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Related Experiment Videos

Patellar thickness in total knee replacement

C C Jiang1, K M Yip, D H Liu

  • 1Department of Orthopedic Surgery, National Taiwan University Hospital, Taipei, R.O.C.

Journal of the Formosan Medical Association = Taiwan Yi Zhi
|May 1, 1994
PubMed
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Patellar thickness changes after total knee replacement (TKR) are common. Careful surgical technique, like using a patellar cutting jig, helps manage patellar thickness and prevent instability after TKR.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Knee Arthroplasty

Background:

  • Patellar thickness is a critical factor in total knee replacement (TKR) outcomes.
  • Variations in patellar thickness post-TKR can influence joint stability and function.
  • Understanding these changes is essential for optimizing surgical techniques and patient results.

Purpose of the Study:

  • To evaluate changes in patellar thickness following total knee replacement (TKR).
  • To assess the incidence of patellar instability and its association with prosthesis type and surgical procedures.
  • To identify factors influencing patellar thickness and outcomes after TKR.

Main Methods:

  • Retrospective analysis of 294 total knee replacements (TKRs) performed between November 1989 and June 1993.

Related Experiment Videos

  • Comparison of patellar thickness before and after TKR, utilizing Tricon-M and PCA prostheses.
  • Evaluation of patellar component fixation (cemented) and associated procedures like lateral retinacular release.

    • Main Results:

    • Average preoperative patellar thickness was 21.2 mm; thickness was preserved in some knees, slightly increased in others, and decreased in a significant portion.
    • Patellar subluxation/dislocation occurred in 13 knees, primarily with the Tricon-M prosthesis, with a mean onset of eight months post-TKR.
    • Lateral retinacular release was more frequent with the Tricon-M prosthesis compared to the PCA prosthesis.

    Conclusions:

    • Patellar thickness can vary after TKR, with a notable proportion experiencing a decrease.
    • Patellar instability, though infrequent, was associated with specific prostheses and surgical approaches.
    • Utilizing a patellar cutting jig may improve control over patellar thickness, especially for smaller patellae, potentially reducing complications.