Abstract
Scaphoid non-union is commonly encountered in clinical practice. Dorsal intercalated segmental instability is the most commonly seen carpal instability in scaphoid non-union. We present a case of ununited fracture scaphoid with lunotriquetral coalition which developed volar intercalated segmental instability due to altered biomechanics. Loss of radial support and increased mass on the ulnar aspect of the carpus resulted in the lunotriquetral mass going into abnormal flexion. We have attempted to explain the complex biomechanics leading to volar intercalated segmental instability in this case.
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