J022021 Frictional and Viscoelastic Properties of Knee Joint Cartilage by Pendulum Test

Abstract

Osteoarthritis (OA) is the most common degenerative joint disease in the field of orthopaedics. In advanced stages of OA, the patients suffer from severe pain, functional limitations in the affected joints, and restriction of mobility. For detecting early OA and the prevention of progression in OA by novel therapeutic strategies, they are important to understand the functional properties of synovial joint and to establish the precise measurement technique. Pendulum friction test is one of the mechanical evaluations for lubrication properties of joints. The advantages of this method are the natural motion without the constraints of joint and also preservation of the joint capsule, the synovial fluid in it and the tendons and ligaments around the knee. In this study, in addition to the friction properties, the viscous and elastic effects were evaluated. The equation of motion of joint cartilage were proposed including the friction, viscous and elastic effect. The each mechanical parameters were identified by fitting the damping oscillation curve measured by pendulum terster with two laser displacement sensors and an accelerometer.