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Related Experiment Videos

Mechanical evaluation of the scaphoid shift test

S W Wolfe1, J J Crisco

  • 1Department of Orthopaedics and Rehabilitation, Yale University School of Medicine, New Haven, CT 06510.

The Journal of Hand Surgery
|September 1, 1994
PubMed
Summary
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The scaphoid shift test for wrist instability can be objectively measured. Mechanical testing revealed increased scaphoid displacement and decreased stiffness in wrists with a positive scaphoid shift, indicating ligament injury.

Area of Science:

  • Orthopedics
  • Biomechanics
  • Sports Medicine

Background:

  • Manipulative examination of carpal bones is crucial for wrist assessment.
  • Abnormal carpal translation indicates ligament injury.
  • The scaphoid shift test assesses wrist instability but is subjective.

Purpose of the Study:

  • To objectively quantify scaphoid bone displacement and ligament stiffness during the scaphoid shift test.
  • To correlate mechanical findings with clinical assessment of wrist instability.

Main Methods:

  • Developed an instrument to measure load-displacement behavior of the scaphoid and its ligaments.
  • Applied a dorsal load to the scaphoid tubercle in 18 uninjured wrists.
  • Performed clinical ligament examination and mechanical testing.

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Main Results:

  • Subjects with a positive scaphoid shift demonstrated significantly increased displacement.
  • A positive scaphoid shift was associated with significantly decreased stiffness in the scaphoid ligaments.
  • Mechanical testing provides objective data on scaphoid hypermobility.

Conclusions:

  • Objective mechanical testing can quantify scaphoid hypermobility.
  • Increased displacement and decreased stiffness correlate with a positive scaphoid shift test.
  • This method may improve the diagnosis of traumatic wrist instability.