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A test for knee posterolateral rotatory instability.

R L Loomer1

  • 1University of British Columbia, Vancouver, Canada.

Clinical Orthopaedics and Related Research
|March 1, 1991
PubMed
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This study introduces a modified test for diagnosing knee posterolateral instability. The modified test enhances detection of excessive tibial external rotation and posterior tibial sag, improving diagnostic accuracy for this knee injury.

Area of Science:

  • Orthopedic surgery
  • Knee biomechanics
  • Diagnostic testing

Background:

  • Posterolateral instability is a significant knee injury.
  • Accurate diagnosis is crucial for effective treatment.
  • Existing diagnostic tests may have limitations.

Purpose of the Study:

  • To describe a modified test for knee posterolateral instability.
  • To enhance the diagnostic capability for posterolateral rotatory instability.
  • To provide a reliable clinical assessment method.

Main Methods:

  • A modification of the standard posterolateral rotatory instability test was developed.
  • Patients are positioned supine with hips and knees flexed at 90 degrees.
  • Examiners externally rotate the patient's feet to maximal external rotation.

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Main Results:

  • A positive test is indicated by excessive external rotation of the affected tibia.
  • Excessive tibial rotation is amplified and easily recognized via foot positioning.
  • A subtle yet recognizable posterior sag of the tibial tubercle is also observed.

Conclusions:

  • The modified test offers a clear method for identifying knee posterolateral instability.
  • The test's reliance on amplified tibial rotation and tibial sag enhances diagnostic sensitivity.
  • This provides a valuable tool for orthopedic assessments of knee injuries.