Gait Kinematics in Individuals with Acute and Chronic Patellofemoral Pain.

Purpose: This study aimed to identify the discriminating kinematic gait characteristics between individuals with acute and chronic patellofemoral pain (PFP), and healthy controls. Methods: Ninety-eight runners with PFP (39 male, 59 female) and 98 healthy control runners (38 male, 60 female) ran on a treadmill at a self-selected speed while three-dimensional lower limb kinematic data were collected. Runners with PFP were split into acute (n = 25) and chronic (n = 73) sub-groups based on whether they had been experiencing pain for less or greater than three months, respectively. Principal component analysis and linear discriminant analysis were used to determine the combination of kinematic gait characteristics that optimally separated individuals with acute PFP, chronic PFP, and healthy controls. Results: Compared to controls, both the acute and chronic PFP sub-groups exhibited greater knee flexion across stance and greater ankle dorsiflexion during early stance. The acute PFP sub-group demonstrated greater transverse plane hip motion across stance compared to healthy controls. In contrast, the chronic PFP sub-group demonstrated greater frontal plane hip motion, greater knee abduction, and reduced ankle eversion/greater ankle inversion across stance when compared to healthy controls. Conclusions: This study identified characteristics that discriminated between individuals with acute and chronic PFP when compared to healthy controls. Certain discriminating characteristics were shared between both the acute and chronic sub-groups when compared to healthy controls, while others were specific to the duration of PFP. (C) 2017 American College of Sports Medicine

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