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Objective: This study aimed to systematically synthesize literature on prognostic factors of changes in either direction (ie, worsening or improvement) in pain, physical functioning, and participation in patients with knee and/or hip osteoarthritis (OA)., Methods: Studies included in two preceding reviews underwent full-text screening for inclusion in the current review. Additionally, an extensive literature search was conducted in five databases. Title/abstract screening was performed using an active learning program. Inclusion criteria comprised patients diagnosed with knee and/or hip OA, with the dependent variable assessing pain, physical functioning, or participation. Potential associated prognostic factors were measured as independent variables. The methodologic quality of studies was assessed with the Hayden criteria., Results: A total of 31 studies were included in this systematic review. In patients with knee OA, pain worsening was associated with lower physical functioning (strong evidence) and with higher body mass index, ethnicity, and a higher comorbidity count (moderate evidence). Also, in patients with knee OA, pain improvement was associated with less pain at baseline (moderate evidence). In patients with knee and/or hip OA, worsening of physical functioning exhibited associations with higher body mass index, more pain, more hip pain, a higher comorbidity count, higher avoidance of activities (strong evidence), and ethnicity (moderate evidence). In patients with knee OA, improvement in physical functioning showed an association with higher vitality (moderate evidence). Regarding the remaining prognostic factors, there is weak, inconclusive, or inconsistent evidence for an association with the outcomes. In patients with hip OA, only weak evidence was found for three factors predicting a change in physical functioning., Conclusion: This review encompasses prognostic factors associated with changes in either direction (ie, worsening or improvement) in pain, physical functioning, and participation. The results are consistent with other reviews. Future research should place a stronger emphasis on patients with hip OA and participation as an outcome., (© 2024 The Author(s). Arthritis Care & Research published by Wiley Periodicals LLC on behalf of American College of Rheumatology.)

Objective: To evaluate associations between severity of knee osteoarthritis (OA) on magnetic resonance imaging (MRI) and treatment outcomes in knee OA patients treated with exercise therapy in an exploratory study., Methods: Ninety-five participants with knee OA in a 12-week exercise program had obtained 3.0T MRI scans of the knee joint prior to treatment. MRI data were systematically assessed for OA severity of multiple features (cartilage integrity, bone marrow lesions, osteophyte formation, effusion/synovitis, and meniscal abnormalities) according to the Boston Leeds Osteoarthritis Knee Score method. Regression analyses were performed to analyze associations between OA severity on MRI (for the tibiofemoral and patellofemoral [PF] compartments) and outcome of exercise therapy, i.e., changes in activity limitations (Western Ontario and McMaster Universities Osteoarthritis Index physical function; primary outcome), pain and upper leg muscle strength, and treatment response (Outcome Measures in Rheumatology/Osteoarthritis Research Society International criteria)., Results: Improvements of 24%, 34%, and 21% on average in activity limitations, pain, and muscle strength, respectively, after 12-week exercise therapy were found (P < 0.001). Severity of abnormalities in PF cartilage integrity was significantly associated with fewer improvements in both activity limitations (P = 0.01) and muscle strength (P = 0.04). Severity of PF osteophyte formation was significantly associated with fewer improvements in muscle strength (P < 0.01). All other features on MRI were not associated with treatment outcome., Conclusion: Effectiveness of exercise therapy seems to be independent of OA severity on MRI, except for abnormalities in cartilage integrity and osteophyte formation, both in the PF compartment. Our study suggests that all grades of OA severity on MRI can benefit from professionally supervised exercise therapy, although the effects might be reduced in patients with advanced PF OA., (Copyright © 2014 by the American College of Rheumatology.)

Objective: To determine whether muscle strength, proprioceptive accuracy, and laxity are associated with self-reported knee instability in a large cohort of knee osteoarthritis (OA) patients, and to investigate whether muscle strength may compensate for impairment in proprioceptive accuracy or laxity, in order to maintain knee stability., Methods: Data from 283 knee OA patients from the Amsterdam Osteoarthritis cohort were used. Univariable and multivariable logistic regression analyses were performed to assess the association between muscle strength, proprioceptive accuracy (motion sense), frontal plane varus-valgus laxity, and self-reported knee instability. Additionally, effect modification between muscle strength and proprioceptive accuracy and between muscle strength and laxity was determined., Results: Self-reported knee instability was present in 67% of the knee OA patients and mainly occurred during walking. Lower muscle strength was significantly associated with the presence of self-reported knee instability, even after adjusting for relevant confounding. Impaired proprioceptive accuracy and high laxity were not associated with self-reported knee instability. No effect modification between muscle strength and proprioceptive accuracy or laxity was found., Conclusion: Lower muscle strength is strongly associated with self-reported knee instability in knee OA patients, while impairments in proprioceptive accuracy and laxity are not. A compensatory role of muscle strength for impaired proprioceptive accuracy or high laxity, in order to stabilize the knee, could not be demonstrated., (Copyright © 2012 by the American College of Rheumatology.)

Objective: To identify subgroups or phenotypes of knee osteoarthritis (OA) patients based on similarities of clinically relevant patient characteristics, and to compare clinical outcomes of these phenotypes., Methods: Data from 842 knee OA patients of the Osteoarthritis Initiative were used. A cluster analysis method was performed, in which clusters were formed based on similarities in 4 clinically relevant, easily available variables: severity of radiographic OA, lower extremity muscle strength, body mass index, and depression. Univariable and multivariable regression analyses were used to compare phenotypes on clinical outcomes (pain and activity limitations), taking into account possible confounders., Results: Five phenotypes of knee OA patients were identified: "minimal joint disease phenotype," "strong muscle phenotype," "nonobese and weak muscle phenotype," "obese and weak muscle phenotype," and "depressive phenotype." The "depressive phenotype" and "obese and weak muscle phenotype" showed higher pain levels and more severe activity limitations than the other 3 phenotypes., Conclusion: Five phenotypes based on clinically relevant patient characteristics can be identified in the heterogeneous population of knee OA patients. These phenotypes showed different clinical outcomes. Interventions may need to be tailored to these clinical phenotypes., (Copyright © 2011 by the American College of Rheumatology.)