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Related Experiment Videos

Primary total knee arthroplasty after patellectomy

S D Martin1, S B Haas, J N Insall

  • 1Knee Service, New York Hospital--Cornell University Medical Center, New York City, USA.

The Journal of Bone and Joint Surgery. American Volume
|September 1, 1995
PubMed
Summary
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Total knee replacement after patellectomy shows improved outcomes with longer intervals between surgeries. Longer waits correlate with higher knee scores, indicating better function and pain relief for patients.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Patellectomy, the surgical removal of the kneecap, can lead to knee instability and pain.
  • Total knee replacement (TKR) is a common procedure for advanced knee osteoarthritis.
  • The long-term outcomes of TKR following prior patellectomy are not well-established.

Purpose of the Study:

  • To retrospectively review the outcomes of primary total knee replacements performed after patellectomy.
  • To evaluate the impact of the time interval between patellectomy and TKR on patient outcomes.
  • To compare the effectiveness of different prosthetic types in this patient cohort.

Main Methods:

  • Retrospective review of 22 primary total knee replacements in patients who previously underwent patellectomy.
  • Analysis of patient demographics, surgical details, and postoperative outcomes using the Hospital for Special Surgery (HSS) knee score.

Related Experiment Videos

  • Comparison of outcomes based on prosthesis type and time elapsed since patellectomy.

    • Main Results:

    • Postoperative HSS knee scores improved significantly compared to preoperative scores (average 76 vs. 46).
    • A direct correlation was found between the interval since patellectomy and postoperative knee score (r=0.78, p<0.001).
    • Insall-Burstein posterior stabilized prostheses showed better pain and function scores than Total Condylar I prostheses.

    Conclusions:

    • Total knee replacement is a viable option for patients with a history of patellectomy, offering significant functional improvement.
    • A longer time interval between patellectomy and TKR is associated with superior postoperative outcomes.
    • Prosthesis selection may influence specific aspects of functional recovery, with posterior stabilized designs showing promise.