PMID: 32030634 PMCID: PMC7372536 DOI: 10.1007/s10067-020-04972-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 01/28/2020] [Accepted: 01/31/2020] [Indexed: 11/26/2022]
Abstract
INTRODUCTION/OBJECTIVE We aimed to establish sex-specific reference values of objective physical function tests among individuals with or at risk for knee osteoarthritis (KOA) across subsets of age, radiographic KOA severity, and body mass index (BMI). METHOD We included Osteoarthritis Initiative participants with data for objective physical function tests, sex, age, BMI, and radiographic KOA severity (Kellgren-Lawrence [KL] grade) at baseline. Objective physical function was quantified with 20-m walk speed, chair-stand speed, 400-m walk time, and knee extension and flexion strength. We created participant characteristic subsets for sex, age, KL grade, and BMI. Reference values were created as percentiles from minimum to maximum in 10% increments for each combination of participant characteristic subsets. Previously established clinically important differences for 20-m walk speed and knee extension strength were used to highlight clinically relevant differences. RESULTS Objective physical function reference values tables and an interactive reference value table were created across all combinations of sex, age, KL grade, and BMI among 3860 individuals with or at risk for KOA. Clinically relevant differences exist for 20-m walk speed and knee extension strength between males and females across age groups, KL grades, and BMI categories. CONCLUSIONS Establishing an individual's relative level of objective physical function by comparing their performance to individuals with similar sex, age, KL grade, or BMI may help improve interpretation of physical function performance. The interactive reference value table will provide clinicians and researchers a clinically accessible avenue to use these reference values.Key Points• Since greater age, radiographic knee osteoarthritis severity, and body mass index are all associated with worse objective physical function, reference values should consider the complex inter-play among these patient characteristics.• This study provides objective physical function reference values among subsets of individuals across the spectrum of sex, age groups, radiographic knee osteoarthritis severity, and body mass index categories.• These reference values offer a more patient-centered approach for interpreting an individual's relative level of objective physical function by comparing them to a more homogeneous group of individuals with similar participant characteristics.• We have provided a clinically accessible interactive table that will enable clinicians and researchers to input their patient's data to quickly and efficiently determine a patient's relative objective physical function compared to individual's with similar characteristics.
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Affiliation(s)
- Matthew S Harkey
- Division of Rheumatology, Allergy, & Immunology, Tufts Medical Center, 800 Washington Street, Box 406, Boston, MA, 02111, USA.
- Division of Epidemiology of Chronic Diseases and Vulnerable Populations, Department of Population and Quantitative Health Sciences, University of Massachusetts Medical School, Worcester, MA, USA.
| | - Lori Lyn Price
- The Institute for Clinical Research and Health Policy Studies, Tufts Medical Center, Boston, MA, USA
- Tufts Clinical and Translational Science Institute, Tufts University, Boston, MA, USA
| | - Kieran F Reid
- Nutrition, Exercise Physiology, and Sarcopenia Laboratory, Jean Mayer Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA
| | - Grace H Lo
- Medical Care Line and Research Care Line, Houston Health Services Research and Development Center of Excellence Michael E. DeBakey VAMC, Houston, TX, USA
- Section of Immunology, Allergy, and Rheumatology, Baylor College of Medicine, Houston, TX, USA
| | - Shao-Hsien Liu
- Division of Epidemiology of Chronic Diseases and Vulnerable Populations, Department of Population and Quantitative Health Sciences, University of Massachusetts Medical School, Worcester, MA, USA
| | - Kate L Lapane
- Division of Epidemiology of Chronic Diseases and Vulnerable Populations, Department of Population and Quantitative Health Sciences, University of Massachusetts Medical School, Worcester, MA, USA
| | - Lucas Ogura Dantas
- Division of Rheumatology, Allergy, & Immunology, Tufts Medical Center, 800 Washington Street, Box 406, Boston, MA, 02111, USA
- Physical Therapy Department, Neuromuscular Plasticity Laboratory, Federal University of São Carlos, São Paulo, Brazil
| | - Timothy E McAlindon
- Division of Rheumatology, Allergy, & Immunology, Tufts Medical Center, 800 Washington Street, Box 406, Boston, MA, 02111, USA
| | - Jeffrey B Driban
- Division of Rheumatology, Allergy, & Immunology, Tufts Medical Center, 800 Washington Street, Box 406, Boston, MA, 02111, USA
