For patients with knee OA there is limited evidence that a lower level of physical function is associated with a lower level of physical activity .
There is also limited evidence that depression is not associated with the level of physical activity .
For patients with hip OA there is limited evidence that higher age , higher body mass index ( BMI ) and a low level of physical function is associated with a low level of physical activity .
CONCLUSION A high age ( hip OA ) , a high BMI ( hip OA ) and a low level of physical function ( both hip and knee OA ) are related to a low level of physical activity .
OBJECTIVE To give an overview of factors related to the level of physical activity  in patients with hip or knee osteoarthritis ( OA ) .
Physical activity levels and functional performance in the osteoarthritis initiative: a graded relationship.
OBJECTIVE Physical activity improves function in adults with arthritis , but it is unknown if there is a grade d relationship between physical activity and functional benefit . This study was undertaken to examine the cross-sectional and longitudinal relationship between self-reported physical activity and observed functional performance in adults with knee osteoarthritis ( OA ) . METHODS The Osteoarthritis Initiative cohort included 2,589 patients with knee OA ( 2,301 with longitudinal followup data ) who were ages 45 - 79 years at baseline . Prospect i ve annual functional performance was assessed for 2 years using timed 20-meter walk tests .  We used linear regression to estimate differences across physical activity quartiles in subsequent function ( baseline and 1-year activity predicts 1-year and 2-year function , respectively ) adjusted for demographic factors ( age , sex , race/ethnicity , education level , and marital status ) and health factors ( OA severity , knee symptoms , knee pain , knee injury , body mass index , comorbidity , depression , smoking , alcohol use , and other joint pain ) . RESULTS Increasing physical activity levels had a significant grade d relationship to functional performance . Adults in physical activity quartile groups from least active to most active had an average gait speed of 4.0 , 4.2 , 4.3 , and 4.5 feet/second , respectively , at baseline ( P for trend<0.001 ) and 4.0 , 4.2 , 4.3 , and 4.5 feet/second , respectively , after 1 year ( P for trend<0.001 ) ; increasing trends remained significant after adjusting for covariates . Findings were similar within sex and age groups . CONCLUSION These prospect i ve data indicate a consistent grade d relationship between physical activity level and better performance in adults with knee OA . These findings support guidelines that encourage patients with arthritis who can not attain minimum recommended physical activity to be as active as possible
For patients with knee OA there is limited evidence that a lower level of physical function is associated with a lower level of physical activity .
There is also limited evidence that depression is not associated with the level of physical activity .
For patients with hip OA there is limited evidence that higher age , higher body mass index ( BMI ) and a low level of physical function is associated with a low level of physical activity .
CONCLUSION A high age ( hip OA ) , a high BMI ( hip OA ) and a low level of physical function ( both hip and knee OA ) are related to a low level of physical activity .
OBJECTIVE To give an overview of factors related to the level of physical activity  in patients with hip or knee osteoarthritis ( OA ) .