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Related Experiment Videos

Hamstring and patellar tendon graft response to cyclical loading

P T Simonian1, R J Williams, X H Deng

  • 1Sports Medicine Service, the Hospital for Special Surgery, New York, New York, USA.

The American Journal of Knee Surgery
|May 20, 1998
PubMed
Summary
This summary is machine-generated.

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Patellar tendon and hamstring tendon grafts show similar biomechanical properties under cyclical loading. This supports the use of either graft for anterior cruciate ligament (ACL) reconstruction, aligning with positive clinical outcomes.

Area of Science:

  • Biomechanics
  • Orthopedic Surgery
  • Tendon Graft Research

Background:

  • Anterior cruciate ligament (ACL) reconstruction commonly utilizes autografts.
  • Patellar tendon and hamstring tendons (semitendinosus and gracilis) are frequent graft choices.
  • Understanding the biomechanical properties of these grafts under load is crucial for surgical success.

Purpose of the Study:

  • To compare the biomechanical effects of submaximal cyclical loads on the patellar tendon versus doubled semitendinosus and gracilis tendons.
  • To evaluate graft suitability for ACL reconstruction based on mechanical response.

Main Methods:

  • Six fresh-frozen cadaveric knee specimens were utilized.
  • Central 10 mm of patellar tendon was compared with doubled semitendinosus and gracilis tendons.

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  • Specimens underwent 1000 cycles of loading from 0 to 300 N at 1 Hz under load control.

    • Main Results:

    • No significant difference in cross-sectional area between the patellar tendon (mean 44.4 mm²) and four-strand hamstring tendon (mean 47.5 mm²).
    • No significant differences in strain, stress, or modulus were observed after cyclic loading.
    • Both graft types demonstrated comparable mechanical behavior under the tested conditions.

    Conclusions:

    • The biomechanical properties of the central patellar tendon and doubled hamstring tendons are similar under cyclical loading.
    • These findings support the clinical efficacy of both graft sources for ACL reconstruction.
    • The study validates the use of either graft type, contributing to informed surgical decision-making.