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Birchmeier T, Lisee C, Kane K, Brazier B, Triplett A, Kuenze C. Quadriceps Muscle Size Following ACL Injury and Reconstruction: A Systematic Review. J Orthop Res 2020; 38:598-608. [PMID: 31608490 DOI: 10.1002/jor.24489] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 09/20/2019] [Indexed: 02/04/2023]
Abstract
Image-based assessments of quadriceps muscle size facilitate examination of structural changes after anterior cruciate ligament (ACL) injury and reconstruction (ACLR). Understanding the effects of ACLR on muscle size measures may aid in clarifying the contribution of quadriceps atrophy toward quadriceps strength. The purpose of this study was to systematically review the literature examining the effects of ACLR on quadriceps muscle volume and cross-sectional area (CSA). An online database search was conducted using Web of Science, SportDISCUS, PubMed (Medline), CINHAL (EBSCO), and Cochrane Library limited to articles published after January 1, 1980. Means and standard deviations were extracted for the ACLR limb and the contralateral limb, and sample characteristics from relevant articles. Magnitude of between limb differences were assessed using pooled effect sizes (Hedge's g) and 95% confidence intervals. Eleven articles (five CSA, six muscle volume) were included in this systematic review. Included studies reported negative effective sizes, indicating that the ACLR limb was smaller in CSA or muscle volume compared with the contralateral limb; however, 36% of the included articles reported meaningful difference between the limbs. Quadriceps atrophy may occur following ACL injury and persist after rehabilitation, however, the magnitude of these reductions may not be clinically meaningful and may only partially explain the persistent quadriceps weakness that is ubiquitous among this patient population. © 2019 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 38:598-608, 2020.
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Affiliation(s)
- Thomas Birchmeier
- Department of Kinesiology, College of Education, Michigan State University, IM Sports Circle, Rm 1, 308 W. Circle Dr, East Lansing, Michigan, 48824
| | - Caroline Lisee
- Department of Kinesiology, College of Education, Michigan State University, IM Sports Circle, Rm 1, 308 W. Circle Dr, East Lansing, Michigan, 48824
| | - Kevin Kane
- Department of Osteopathic Surgical Specialties, College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan
| | - Brett Brazier
- Department of Orthopaedic Surgery, San Antonio Military Medical Center, Fort Sam Houston, Texas
| | - Ashley Triplett
- Department of Kinesiology, College of Education, Michigan State University, IM Sports Circle, Rm 1, 308 W. Circle Dr, East Lansing, Michigan, 48824
| | - Christopher Kuenze
- Department of Kinesiology, College of Education, Michigan State University, IM Sports Circle, Rm 1, 308 W. Circle Dr, East Lansing, Michigan, 48824.,Department of Orthopedics, College of Osteopathic Medicine, Michigan State University, East Lansing, Michigan
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Pazzinatto MF, de Oliveira Silva D, Azevedo FMD, Pappas E. Knee crepitus is not associated with the occurrence of total knee replacement in knee osteoarthritis - a longitudinal study with data from the Osteoarthritis Initiative. Braz J Phys Ther 2018; 23:329-336. [PMID: 30292656 DOI: 10.1016/j.bjpt.2018.09.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2018] [Revised: 08/13/2018] [Accepted: 09/21/2018] [Indexed: 02/06/2023] Open
Abstract
OBJECTIVE(S) To investigate whether the presence of knee crepitus is associated with the occurrence of total knee replacement (TKR), quality of life and deficits in physical function at long-term. METHODS Setting - This observational study uses longitudinal data (up to 4-year follow-up) from the Osteoarthritis Initiative (OAI). Participants - 4566 participants. Main Outcome Measure(s) - Logistic regression models were used to test if baseline knee crepitus is associated with the occurrence of TKR. Linear mixed models with adjustment for confounding variables (age, gender, BMI and Kellgren-Lawrence grade) were used to test the association between baseline knee crepitus and longitudinal changes in the pain, self-reported physical function, quality of life and performance-based function. RESULTS The presence of knee crepitus at baseline does not predict the occurrence of TKR at 36 months (p=0.58 and 0.67 for right and left knees, respectively). The crepitus group presented a slightly knee extension strength decline from baseline to 48 months (p=0.03 for the right and 0.01 for the left knee; between group difference=2% for both right [95%CI=-0.12; -0.01] and left knees [95%CI=-0.13; -0.02]). CONCLUSION The presence of knee crepitus is not associated with the occurrence of TKR in the following three years. Knee crepitus is associated with slightly declines in knee extension strength, but this does not seem to affect physical function and quality of life at long-term.
