Several individual RCTs demonstrated clinical ly important improvements in pain and disability with aerobic exercise .
Other PT interventions demonstrated no sustained benefit .
Individual RCTs showed similar benefits with aerobic , aquatic , and strengthening exercise .
Adverse events were uncommon and did not deter participants from continuing treatment .
Low-strength evidence suggested that only a few PT interventions were effective .
BACKGROUND Osteoarthritis is a leading cause of disability .
Nonsurgical treatment is a key first step .
PURPOSE Systematic literature review of physical therapy ( PT ) interventions for community-dwelling adults with knee osteoarthritis .
Compliance to exercise therapy in older participants with knee osteoarthritis: implications for treating disability.
This investigation examined predictors of compliance with exercise therapy in a clinical trial involving older adults with knee osteoarthritis ( OA ) . The study sample was partitioned into tertiles by level of compliance to determine its effect on several clinical outcome measures in the trial ( i.e. , knee pain , difficulty with activities of daily living , and performance-related disability ) . The participants ( N = 439 ) first completed all baseline assessment s and were then r and omly assigned to one of three treatment conditions : health education control , aerobic exercise , or resistance exercise . The two exercise treatments involved a 3-month center-based phase and a 15-month home-based phase . Variables in five categories ( i.e. , demographic , fitness , health-related quality of life , performance-related disability , and prior exercise behavior ) were entered as predictors of attendance and time spent exercising  during each session for three different periods of time across the course of the study . Results of these analyses revealed that it was possible to explain more variance for time spent exercising ( approximately 40 % ) during the first 3 months than for attendance ( approximately 10 % ) . Furthermore , once participants completed the first 3 months of their training , prior behavior was the strongest predictor of exercise compliance . In most cases , the regression models accounted anywhere from 26 to 46 % of the variance in attendance or time spent exercising ( 7 of the 8 P values < 0.01 ) . In general , demographic , fitness , psychosocial , and disability-related measures did not predict compliance with any consistency across the various phases of the trial . Analysis of the dose-response data suggest that , in the use of aerobic exercise to deter disability in older people with knee OA , consideration should be given to prescribing frequent bouts of activity ( at least 3 times each week ) of moderate duration ( approximately 35 min )
Several individual RCTs demonstrated clinical ly important improvements in pain and disability with aerobic exercise .
Other PT interventions demonstrated no sustained benefit .
Individual RCTs showed similar benefits with aerobic , aquatic , and strengthening exercise .
Adverse events were uncommon and did not deter participants from continuing treatment .
Low-strength evidence suggested that only a few PT interventions were effective .
BACKGROUND Osteoarthritis is a leading cause of disability .
Nonsurgical treatment is a key first step .
PURPOSE Systematic literature review of physical therapy ( PT ) interventions for community-dwelling adults with knee osteoarthritis .