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Related Experiment Videos

Carpal dislocations: pathomechanics and progressive perilunar instability

J K Mayfield, R P Johnson, R K Kilcoyne

    The Journal of Hand Surgery
    |May 1, 1980
    PubMed
    Summary
    This summary is machine-generated.

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    Perilunate and lunate dislocations result from specific ligament damage and wrist extension, ulnar deviation, and supination. Understanding perilunar instability (PLI) stages is key for treating carpal instability.

    Area of Science:

    • Orthopedic Surgery
    • Biomechanics
    • Hand and Wrist Anatomy

    Background:

    • Perilunate and lunate dislocations are complex wrist injuries.
    • Understanding the pathomechanics and ligamentous damage is crucial for diagnosis and treatment.

    Purpose of the Study:

    • To analyze the pathomechanics, ligamentous damage, and carpal instability in perilunate and lunate dislocations.
    • To classify perilunar instability (PLI) based on experimental findings.

    Main Methods:

    • Experimentally loaded 32 cadaver wrists to failure.
    • Induced perilunate and lunate dislocations.
    • Classified dislocations by degree of perilunar instability (PLI).

    Main Results:

    • Dislocations occurred sequentially due to progressive ligamentous disruptions.

    Related Experiment Videos

  • Stage I PLI (scapholunate diastasis) showed least instability; Stage IV PLI (lunate dislocations) showed most.
  • Radial styloid fractures and scaphoid rotation were observed due to specific ligament ruptures.

    • Conclusions:

    • The mechanism of injury involves wrist extension, ulnar deviation, and intercarpal supination.
    • Reduction can be achieved by reversing the injury mechanism.
    • Stress roentgenograms aid in assessing carpal instability.