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Affiliation(s)
- Marcella Ferraz Pazzinatto
- Physical Therapy Department, School of Science and Technology, Universidade Estadual Paulista (UNESP), Presidente Prudente, SP, Brazil; La Trobe Sports and Exercise Medicine Research Centre (LASEM), School of Allied Health, La Trobe University, Bundoora, Australia
| | - Danilo de Oliveira Silva
- Physical Therapy Department, School of Science and Technology, Universidade Estadual Paulista (UNESP), Presidente Prudente, SP, Brazil; La Trobe Sports and Exercise Medicine Research Centre (LASEM), School of Allied Health, La Trobe University, Bundoora, Australia
| | - Fábio Mícolis de Azevedo
- Physical Therapy Department, School of Science and Technology, Universidade Estadual Paulista (UNESP), Presidente Prudente, SP, Brazil.
| | - Evangelos Pappas
- Discipline of Physiotherapy, Faculty of Health Sciences, University of Sydney, Sydney, Australia
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PAMUKOFF DEREKN, MONTGOMERY MELISSAM, MOFFIT TYLERJ, VAKULA MICHAELN. Quadriceps Function and Knee Joint Ultrasonography after ACL Reconstruction. Med Sci Sports Exerc 2018; 50:211-217. [DOI: 10.1249/mss.0000000000001437] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Kemnitz J, Wirth W, Eckstein F, Ruhdorfer A, Culvenor AG. Longitudinal change in thigh muscle strength prior to and concurrent with symptomatic and radiographic knee osteoarthritis progression: data from the Osteoarthritis Initiative. Osteoarthritis Cartilage 2017; 25:1633-1640. [PMID: 28698106 DOI: 10.1016/j.joca.2017.07.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 06/04/2017] [Accepted: 07/03/2017] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To investigate whether symptomatic and/or radiographic knee osteoarthritis (KOA) progression is associated with prior and/or concurrent change in thigh muscle strength in men or women. DESIGN Osteoarthritis Initiative (OAI) participants with isometric muscle strength measurements at baseline, 2- and 4-year follow-up (n = 1785: 1016 women) were grouped into 1) those with vs without symptomatic progression (i.e., increase ≥9 in WOMAC-pain [scale: 0-100]); and 2) those with vs without radiographic progression (i.e., decrease in minimum joint space width (JSW) ≥0.7 mm) between year-two and year-four follow-up. Sex-specific changes in thigh muscle strength concurrent (between year-two and year-four follow-up) and prior to (between baseline and year-two follow-up) symptomatic and radiographic progression were compared between groups (progression vs no progression) using analysis of covariance, with adjustment for age and body mass index. RESULTS In women, but not in men, loss in knee extensor and flexor strength was greater concurrent with symptomatic progression (extensors: -3.7%, 95% confidence interval [CI] -6.4, -0.9; flexors: -7.2% 95% CI -10.7, -3.7) than in women without symptomatic progression (extensors: -0.3%, 95% CI -1.9, 1.3, P = 0.030; flexors: -2.6%, 95% CI -4.7, -0.6, P = 0.018). No association was found between extensor or flexor strength loss concurrent to radiographic progression, in either men or women, nor any statistically significant association between prior change in muscle strength with symptomatic or radiographic progression. CONCLUSION These findings suggest that there is concurrent but not prior longitudinal association between loss in muscle strength and symptomatic KOA progression that is specific to women.
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Affiliation(s)
- J Kemnitz
- Paracelsus Medical University, Institute of Anatomy Salzburg & Nuremberg, Salzburg, Austria.
| | - W Wirth
- Paracelsus Medical University, Institute of Anatomy Salzburg & Nuremberg, Salzburg, Austria; Chondrometrics GmbH, Ainring, Germany.
| | - F Eckstein
- Paracelsus Medical University, Institute of Anatomy Salzburg & Nuremberg, Salzburg, Austria; Chondrometrics GmbH, Ainring, Germany.
| | - A Ruhdorfer
- Paracelsus Medical University, Institute of Anatomy Salzburg & Nuremberg, Salzburg, Austria.
| | - A G Culvenor
- Paracelsus Medical University, Institute of Anatomy Salzburg & Nuremberg, Salzburg, Austria; La Trobe Sports and Exercise Medicine Research Centre, La Trobe University, School of Allied Health, Bundoora, Australia.
