FDM is the central hypothenar muscle. Its hook of hamate origin makes it the muscle most at risk in hook of hamate fractures, producing acute hypothenar pain on avulsion.
| Origin | Hook of hamate and flexor retinaculum |
|---|---|
| Insertion | Ulnar base of little finger proximal phalanx |
| Nerve Supply | Deep branch of ulnar nerve (C8, T1) |
| Blood Supply | Ulnar artery |
| Actions | Flexes the little finger MCP joint |
|---|
Hamate hook fractures in golfers and baseball players avulse the FDM origin. Excision of the fractured hook with FDM repair restores function. FDM pain is reproduced by the hook of hamate fracture test.
Palpable as the central hypothenar bulk during resisted little finger MCP flexion.
FDM detachment from a fractured hook producing hypothenar pain and grip weakness, managed by hook excision and FDM reattachment.
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