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Related Experiment Videos

Predicting patellar failure after total knee arthroplasty.

John B Meding1, Mark D Fish, Michael E Berend

  • 1The Center for Knee and Hip Surgery, 1199 Hadley Road, Mooresville, IN 46158, USA. jmeding@msn.com

Clinical Orthopaedics and Related Research
|August 21, 2008
PubMed
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Patient and surgeon factors increase the risk of patellar component failure after total knee arthroplasty (TKA). Identifying these risks can refine surgical techniques and indications for TKA to improve outcomes.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Prosthetics

Background:

  • Patellar component failure is a significant concern in total knee arthroplasty (TKA).
  • Understanding risk factors is crucial for improving long-term implant survival and patient outcomes.

Purpose of the Study:

  • To identify patient and surgeon-related factors associated with patellar component failure after posterior cruciate ligament-retaining TKA.
  • To analyze the risks of patellar loosening, fracture, and revision.

Main Methods:

  • Retrospective analysis of 8530 TKAs performed between 1983 and 2003.
  • Kaplan-Meier and Cox regression analysis to determine risk factors for patellar failure.
  • Exclusion of all infected cases.

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Main Results:

  • Patellar loosening occurred in 4.8% and fracture in 5.2% of TKAs.
  • Lateral release and high body mass index (>30 kg/m²) increased loosening and fracture risk, respectively.
  • Male gender, preoperative varus alignment, and larger component size were linked to patellar fracture.

Conclusions:

  • Specific patient (BMI, gender, alignment) and surgical (lateral release, component position/size, tibial thickness) factors predict patellar failure.
  • Awareness of these factors can guide surgical decisions and technique selection for TKA.
  • This knowledge may help optimize indications for TKA and improve prosthesis longevity.