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Related Experiment Video

Updated: Jul 9, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

Bearing surface design changes affect contact patterns in total knee arthroplasty.

Jocelyn M Cottrell1, Elizabeth Townsend, Joseph Lipman

  • 1Biomechanics Laboratory, Hospital for Special Surgery, New York, NY 10021, USA.

Clinical Orthopaedics and Related Research
|December 7, 2007
PubMed
Summary

Design changes in knee replacements, like the Optetrak, show different wear patterns compared to older designs. Analysis of retrieved implants reveals how conformity impacts wear, suggesting improved in vivo performance.

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Knee Joint01:23

Knee Joint

The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...

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Area of Science:

  • Biomaterials Science
  • Orthopedic Surgery
  • Mechanical Engineering

Background:

  • Analysis of retrieved knee replacement implants provides insights into wear patterns.
  • Design modifications in total knee arthroplasty (TKA) aim to reduce wear and improve longevity.
  • Bearing surface conformity is a key factor influencing contact stresses and wear in TKA.

Purpose of the Study:

  • To evaluate wear patterns on retrieved tibial inserts of the Insall-Burstein II and Optetrak knee replacement designs.
  • To determine if design changes in bearing surface conformity correlate with observed wear modes and severity.
  • To assess the in vivo performance implications of design-induced changes in contact mechanics.

Main Methods:

  • Retrieved tibial inserts from 151 Insall-Burstein II and 54 Optetrak components were analyzed.

Related Experiment Videos

Last Updated: Jul 9, 2026

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty
09:31

Individualized Stem-positioning in Calcar-guided Short-stem Total Hip Arthroplasty

Published on: February 27, 2018

  • 35 matched pairs were selected based on implantation duration, BMI, and patient age.
  • Digital imaging quantified wear modes (burnishing, scratching, pitting, abrasion, creep) as a percentage of the contact area.

    • Main Results:

    • Burnishing was the most common wear mode for both designs.
    • The Optetrak design showed a greater percentage of wear involvement in 23 matched pairs.
    • Insall-Burstein II inserts implanted for over 2 years exhibited significantly more scratching, pitting, abrasion, and creep than Optetrak implants.

    Conclusions:

    • Small changes in bearing surface conformity significantly impact in vivo wear patterns.
    • The Optetrak design appears to exhibit reduced wear compared to the Insall-Burstein II, particularly for longer implantation periods.
    • Wear analysis of retrieved implants validates predictive models of contact stresses and in vivo performance.