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Related Experiment Video

Updated: Feb 10, 2026

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Patellar tracking in primary total knee arthroplasty.

Simon Donell1

  • 1Norwich Medical School, Faculty of Medicine and Health Sciences, University of East Anglia, UK.

EFORT Open Reviews
|May 22, 2018
PubMed
Summary

This review found that while pre-existing patellar tracking and implant alignment are key, patellar shape prevents normal knee kinematics after total knee arthroplasty (TKA). Current literature offers no new insights to alter established TKA practices for patellar tracking.

Keywords:
femoral rotationimplant alignmentpatellar kinematicsreviewtotal knee arthroplasty

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Knee joint kinematics

Background:

  • Patellar tracking is crucial for function after total knee arthroplasty (TKA).
  • Factors influencing patellar tracking include pre-existing conditions and implant alignment.
  • Patellar shape significantly impacts detailed patellar movements post-TKA.

Purpose of the Study:

  • To review recent literature on factors affecting patellar tracking after TKA.
  • To assess if new findings necessitate changes in clinical practice for TKA.
  • To understand the limitations of current research methodologies.

Main Methods:

  • Literature review of recent studies on TKA patellar tracking.
  • Analysis of biomechanical factors influencing patellar kinematics.
  • Evaluation of cadaveric study limitations in replicating clinical TKA scenarios.

Main Results:

  • Pre-existing patellar tracking and rotational implant alignment are primary determinants.
  • Patellar shape dictates specific kinematics, preventing a return to normal function post-TKA.
  • Cadaveric studies may not accurately reflect in-vivo TKA performance due to testing conditions.

Conclusions:

  • Recent literature has not introduced significant changes to established clinical practices for TKA.
  • Achieving completely normal patellar kinematics after TKA remains unlikely due to anatomical factors.
  • Clinical focus should remain on optimizing alignment and considering pre-existing conditions for satisfactory outcomes.