Hip flexion range of motion and physical function in hip osteoarthritis: Mediating effects of hip extensor strength and pain

Abstract

Hip flexion range of motion (ROM), hip extensor strength (torque production), and hip pain are important correlates of physical function in individuals with hip osteoarthritis (OA). However, the relationships among these variables remain unclear. The purpose of this study was to examine whether hip extensor strength and hip pain mediate the association between hip flexion ROM and physical function. Methods. Participants were 100 adults (mean age 62 years) with radiographically confirmed hip OA. Passive hip flexion ROM was measured using a digital inclinometer, and isometric hip extensor strength was measured using a force transducer. Self-report measures of physical function and pain were as..