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KMID : 0869020090120020060
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Journal of Korean Orthopaedic Research Society
2009 Volume.12 No. 2 p.60 ~ p.67
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Effect of Ball Joint Location in External Fixator on Wrist Motion in Distal Radius Fractures
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Moon Sang-Ho
Lee Ji-Hoon
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Abstract
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Purpose: The effects of ball joint location from axis of rotation on postoperative wrist motion in dynamic external fixator for displaced intra-articular fractures in distal radius were evaluated.
Materials and Methods: 33 patients who had dynamic external fixative surgery after closed reduction within acceptable range and could be followed at least 1 year were reviewed. They were divided into two groups according to distance (5 mm, 10 mm) of ball joint center from axis of wrist rotation which located in proximal cortex of capitate. These groups were compared by clinical results which were evaluated by range of motion of wrist (flexion, extension, radial deviation, ulnar deviation, pronation, supination) and pain evaluation system. They were also divided into two groups according to direction of ball joint migration (proximal, distal) and evaluated by the same methods.
Results: No difference in range of motion and pain was observed between distance 0 mm-5 mm group and >5 mm group (p>0.05). Distance 0 mm-10 mm group showed statistically significant more range of motion in extension, supination and pronation than >10mm group (p<0.05). However, there was no significant difference in flexion, radial deviation, ulnar deviation and pain (p>0.05). Also no difference in range of motion and pain was observed between proximal migration group and distal group (p>0.05).
Discussion and Conclusion: In retrospective analysis of dynamic external fixator, range of wrist motion should be preserved by decrease of changes of ball joint location within 10mm from center of rotation.
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KEYWORD
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Distal radius, Ball joint location, Intra-articular fracture, Dynamic external fixator
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