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10
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Culvenor AG, Ruhdorfer A, Juhl C, Eckstein F, Øiestad BE. Knee Extensor Strength and Risk of Structural, Symptomatic, and Functional Decline in Knee Osteoarthritis: A Systematic Review and Meta-Analysis. Arthritis Care Res (Hoboken) 2017; 69:649-658. [PMID: 27563843 DOI: 10.1002/acr.23005] [Citation(s) in RCA: 86] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2016] [Revised: 07/05/2016] [Accepted: 08/09/2016] [Indexed: 12/16/2022]
Abstract
OBJECTIVE To perform a systematic review and meta-analysis on the association between knee extensor strength and the risk of structural, symptomatic, or functional deterioration in individuals with or at risk of knee osteoarthritis (KOA). METHODS We systematically identified and methodologically appraised all longitudinal studies (≥1-year followup) reporting an association between knee extensor strength and structural (tibiofemoral, patellofemoral), symptomatic (self-reported, knee replacement), or functional (subjective, objective) decline in individuals with or at risk of radiographic or symptomatic KOA. Results were pooled for each of the above associations using meta-analysis, or if necessary, summarized according to a best-evidence synthesis. RESULTS Fifteen studies were included, evaluating >8,000 participants (51% female), with a followup time between 1.5 and 8 years. Meta-analysis revealed that lower knee extensor strength was associated with an increased risk of symptomatic (Western Ontario and McMaster Universities Osteoarthritis Index [WOMAC] pain: odds ratio [OR] 1.35, 95% confidence interval [95% CI] 1.10-1.67) and functional decline (WOMAC function: OR 1.38, 95% CI 1.00-1.89, and chair-stand task: OR 1.03, 95% CI 1.03-1.04), but not increased risk of radiographic tibiofemoral joint space narrowing (JSN) (OR 1.15, 95% CI 0.84-1.56). No trend in risk was observed for KOA status (present versus absent). Best-evidence synthesis showed inconclusive evidence for lower knee extensor strength being associated with increased risk of patellofemoral deterioration. CONCLUSION Meta-analysis showed that lower knee extensor strength is associated with an increased risk of symptomatic and functional deterioration, but not tibiofemoral JSN. The risk of patellofemoral deterioration in the presence of knee extensor strength deficits is inconclusive.
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Affiliation(s)
- Adam G Culvenor
- Institute of Anatomy, Paracelsus Medical University Salzburg & Nuremberg, Salzburg, Austria, and School of Allied Health, La Trobe University, Bundoora, Melbourne, Victoria, Australia
| | - Anja Ruhdorfer
- Institute of Anatomy, Paracelsus Medical University Salzburg and Nuremberg, Salzburg, Austria
| | - Carsten Juhl
- University of Southern Denmark, Odense, Denmark, and University Hospital of Copenhagen, Herlev and Gentofte, Denmark
| | - Felix Eckstein
- Institute of Anatomy, Paracelsus Medical University Salzburg and Nuremberg, Salzburg, Austria
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Culvenor AG, Wirth W, Ruhdorfer A, Eckstein F. Thigh Muscle Strength Predicts Knee Replacement Risk Independent of Radiographic Disease and Pain in Women: Data From the Osteoarthritis Initiative. Arthritis Rheumatol 2017; 68:1145-55. [PMID: 26663882 DOI: 10.1002/art.39540] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Accepted: 12/01/2015] [Indexed: 11/12/2022]
Abstract
OBJECTIVE To determine whether thigh muscle strength predicts the risk of undergoing knee replacement surgery, independent of radiographic severity of osteoarthritis and pain. METHODS Participants in the Osteoarthritis Initiative study who had received a knee replacement between the 12-month and 60-month follow-up visits (cases) were each matched with 1 control subject (who did not receive a knee replacement over 60 months) for age, sex, height, body mass index, baseline radiographic stage, and location of joint space narrowing. Isometric knee extensor and flexor strength was recorded biennially. The strength examination prior to knee replacement (≤2 years) was termed time 0, that 2 years prior to time 0 was termed time -2, and that 4 years prior to time 0 was termed time -4. Muscle strength in patients and controls was compared using paired t-tests and conditional logistic regression analysis adjusted for pain. RESULTS One hundred thirty-six participants (60% women, mean ± SD age 65 ± 9 years, body mass index 29 ± 4 kg/m(2) ) received a knee replacement during follow-up, had strength data for at least time 0, and had a matched control. Knee extensor strength at time 0 (primary outcome measure) was significantly lower in female patients compared with controls (P < 0.001, pain-adjusted odds ratio [ORadj ] 1.72, 95% confidence interval 1.16-2.56), but no significant difference was observed in men. Results were similar for knee flexor strength at time 0 and for longitudinal change in extensor and flexor strength between time -2 and time 0. Thigh muscle strength at time -2 or time -4, or change between time -4 and time -2, did not predict the risk of undergoing knee replacement surgery in men or women. CONCLUSION Thigh muscle strength predicted the risk of undergoing knee replacement surgery in women, but not in men. The results of this study may identify a window during which the risk of undergoing knee replacement surgery in women can be modified.
