Carpal Instability
A 35-year-old man presents with persistent dorsal wrist pain following a fall onto his outstretched hand 6 months ago. He has weakness with gripping and a clunking sensation. Examination reveals tenderness over the dorsal scapholunate interval and a positive Watson test. Radiographs show a scapholunate gap of 5mm and a scapholunate angle of 75 degrees. Regarding scapholunate dissociation and dorsal intercalated segment instability (DISI):
Mark each as TRUE or FALSE
The scapholunate ligament is the primary stabilizer of the scapholunate joint; it has three componen...
DISI (Dorsal Intercalated Segment Instability) occurs when the scapholunate ligament ruptures - the ...
The volar portion of the scapholunate ligament is strongest; rupture occurs from wrist flexion and r...
The Watson (scaphoid shift) test reproduces dorsal wrist pain and clunk as the examiner applies palm...
Treatment depends on stage and chronicity: acute complete tears may be repaired with or without dors...
Answer the questions to see explanations
Click T (True) or F (False) for each option