Hip adduction and knee valgus during running: an issue of muscle strength or bony morphology?

Excessive hip adduction and knee valgus are common movement impairments that underlie various lower-limb injuries in runners. The purpose of the current study was to determine the associations among frontal plane hip and knee kinematics during running, hip abductor strength, and pelvis width. Results revealed that the width of the lower pelvis (measured as the bilateral hip joint center distance), as opposed to hip abductor strength, was predictive of peak hip adduction and knee valgus during running.