Knee brace design based on screw axes of knee joint motions

Fong-chin Su, Chun Shyan Liao

Research output: Contribution to journalArticlepeer-review


To achieve better ligament protection and kinematic compatibility and to reduce pistoning forces, the knee brace is required to reproduce realistic normal knee motion. The normal knee motion during squatting was studied and the results applied to knee brace design. In order to study the six degrees of freedom movements of the knee joint, this study used finite screw axes estimated from low-pass smoothed video data. Knee kinematics was measured and computed for twelve males during squatting activity. The data were normalized to a squat cycle and the results of six trials were averaged and expressed in terms of both Eulerian rotations and displacements and screw axes parameters. The results showed that the most significant motions were internal rotation of the tibia and posterior translation of the femur with knee flexion. The varus rotation and femur compression were also evident. The posterior and compression translations were greater for the lateral epicondyle than medial epicondyle of the femur. A knee brace was then designed and manufactured to mimic the average knee motion during flexion. Its future clinical evaluation is necessary.

Original languageEnglish
Pages (from-to)31-42
Number of pages12
JournalBiomedical Engineering - Applications, Basis and Communications
Issue number1
Publication statusPublished - 1995 Jan 1

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Bioengineering
  • Biomedical Engineering


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