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Related Experiment Video

Updated: Feb 7, 2026

Using a Knee Arthrometer to Evaluate Tissue-specific Contributions to Knee Flexion Contracture in the Rat
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Rotating hinge knee causes lower bone-implant interface stress compared to constrained condylar knee replacement.

Saeid Samiezadeh1, Habiba Bougherara2, Mansour Abolghasemian3

  • 1Orthopaedic Biomechanics Laboratory, Sunnybrook Research Institute, 2075 Bayview Avenue, Toronto, ON, M4N 3M5, Canada.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|July 25, 2018
PubMed
Summary

The rotating hinge knee (RHK) prosthesis shows lower interface stress and polyethylene stress compared to the legacy constrained condylar knee (LCCK) prosthesis. This suggests RHK may offer better implant survivorship.

Keywords:
Constrained knee prosthesisConstraintDeficiencyFinite element methodKnee arthroplastyRevision

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Area of Science:

  • Biomechanical engineering
  • Orthopedic surgery
  • Finite element analysis

Background:

  • Total knee arthroplasty (TKA) aims to restore function and alleviate pain.
  • Implant survivorship is influenced by mechanical interactions at the bone-arthroplasty interface.
  • Constrained and semi-constrained prostheses offer different stability and stress profiles.

Purpose of the Study:

  • To compare bone-arthroplasty interface stresses between constrained and semi-constrained knee prostheses.
  • To utilize finite element (FE) analysis to predict implant survivorship.
  • To evaluate the mechanical performance of rotating hinge knee (RHK) versus legacy constrained condylar knee (LCCK) designs.

Main Methods:

  • Development of three-dimensional finite element (FE) models for RHK and LCCK prostheses.
  • Simulation of knee biomechanics under conditions of medial and lateral collateral ligament deficiency.
  • Analysis of loads and stresses at the bone-implant interface in full extension.

Main Results:

  • RHK prostheses demonstrated an 18.9% decrease in average shear stress and a 19.6% decrease in average von Mises stress at the bone-implant interface compared to LCCK.
  • RHK design promoted more uniform stress distribution across the femoral and tibial interfaces.
  • Average polyethylene liner stress was reduced by 72.7% with the RHK design compared to LCCK.

Conclusions:

  • More uniform interface stress with RHK may reduce periprosthetic bone remodeling.
  • Lower polyethylene stresses in RHK designs are anticipated to decrease wear and damage.
  • RHK exhibits favorable mechanical characteristics over LCCK under specific conditions, potentially enhancing implant survivorship.