A Comparison of in Vivo Knee Kinematics during a Leg Press Activity between Acl Deficient an D Medial Osteoarthritic Knees

INTRODUCTION: A long-term effect of chronic anterior cruciate ligament (ACL) deficiency is development of degenerative changes in the knee [1]. Andriacchi et al. [2] noted cartilage homeostasis would not be maintained by abnormal kinematics after ACL rupture and cartilage degeneration would initiate. However, no study to date has compared kinematics between ACL deficient knees and primary osteoarthritic (OA) knees. Therefore, the aim of this in vivo study was to determine if a difference in knee kinematics exists between normal, ACL deficient and primary medial OA knees. Using a leg press activity, we can examine semi weight-bearing lower limbs kinematics without complicating compensatory motions such as trunk lean, which occurs in squatting and gait.