Chinese Journal of Tissue Engineering Research

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Biomechanical measurement system for measuring frictional properties of synovial joint after cartilage injury

Mu Yi-ping1, Otto Muller2, Nicolas Wullker2   

  1. 1 Feng Tian Hospital Affiliated to Shenyang Medical College, Shenyang  110024, Liaoning Province, China
    2 Tuebingen University, Baden-Wuerttemberg Tuebingen  72076, Germany
  • Received:2013-04-27 Revised:2013-05-30 Online:2013-06-25 Published:2013-06-25
  • Contact: Nicolas Wullker, Doctor, Professor, Tuebingen University, Baden-Wuerttemberg Tuebingen 72076, Germany NicolasWullker@live.com
  • About author:Mu Yi-ping☆, Doctor, Attending physician, Feng Tian Hospital Affiliated to Shenyang Medical College, Shenyang 110024, Liaoning Province, China yiping.mu@163.com

Abstract:

BACKGROUND: Osteoarthritis will change the frictional factor and performance of synovial joints. There is no perfect system to objectively measure and evaluate the fractional properties of synovial joints.
OBJECTIVE: To observe the changes of fractional properties of synovial joints under different pressure conditions with biomechanical measurement system.
METHODS: A sheep’s wrist joint was fixed in the biomechanical measurement system to measure the friction properties. Each sample was tested in four different axial loading conditions: 100 N, 200 N, 400 N and 800 N axial forces that vertical to the joint articular surface, in order to measure the torque and the coefficient by whirligig the joint for 5°. After measurement, 16 mm2 cartilage defects were made in each specimen. Then the torque and the coefficient were measured under 100 N, 200 N, 400 N and 800 N axial forces.
RESULTS AND CONCLUSION: The torque of sheep wrist joint was 0.021 7, 0.031 7, 0.063 0 and 0.145 0 N•m respectively, and the coefficient of fraction was 0.006 7, 0.007 3, 0.012 0 and 0.014 5 μ when it was loaded by four different axial forces without cartilage defect. The torque of sheep wrist joint was 0.027 0, 0.041 7, 0.080 6 and 0.172 4 N•m respectively, and the coefficient of fraction was 0.008 6, 0.009 7, 0.013 7 and 0.016 4 μ when it was loaded by four different axial forces with cartilage defect. The torque and the coefficient of fraction were gradually increased with the increasing of loading forces (P < 0.05), and the articular cartilage defects may lead to the increasing of joint torque and the coefficient of fraction (P < 0.05). The joint torque was positively correlated with coefficient of fraction.

Key words: bone and joint implants, bone and joint biomechanics, joint tribology, friction factor, osteoarthritis, cartilage defects, biomechanical measurement system, joint pressure, torque, articular cartilage degenerative diseases, synovial

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