Kinematic variation and pain in dynamic knee collapse

Kinematics and its relationship to pain following corrective instruction during single leg squats.

Dynamic knee collapse is often cited as one of the primary contributors to the development of patellofemoral pain (PFP).  Altered hip and knee mechanics theoretically increases the stress on the patellofemoral joint by decreasing the magnitude of the contact surface of the patella during motion. Previous research has shown that when instructed to correct, patients with PFP were able to alter hip and knee segments however little to no information is available regarding the pelvis, femur, and tibia to hip and knee mechanics. Considering this, the authors of the present study sought to determine any kinematic differences before and after corrective instruction of dynamic knee collapse in patients with PFP as well as if there was a pain reduction associated with improved segment kinematics. It was shown that after instruction there was decreased adduction at both the pelvis and the femur and that pain levels were associated with kinematics moving in the direction opposite to the dynamic knee collapse.


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