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Chronic lunotriquetral instability: diagnosis and treatment.
Journal of Hand Surgery 1993 November
Fourteen patients with chronic lunotriquetral instability were evaluated. Forced wrist extension was the most common mechanism of injury. Fourteen patients underwent lunotriquetral arthrodesis. Arthrograms were positive in 9 of the 12 performed. In three cases abnormalities not identified by arthrography were demonstrated by arthroscopy. The follow-up period averaged 27 months. X-ray films showed fusion in 12 cases. One pseudarthrosis was asymptomatic. A second pseudarthrosis required a rearthrodesis that became solid 8 weeks after surgery. One patient had persistent wrist pain. Wrist motion compared to the contralateral side averaged 85%, 88%, 83% and 80%, respectively, for flexion, extension, ulnar deviation, and radial deviation. Grip strength compared to the contralateral side averaged 93%. Lunotriquetral instability is a clinical diagnosis confirmed by arthrography or arthroscopy. Lunotriquetral fusion reliably relieves pain while maintaining functional wrist motion and grip strength. The long-term effects of lunotriquetral fusion on carpal kinematics and wrist function are unknown.
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