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Updated: Jun 20, 2026

Polytetrafluoroethylene (PTFE) as a Suture Material in Tendon Surgery
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Polytetrafluoroethylene (PTFE) as a Suture Material in Tendon Surgery

Published on: October 6, 2022

Extensor mechanism ruptures.

Peter Brooks1

  • 1Cleveland Clinic, 9500 Euclid Avenue, Cleveland, OH 44195, USA.

Orthopedics
|September 16, 2009
PubMed
Summary
This summary is machine-generated.

Extensor mechanism ruptures, including quadriceps and patellar tendon tears, can compromise total knee replacements (TKR). Surgical repair is challenging, with allograft reconstruction often needed for patellar tendon ruptures.

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Published on: May 11, 2011

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Musculoskeletal Research

Background:

  • The knee extensor mechanism, crucial for function, comprises the quadriceps, patella, patellar tendon, and tibial tubercle.
  • Disruptions to this mechanism, especially after total knee replacement (TKR), can lead to significant morbidity and functional loss.
  • Quadriceps tears and patellar tendon ruptures are particularly challenging complications following TKR.

Purpose of the Study:

  • To review the complexities of extensor mechanism ruptures in the context of total knee replacement.
  • To discuss current treatment strategies and outcomes for quadriceps and patellar tendon injuries post-TKR.
  • To highlight preventative measures and reconstructive techniques for extensor mechanism failures.

Main Methods:

  • Literature review of extensor mechanism injuries associated with total knee replacement.
  • Analysis of surgical techniques for quadriceps tears, including transosseous sutures.
  • Evaluation of methods for treating patellar tendon ruptures, including primary repair and allograft reconstruction.

Main Results:

  • Quadriceps tears after TKR have a poorer prognosis than in native knees, with transosseous sutures recommended.
  • Patellar tendon ruptures are the most common and serious extensor mechanism disruption post-TKR.
  • Allograft reconstruction, particularly with Achilles tendon, is often necessary for established patellar tendon ruptures.

Conclusions:

  • Prevention through careful surgical technique during primary and revision TKR is paramount.
  • Treatment of extensor mechanism ruptures, especially patellar tendon tears, requires advanced reconstructive techniques.
  • Allograft reconstruction provides a viable option for complex patellar tendon ruptures, restoring knee function.