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Affiliation(s)
- Adam G Culvenor
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria, and La Trobe University, Bundoora Campus, Melbourne, Victoria, Australia
| | - Wolfgang Wirth
- Paracelsus Medical University, Salzburg, Austria, and Chondrometrics GmbH, Ainring, Germany
| | | | - Felix Eckstein
- Paracelsus Medical University, Salzburg, Austria, and Chondrometrics GmbH, Ainring, Germany
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12
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Ruhdorfer A, Wirth W, Eckstein F. Longitudinal Change in Thigh Muscle Strength Prior to and Concurrent With Minimum Clinically Important Worsening or Improvement in Knee Function: Data From the Osteoarthritis Initiative. Arthritis Rheumatol 2016; 68:826-36. [PMID: 26556499 DOI: 10.1002/art.39484] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2015] [Accepted: 10/27/2015] [Indexed: 12/14/2022]
Abstract
OBJECTIVE To investigate whether a clinically relevant change in knee function in patients with or at risk for osteoarthritis (OA) of the knee is associated with concurrent or prior change in thigh muscle strength. METHODS Participants in the Osteoarthritis Initiative (n = 2,675 [1,485 women and 1,190 men]) with available measurements of isometric muscle strength at baseline, 2-year follow-up, and 4-year follow-up were grouped into those with greater than minimum clinically important worsening (score of ≥6 [of a possible 68] on the Western Ontario and McMaster Universities Osteoarthritis Index function subscale) between 2-year follow-up and 4-year follow-up, those with greater than minimum clinically important improvement, and those without relevant change. Changes in isometric muscle strength concurrent with function change (between 2-year follow-up and 4-year follow-up) and preceding function change (between baseline and 2-year follow-up), with 95% confidence intervals (95% CIs), were determined, and differences between groups were assessed by analysis of covariance. RESULTS Concurrent loss in extensor muscle strength in participants with worsening knee function during the 2-year follow-up-4-year follow-up period differed significantly from that in participants without change in knee function (-4.6% [95% CI -6.8, -2.4] and -2.2% [95% CI -3.0, -1.4], respectively; P = 0.03), as did the concurrent increase in strength among those with functional improvement (2.2% [95% CI -0.3, 4.7]; P < 0.0001). This increase in strength among subjects with improved function remained significantly different from the change in subjects with no change in function after adjustment for covariates, but was preceded by a greater loss in strength (-7.7% [95% CI -10.3, -5.0], P = 0.02) during the baseline-year 2 period compared to those without change in function during the year 2-year 4 period (-4.3% [95% CI -5.2, -3.4]). The decrease in strength during the baseline-year 2 period in those with worsening knee function during the year 2-year 4 period (-4.5% [95% CI -6.9, -2.2]) did not differ significantly from that in patients without a change in function (P = 0.87). No differences in changes in flexor muscle strength were observed between groups. CONCLUSION These findings suggest that there is a positive concurrent longitudinal association between change in extensor muscle strength and worsening/improvement in knee function in patients with knee OA. However, a corresponding change in thigh muscle strength preceding the change in function was not observed.
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Affiliation(s)
| | - Wolfgang Wirth
- Paracelsus Medical University, Salzburg, Austria, and Chondrometrics GmbH, Ainring, Germany
| | - Felix Eckstein
- Paracelsus Medical University, Salzburg, Austria, and Chondrometrics GmbH, Ainring, Germany
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Knee muscle strength correlates with joint cartilage T2 relaxation time in young participants with risk factors for osteoarthritis. Clin Rheumatol 2016; 35:2087-2092. [DOI: 10.1007/s10067-016-3333-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Revised: 05/20/2016] [Accepted: 06/16/2016] [Indexed: 12/30/2022]
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Ruhdorfer A, Wirth W, Dannhauer T, Eckstein F. Longitudinal (4 year) change of thigh muscle and adipose tissue distribution in chronically painful vs painless knees--data from the Osteoarthritis Initiative. Osteoarthritis Cartilage 2015; 23:1348-56. [PMID: 25887367 PMCID: PMC4516618 DOI: 10.1016/j.joca.2015.04.004] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2014] [Revised: 02/25/2015] [Accepted: 04/02/2015] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To evaluate 4-year longitudinal change in thigh muscle and adipose tissue content in chronically painful vs painless knees. METHODS Knees from Osteoarthritis Initiative (OAI) participants with non-acceptable symptom status (numerical rating scale (NRS) ≥4) and frequent pain (≥6 months at baseline, year 2 and year 4 follow-up) were studied. These were matched with painless controls (bilateral NRS pain intensity ≤1 and ≤infrequent pain at all 3 timepoints). 4-year longitudinal changes in thigh muscle anatomical cross-sectional areas (CSAs), isometric muscle strength, and in subcutaneous (SCF) and intermuscular fat (IMF) CSAs were obtained from magnetic resonance images (MRI) and were compared between groups (paired t-tests). RESULTS 43 participants fulfilled the inclusion criteria of chronic pain, had complete thigh muscle MRI acquisitions and strength measurements, and a matched control. Quadriceps CSAs, but not extensor strength, showed a significant longitudinal decrease in chronically painful knees (-3.9%; 95% confidence interval [95 CI] -6.3%, -1.5%) and in painless controls (-2.4%; 95% CI -4.1%, -0.7%); the difference in change was not statistically significant (P = 0.33). There was a significant 4-year gain in SCF in painful knees (8.1%; 95% CI 3.1%, 13%) but not in controls (0.0%; 95% CI -4.4%, +4.4%) with the difference in change being significant (P = 0.03). The gain in IMF (∼5.2%) was similar between painful and painless knees. CONCLUSION This is the first paper to show a significant impact of (chronic) knee pain on longitudinal change in local subcutaneous adipose tissue. The effect of pain on subcutaneous fat appeared stronger than that on intermuscular adipose tissue and on muscle status.
