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A non-invasive method for studying in vivo carpal kinematics
S W Wolfe1, J J Crisco, L D Katz
1Yale University School of Medicine, New Haven CT, USA.
Journal of Hand Surgery (Edinburgh, Scotland)
|April 1, 1997
Summary
Scapholunate ligament tears significantly increase lunocapitate motion in the wrist. This altered motion occurs because the midcarpal joint compensates for the disrupted radiocarpal joint in injured wrists.
Area of Science:
- Orthopedics
- Biomechanics
- Radiology
Background:
- Scapholunate ligament injuries are common causes of wrist instability.
- Understanding altered wrist biomechanics after injury is crucial for diagnosis and treatment.
Purpose of the Study:
- To quantify wrist motion changes in patients with scapholunate ligament tears using computed tomography (CT).
- To compare radiocarpal and midcarpal joint motion in uninjured versus injured wrists.
Main Methods:
- Midsagittal CT images were acquired from 7 uninjured and 3 injured patients with confirmed scapholunate ligament tears.
- CT bony contours were digitized, and motion was analyzed using an automated contour-matching algorithm.
- Wrist motion was expressed as a ratio of lunocapitate (midcarpal) to radiolunate (radiocarpal) motion.
Main Results:
- In normal wrists, radiocarpal and midcarpal motion were equal.
- In wrists with scapholunate ligament disruption, lunocapitate (midcarpal) motion significantly increased across the entire range of motion.
Conclusions:
- Scapholunate ligament tears lead to altered wrist biomechanics, characterized by increased midcarpal joint motion.
- These findings highlight the compensatory mechanisms in the wrist following scapholunate ligament injury.