From the case:
Progressive perilunate instability (diagram)
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The arrow indicates the sequence of traumatic injury in progressive perilunate instability.
Case Discussion
Mayfield 1 described 4 stages of progressive injury to the ligaments surrounding the lunate leading to carpal instability:
- stage I: scapholunate dissociation
- stage II: perilunate dislocation
- stage III: midcarpal dislocation
- stage IV: lunate dislocation