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Affiliation(s)
- A Ruhdorfer
- Institute of Anatomy, Paracelsus Medical University Salzburg and Nuremberg, Salzburg, Austria.
| | - W Wirth
- Institute of Anatomy, Paracelsus Medical University Salzburg and Nuremberg, Salzburg, Austria
| | - T Dannhauer
- Institute of Anatomy, Paracelsus Medical University Salzburg and Nuremberg, Salzburg, Austria
| | - F Eckstein
- Institute of Anatomy, Paracelsus Medical University Salzburg and Nuremberg, Salzburg, Austria
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Ruhdorfer A, Wirth W, Eckstein F. Relationship between isometric thigh muscle strength and minimum clinically important differences in knee function in osteoarthritis: data from the osteoarthritis initiative. Arthritis Care Res (Hoboken) 2015; 67:509-18. [PMID: 25303012 DOI: 10.1002/acr.22488] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2014] [Accepted: 09/23/2014] [Indexed: 12/11/2022]
Abstract
OBJECTIVE To determine the relationship between thigh muscle strength and clinically relevant differences in self-assessed lower leg function. METHODS Isometric knee extensor and flexor strength of 4,553 Osteoarthritis Initiative participants (2,651 women and 1,902 men) was related to the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) physical function scores by linear regression. Further, groups of male and female participant strata with minimum clinically important differences (MCIDs) in WOMAC function scores (6 of 68 units) were compared across the full range of observed values and to participants without functional deficits (WOMAC score 0). The effect of WOMAC knee pain and body mass index on the above relationships was explored using stepwise regression. RESULTS Per regression equations, a 3.7% reduction in extensor strength and a 4.0% reduction in flexor strength were associated with an MCID in WOMAC function in women, and, respectively, a 3.6% and 4.8% reduction in men. For strength divided by body weight, reductions were 5.2% and 6.7%, respectively, in women and 5.8% and 6.7%, respectively, in men. Comparing MCID strata across the full observed range of WOMAC function confirmed the above estimates and did not suggest nonlinear relationships across the spectrum of observed values. WOMAC pain correlated strongly with WOMAC function, but extensor (and flexor) muscle strength contributed significant independent information. CONCLUSION Reductions of approximately 4% in isometric muscle strength and of 6% in strength per body weight were related to a clinically relevant difference in WOMAC functional disability. Longitudinal studies will need to confirm these relationships within persons. Muscle extensor (and flexor) strength (per body weight) provided significant independent information in addition to pain in explaining variability in lower leg function.
