title: Effect of center of pressure modulation on knee adduction moment in medial compartment knee osteoarthritis.
abstract: The knee adduction moment (KAM) provides a major contribution to the elevated load in the medial compartment of the knee. An abnormally high KAM has been linked with the progression of knee osteoarthritis (OA). Footwear-generated biomechanical manipulations reduce the magnitude of this moment by conveying a more laterally shifted trajectory of the foot's center of pressure (COP), reducing the distance between the ground reaction force and the center of the knee joint, thus lowering the magnitude of the torque. We sought to examine the outcome of a COP shift in a cohort of female patients suffering from medial knee OA. Twenty-two female patients suffering from medial compartment knee OA underwent successive gait analysis testing and direct pedobarographic examination of the COP trajectory with a foot-worn biomechanical device allowing controlled manipulation of the COP. Modulation of the COP coronal trajectory from medial to lateral offset resulted in a significant reduction of the KAM. This trend was demonstrated in subjects with mild-to-moderate OA and in patients suffering from severe stages of the disease. Our results indicate that controlled manipulation of knee coronal kinetics in individuals suffering from medial knee OA can be facilitated by customized COP modification.
authors.affiliation: Biorobotics and Biomechanics Lab, Faculty of Mechanical Engineering, Technion-Israel Institute of Technology, Haifa, Israel. amirhaim@gmail.com
authors.forename: Amir
authors.initials: A
authors.lastname: Haim
authors.forename: Alon
authors.initials: A
authors.lastname: Wolf
authors.forename: Guy
authors.initials: G
authors.lastname: Rubin
authors.forename: Yulya
authors.initials: Y
authors.lastname: Genis
authors.forename: Mona
authors.initials: M
authors.lastname: Khoury
authors.forename: Nimrod
authors.initials: N
authors.lastname: Rozen
mesh_terms: D001696:Biomechanical Phenomena / Q000502:physiology; D005260:Female; D005684:Gait / Q000502:physiology; D006801:Humans; D007719:Knee Joint / Q000502:physiology*; D008875:Middle Aged; D009989:Orthotic Devices; D020370:Osteoarthritis, Knee / Q000503:physiopathology* / Q000534:rehabilitation*; D026741:Physical Therapy Modalities / Q000295:instrumentation*; D011312:Pressure; D011446:Prospective Studies; D012775:Shoes; D016474:Weight-Bearing / Q000502:physiology