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Related Experiment Videos

Wrist ligament strain during external fixation: a cadaveric study.

W C Davenport1, G Miller, T W Wright

  • 1Department of Orthopaedics, University of Florida, Gainesville 32610, USA.

The Journal of Hand Surgery
|February 27, 1999
PubMed
Summary

Wrist distraction increases strain in key ligaments, potentially causing stiffness. This study measured elongation in volar radioscaphocapitate and dorsal radiotriquetral ligaments during sequential wrist distraction.

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Area of Science:

  • Orthopedic biomechanics
  • Wrist ligament anatomy
  • Cadaveric study

Background:

  • Wrist injuries often involve ligamentous damage.
  • Understanding extrinsic wrist ligament response to distraction is crucial for treatment.
  • Previous research has not quantified strain in specific extrinsic ligaments under distraction.

Purpose of the Study:

  • To quantify strain in the volar radioscaphocapitate and dorsal radiotriquetral ligaments.
  • To evaluate ligamentous strain during sequential wrist distraction using an external fixator.

Main Methods:

  • Six fresh cadaver wrists were dissected.
  • Strain gauges measured ligament elongation.
  • Sequential distraction was applied using a WristJack in 5 mm increments.

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  • X-rays confirmed distraction levels.

    • Main Results:

    • Distraction of 10 mm increased strain in both ligaments by over 20%.
    • A carpal height index increase to 0.63 correlated with a 20% strain increase.
    • Significant strain was observed in both extrinsic wrist ligaments.

    Conclusions:

    • Sequential wrist distraction induces substantial strain in extrinsic wrist ligaments.
    • This increased ligamentous strain may be a contributing factor to post-traumatic wrist stiffness.
    • Findings inform surgical techniques and rehabilitation protocols for wrist injuries.