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Affiliation(s)
- Anja Ruhdorfer
- Institute of Anatomy, Paracelsus Medical University, Salzburg and Nuremberg, Salzburg, Austria
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Øiestad BE, Juhl CB, Eitzen I, Thorlund JB. Knee extensor muscle weakness is a risk factor for development of knee osteoarthritis. A systematic review and meta-analysis. Osteoarthritis Cartilage 2015; 23:171-7. [PMID: 25450853 DOI: 10.1016/j.joca.2014.10.008] [Citation(s) in RCA: 260] [Impact Index Per Article: 28.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/18/2014] [Revised: 10/12/2014] [Accepted: 10/19/2014] [Indexed: 02/02/2023]
Abstract
The objective of this study was to perform a systematic review and meta-analysis on the association between knee extensor muscle weakness and the risk of developing knee osteoarthritis. A systematic review and meta-analysis was conducted with literature searches in Medline, SPORTDiscus, EMBASE, CINAHL, and AMED. Eligible studies had to include participants with no radiographic or symptomatic knee osteoarthritis at baseline; have a follow-up time of a minimum of 2 years, and include a measure of knee extensor muscle strength. Hierarchies for extracting data on knee osteoarthritis and knee extensor muscle strength were defined prior to data extraction. Meta-analysis was applied on the basis of the odds ratios (ORs) of developing symptomatic knee osteoarthritis or radiographic knee osteoarthritis in subjects with knee extensor muscle weakness. ORs for knee osteoarthritis and 95% confidence intervals (CI) were estimated and combined using a random effects model. Twelve studies were eligible for inclusion in the meta-analysis after the initial searches. Five cohort studies with a follow-up time between 2.5 and 14 years, and a total number of 5707 participants (3553 males and 2154 females), were finally included. The meta-analysis showed an overall increased risk of developing symptomatic knee osteoarthritis in participants with knee extensor muscle weakness (OR 1.65 95% CI 1.23, 2.21; I(2) = 50.5%). This systematic review and meta-analysis showed that knee extensor muscle weakness was associated with an increased risk of developing knee osteoarthritis in both men and women.
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Affiliation(s)
- B E Øiestad
- Norwegian Research Center for Active Rehabilitation, Department of Orthopedics, Oslo University Hospital, Oslo, Norway.
| | - C B Juhl
- Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark; Department of Orthopedics, University Hospital of Copenhagen, Gentofte, Denmark.
| | - I Eitzen
- Department of Orthopedics, Oslo University Hospital, Oslo, Norway.
| | - J B Thorlund
- Research Unit for Musculoskeletal Function and Physiotherapy, Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark.
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Ruhdorfer AS, Dannhauer T, Wirth W, Cotofana S, Roemer F, Nevitt M, Eckstein F. Thigh muscle cross-sectional areas and strength in knees with early vs knees without radiographic knee osteoarthritis: a between-knee, within-person comparison. Osteoarthritis Cartilage 2014; 22:1634-8. [PMID: 25278072 PMCID: PMC4185150 DOI: 10.1016/j.joca.2014.06.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Revised: 06/02/2014] [Accepted: 06/03/2014] [Indexed: 02/02/2023]
Abstract
OBJECTIVE To compare cross-sectional and longitudinal side-differences in thigh muscle anatomical cross-sectional areas (ACSAs), muscle strength, and specific strength (strength/ACSA), between knees with early radiographic change vs knees without radiographic knee osteoarthritis (RKOA), in the same person. DESIGN 55 (of 4796) Osteoarthritis Initiative (OAI) participants fulfilled the inclusion criteria of early RKOA in one limb (definite tibiofemoral osteophytes; no radiographic joint space narrowing [JSN]) vs no RKOA (no osteophyte; no JSN) in the contralateral limb. ACSAs of the thigh muscles and quadriceps heads were determined using axial MRIs at 33%/30% femoral length (distal to proximal). Isometric extensor and flexor muscle strength were measured (Good Strength Chair). Baseline quadriceps ACSA and extensor (specific) strength represented the primary analytic focus, and 2-year changes of quadriceps ACSAs the secondary focus. RESULTS No statistically significant side-differences in quadriceps (or other thigh muscle) ACSAs, muscle strength, or specific strength were observed between early RKOA vs contralateral limbs without RKOA (P ≥ 0.44), neither in men nor in women. The 2-year reduction in quadriceps ACSA in limbs with early RKOA was -0.9 ± 6% (mean ± standard deviation) vs -0.5 ± 6% in limbs without RKOA (statistical difference P = 0.85). CONCLUSION Our results do not provide evidence that early unilateral radiographic changes, i.e., presence of osteophytes, are associated with cross-sectional or longitudinal differences in quadriceps muscle status compared with contralateral knees without RKOA. At the stage of early unilateral RKOA there thus appears to be no clinical need for countervailing a potential dys-balance in quadriceps ACSAs and strength between both knees.
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Affiliation(s)
- A S Ruhdorfer
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria.
| | - T Dannhauer
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria.
| | - W Wirth
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria.
| | - S Cotofana
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria.
| | - F Roemer
- Department of Radiology, Boston University School of Medicine, Boston, MA, USA.
| | - M Nevitt
- Department of Epidemiology & Biostatistics, University of California, San Francisco, CA, USA.
| | - F Eckstein
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria.
