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Condylar-Stabilized TKR May Not Fully Compensate for PCL-Deficiency: An In Vitro Cadaver Study.

Ryan Willing1, Alireza Moslemian1, Geofrey Yamomo1

  • 1Department of Mechanical and Materials Engineering, Western University, London, Ontario, Canada.

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|June 18, 2019
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Summary
This summary is machine-generated.

Condylar-stabilized (CS) total knee replacement (TKR) may not adequately stabilize knees with posterior cruciate ligament (PCL) deficiency. This study found CS TKR reduced anterior-posterior stability compared to cruciate-retaining (CR) TKR.

Keywords:
arthroplastybiomechanicsligamentstabilitytotal knee replacement

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Area of Science:

  • Orthopaedic biomechanics
  • Biomaterials science
  • Surgical innovation

Background:

  • Increased-congruency bearings in total knee replacement (TKR) aim to address posterior cruciate ligament (PCL) deficiency.
  • The efficacy of these designs in restoring knee stability remains a subject of debate.

Purpose of the Study:

  • To compare the in vitro knee joint kinematics and stability of condylar-stabilized (CS) TKR without a PCL versus cruciate-retaining (CR) TKR.
  • To evaluate the impact of TKR designs on stability during passive motion and simulated daily activities.

Main Methods:

  • Utilized an in vitro knee joint simulator.
  • Measured kinematic changes during passive flexion-extension and simulated activities (gait, stair ascent/descent).
  • Compared intact knees, CR TKR, and CS TKR (PCL-deficient).

Main Results:

  • CS TKR exhibited significantly more posterior tibial positioning during passive flexion compared to intact and CR TKR.
  • Posterior tibial force application revealed greater posterior translation in CS TKR.
  • Significant kinematic differences were observed between TKR types and intact knees during simulated daily activities.

Conclusions:

  • PCL-deficient CS TKR demonstrates reduced anterior-posterior stability.
  • Current increased-congruency bearing designs may not fully compensate for PCL loss.
  • Further research is needed to optimize TKR designs for PCL-deficient knees.