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Distraction forces significantly alter normal wrist bone alignment, particularly at the radiocarpal and midcarpal joints. This study quantises carpal bone motion under static load, revealing key insights into wrist biomechanics.

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Area of Science:

  • Orthopedics
  • Biomechanics
  • Radiology

Background:

  • Wrist distraction is clinically relevant for fracture reduction, arthroscopy, and ligament testing.
  • The biomechanical effects of static distraction on the normal wrist remain understudied.

Purpose of the Study:

  • To quantify three-dimensional carpal bone conformational changes in a normal wrist under static distractive load.

Main Methods:

  • Computed tomography (CT) scans of 14 healthy volunteer wrists at rest and under 98 N distraction.
  • Markerless bone registration to track bone motion and calculate interbone distances.
  • Estimation of joint separation at radiocarpal, midcarpal, and carpometacarpal joints.

Main Results:

  • A 3.3 mm average increase in radius to third metacarpal distance under load.
  • Axial separation predominantly at radiocarpal (1.0 mm) and midcarpal (2.0 mm) joints.
  • Proximal row narrowing (0.98 mm) and greater distraction between radius and scaphoid (2.5 mm) compared to radius and lunate (1.0 mm).

Conclusions:

  • Static wrist distraction significantly impacts carpal bone conformation (p < .01).
  • External traction causes approximately twice the distraction at the lunocapitate joint compared to the radiolunate joint.