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The relation between static and dynamic knee stability after ACL reconstruction.

Hiroshi Higuchi1, Masanori Terauchi, Masashi Kimura

  • 1Department of Orthopaedic Surgery, Gunma University Faculty of Medicine, 3-39-22 Showa-machi, Maebashi-shi, Gunma-ken 371-8511, Japan. higuchih@med.gunma-u.ac.jp

Acta Orthopaedica Belgica
|July 26, 2003
PubMed
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ACL reconstruction significantly reduces anterior tibial translation (ATT) in knees. While the static Lachman test shows postoperative ATT differences, isokinetic exercises do not, suggesting improved knee stability after surgery.

Area of Science:

  • Orthopedics
  • Sports Medicine
  • Biomechanics

Background:

  • Anterior Cruciate Ligament (ACL) injuries are common, often leading to knee instability.
  • Quantifying anterior tibial translation (ATT) is crucial for assessing ACL reconstruction outcomes.
  • Understanding dynamic vs. static stability post-surgery informs rehabilitation strategies.

Purpose of the Study:

  • To quantify and compare ATT in ACL-reconstructed knees using static passive Lachman and isokinetic knee extension tests.
  • To evaluate ATT changes pre- and postoperatively.
  • To correlate stability measurements with functional knee scores.

Main Methods:

  • Prospective study of 49 ACL-reconstructed knees.
  • Utilized stress-radiography and an electrogoniometer system for ATT measurement.

Related Experiment Videos

  • Assessed Lysholm scores and subjective outcomes pre- and post-surgery.

    • Main Results:

    • ACL reconstruction significantly decreased ATT in both static and dynamic tests.
    • Postoperative ATT side-to-side differences were observed in the passive Lachman test but not during isokinetic extension.
    • No significant correlation found between static passive stability and functional knee scores at follow-up.

    Conclusions:

    • ACL reconstruction effectively improves anterior tibial stability.
    • The static Lachman test reveals greater side-to-side ATT differences compared to isokinetic testing post-surgery.
    • Dynamic testing may offer a more sensitive measure of stability in certain functional ranges after ACL reconstruction.