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The false positive Lachman test

V P Kumar1, K Satku

  • 1Department of Orthopaedic Surgery, National University Hospital, Singapore.

Singapore Medical Journal
|December 1, 1993
PubMed
Summary
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A positive Lachman test can indicate a posterior cruciate ligament (PCL) injury, especially after accidents. This finding, confirmed by stress radiographs, highlights the need for caution when interpreting the Lachman test for PCL ruptures.

Area of Science:

  • Orthopedic surgery
  • Sports medicine
  • Trauma care

Background:

  • The posterior cruciate ligament (PCL) is crucial for knee stability.
  • Road traffic accidents are a common cause of knee injuries.
  • The Lachman test is a standard clinical assessment for knee ligament injuries.

Purpose of the Study:

  • To investigate the occurrence of a positive Lachman test in isolated posterior cruciate ligament injuries.
  • To evaluate the diagnostic accuracy of the Lachman test in specific injury scenarios.
  • To emphasize the importance of careful interpretation of clinical tests in diagnosing knee injuries.

Main Methods:

  • Case series of five patients with isolated PCL rupture after road traffic accidents.
  • Clinical examination including the Lachman maneuver.

Related Experiment Videos

  • Stress radiography during the Lachman maneuver to confirm PCL integrity.

    • Main Results:

    • All five patients with isolated PCL rupture demonstrated a positive Lachman test.
    • Stress radiographs confirmed the isolated nature of the PCL injury.
    • The 'sag sign' was also present, further supporting the PCL rupture diagnosis.

    Conclusions:

    • A positive Lachman test can be a sign of isolated posterior cruciate ligament injury.
    • Clinical findings like the 'sag sign' should be considered alongside the Lachman test.
    • Interpretation of the Lachman test requires caution in cases of suspected PCL rupture.