Quantitative, Comparative Assessment of Gait Between Single-Radius and Multi-Radius Total Knee Arthroplasty Designs

J Arthroplasty. 2015 Jun;30(6):1062-7. doi: 10.1016/j.arth.2015.01.014. Epub 2015 Jan 21.


Gait of single-radius (SR, n=16) and multi-radius (MR, n=16) posterior stabilized total knee arthroplasties was compared, along with controls (n=16), pre-op and 1 year post-op. Computer navigation and standard order sets controlled confounding variables. Post-operatively, SR knees did not differ from controls while MR knees continued to differ in important knee kinetic and kinematic properties. MR knees remained more extended (P=0.019) and had decreased power absorption (P=0.0001) during weight acceptance compared to the SR knees. Both surgical groups had similar KSS for Knee Scores (P=0.22) and Function Scores (P=0.58). The significant biomechanical differences are likely influenced by patella-femoral moment arm geometry and changing ligament laxity throughout the active range of motion.

Keywords: arthroplasty; gait; implant design; knee; radius.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Aged
  • Arthroplasty, Replacement, Knee / methods*
  • Biomechanical Phenomena
  • Case-Control Studies
  • Female
  • Femur / surgery
  • Gait*
  • Humans
  • Knee Joint / surgery
  • Knee Prosthesis*
  • Male
  • Middle Aged
  • Patella / surgery
  • Radius
  • Range of Motion, Articular*