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Related Experiment Video

Updated: May 29, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

Instability in primary total knee arthroplasty.

Daniel J Del Gaizo1, Craig J Della Valle

  • 1Rush University Medical Center, 1611 W Harrison, Chicago, IL 60611, USA.

Orthopedics
|September 10, 2011
PubMed
Summary

Total knee arthroplasty (TKA) instability presents diverse causes and symptoms. Addressing TKA instability requires identifying the root cause and applying revision principles for optimal outcomes.

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Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Instability is a primary failure mode in total knee arthroplasty (TKA).
  • TKA instability encompasses a spectrum from pain to dislocation, with varied etiologies.
  • Classification involves the location within the knee's motion arc and chronicity.

Purpose of the Study:

  • To review the classification and etiologies of TKA instability.
  • To outline diagnostic considerations for TKA instability.
  • To describe principles for revision surgery in TKA instability.

Main Methods:

  • Literature review of TKA instability.
  • Classification of instability based on presentation and chronicity.
  • Discussion of diagnostic and surgical management strategies.

Main Results:

  • Acute instability linked to intraoperative collateral ligament injury or release.
  • Chronic instability in extension often due to malalignment; in flexion, due to component sizing, tibial slope, or joint line elevation.
  • Recurvatum instability associated with extensor dysfunction or neuromuscular disorders.

Conclusions:

  • Accurate diagnosis of TKA instability requires identifying the root cause and ruling out infection or loosening.
  • Revision surgery for TKA instability necessitates restoring neutral alignment, correct rotation, balanced joint spaces, and native joint line height.

Related Experiment Videos

Last Updated: May 29, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023