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Related Experiment Videos

Knee joint muscle function after patellectomy: how important are the hamstrings?

M Kuster1, G Blatter

  • 1Klinik für Orthopädische Chirurgie, Kantonsspital, St. Gallen, Switzerland.

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA
|January 1, 1996
PubMed
Summary
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Long-term patellectomy can impair quadriceps and hamstring function. Hamstring strength at 60 deg/s predicts clinical outcomes, aiding preoperative assessment and rehabilitation guidance.

Area of Science:

  • Orthopedic Surgery
  • Sports Medicine
  • Biomechanics

Background:

  • Unilateral patellectomy, the surgical removal of the kneecap, can impact knee joint function.
  • Assessing long-term functional outcomes after patellectomy is crucial for patient recovery and rehabilitation.

Purpose of the Study:

  • To evaluate the long-term (9-year) functional muscle performance after unilateral patellectomy.
  • To determine the correlation between quadriceps and hamstring muscle function and clinical outcomes.
  • To identify reliable indicators for preoperative assessment and rehabilitation guidelines.

Main Methods:

  • Isokinetic dynamometry (Cybex II) was used to test 23 patients 9 years post-surgery.
  • Muscle function (quadriceps and hamstrings) was compared between the operated and unoperated knee at 60 deg/s.

Related Experiment Videos

  • Clinical results were assessed and correlated with muscle function measurements.

    • Main Results:

    • A significant correlation (R=0.7, P<0.001) was found between quadriceps and hamstring muscle function loss at 60 deg/s.
    • Loss of quadriceps function <40% correlated with preserved hamstring function and good/excellent clinical results.
    • Loss of quadriceps function >40% led to proportional loss of flexion torque, indicating broader functional impairment.
    • Peak flexion torque loss >30% was associated with unsatisfactory clinical outcomes.

    Conclusions:

    • Hamstring muscle function, specifically peak flexion moment at 60 deg/s, is a reliable predictor of clinical outcomes post-patellectomy.
    • Measuring hamstring strength can serve as a valuable tool for preoperative assessment.
    • This evaluation provides essential guidelines for optimizing rehabilitation strategies after patellectomy.