A new protocol from real joint motion data for wear simulation in total knee arthroplasty: stair climbing

Med Eng Phys. 2014 Dec;36(12):1605-10. doi: 10.1016/j.medengphy.2014.08.010. Epub 2014 Sep 18.

Abstract

In its normal lifespan, a knee prosthesis must bear highly demanding loading conditions, going beyond the sole activity of level walking required by ISO standard 14243. We have developed a protocol for in vitro wear simulation of stair climbing on a displacement controlled knee simulator. The flexion/extension angle, intra/extra rotation angle, and antero/posterior translation were obtained in patients by three-dimensional video-fluoroscopy. Axial load data were collected by gait analysis. Kinematics and load data revealed a good consistence across patients, in spite of the different prosthesis size. The protocol was then implemented and tested on a displacement controlled knee wear simulator, showing an accurate reproduction of stair climbing waveforms with a relative error lower than 5%.

Keywords: Daily activity; Gait analyses; Stair climbing; Total knee arthroplasty; Wear simulation.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Activities of Daily Living*
  • Arthroplasty, Replacement, Knee
  • Biomechanical Phenomena
  • Computer Simulation
  • Equipment Failure Analysis / methods*
  • Fluoroscopy
  • Follow-Up Studies
  • Humans
  • Imaging, Three-Dimensional
  • Knee Joint / physiopathology*
  • Knee Joint / surgery
  • Knee Prosthesis*
  • Locomotion / physiology*
  • Models, Biological*
  • Prosthesis Design
  • Video Recording