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Sattler M, Dannhauer T, Ring-Dimitriou S, Sänger AM, Wirth W, Hudelmaier M, Eckstein F. Relative distribution of quadriceps head anatomical cross-sectional areas and volumes--sensitivity to pain and to training intervention. Ann Anat 2014; 196:464-70. [PMID: 25153247 DOI: 10.1016/j.aanat.2014.07.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 06/02/2014] [Accepted: 07/07/2014] [Indexed: 10/25/2022]
Abstract
INTRODUCTION Quadriceps heads are important in biomechanical stabilization and in the pathogenesis osteoarthritis of the knee. This is the first study to explore the relative distribution of quadriceps head anatomical cross-sectional areas (ACSA) and volumes, and their response to pain and to training intervention. METHODS The relative proportions of quadriceps heads were determined in 48 Osteoarthritis Initiative participants with unilateral pain (65% women; age 45-78 years). Quadriceps head volumes were also measured in 35 untrained women (45-55 years) before and after 12-week training intervention. Cross-sectional areas of the vastus medialis (VM), inter-medius (VIM), and lateralis (VL), and of the rectus femoris (RF) were determined from axial T1-weighted MR images. RESULTS The proportion of the VM on the total quadriceps ACSA increased from proximal to distal. The difference in quadriceps ACSA of painful (vs. pain-free) limbs was -5.4% for the VM (p<0.001), -6.8% for the VL (p<0.01), -2.8% for the VIM (p=0.06), and +3.4% for the RF (p=0.67) but the VM/VL ratio was not significantly altered. The muscle volume increase during training intervention was +4.2% (p<0.05) for VM, +1.3% for VL, +2.0% for VIM (p<0.05) and +1.6% for RF. CONCLUSION The proportion of quadriceps head relative to total muscle ACSA and volume depends on the anatomical level studied. The results suggest that there may be a differential response of the quadriceps heads to pain-induced atrophy and to training-related hypertrophy. Studies in larger samples are needed to ascertain whether the observed differences in response to pain and training are statistically and clinically significant.
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Affiliation(s)
- M Sattler
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria
| | - T Dannhauer
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria; Chondrometrics GmbH, Ainring, Germany.
| | - S Ring-Dimitriou
- Department of Sport Science and Kinesiology, University of Salzburg, Salzburg, Austria
| | - A M Sänger
- Department of Cell Biology, University of Salzburg, Salzburg, Austria
| | - W Wirth
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria; Chondrometrics GmbH, Ainring, Germany
| | - M Hudelmaier
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria; Chondrometrics GmbH, Ainring, Germany
| | - F Eckstein
- Institute of Anatomy, Paracelsus Medical University, Salzburg, Austria; Chondrometrics GmbH, Ainring, Germany
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Longitudinal sensitivity to change of MRI-based muscle cross-sectional area versus isometric strength analysis in osteoarthritic knees with and without structural progression: pilot data from the Osteoarthritis Initiative. MAGNETIC RESONANCE MATERIALS IN PHYSICS BIOLOGY AND MEDICINE 2013; 27:339-47. [PMID: 24264140 DOI: 10.1007/s10334-013-0418-z] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 10/16/2013] [Accepted: 11/04/2013] [Indexed: 01/21/2023]
Abstract
OBJECT Biomechanical measurement of muscle strength represents established technology in evaluating limb function. Yet, analysis of longitudinal change suffers from relatively large between-measurement variability. Here, we determine the sensitivity to change of magnetic resonance imaging (MRI)-based measurement of thigh muscle anatomical cross sectional areas (ACSAs) versus isometric strength in limbs with and without structural progressive knee osteoarthritis (KOA), with focus on the quadriceps. MATERIALS AND METHODS Of 625 "Osteoarthritis Initiative" participants with radiographic KOA, 20 had MRI cartilage and radiographic joint space width loss in the right knee isometric muscle strength measurement and axial T1-weighted spin-echo acquisitions of the thigh. Muscle ACSAs were determined from manual segmentation at 33% femoral length (distal to proximal). RESULTS In progressor knees, the reduction in quadriceps ACSA between baseline and 2-year follow-up was -2.8 ± 7.9 % (standardized response mean [SRM] = -0.35), and it was -1.8 ± 6.8% (SRM = -0.26) in matched, non-progressive KOA controls. The decline in extensor strength was more variable than that in ACSAs, both in progressors (-3.9 ± 20%; SRM = -0.20) and in non-progressive controls (-4.5 ± 28%; SRM = -0.16). CONCLUSION MRI-based analysis of quadriceps muscles ACSAs appears to be more sensitive to longitudinal change than isometric extensor strength and is suggestive of greater loss in limbs with structurally progressive KOA than in non-progressive controls.
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