The index finger slip of EDC is the most radial of the four slips, supplemented by the EIP which lies ulnar to it in the same compartment.
| Origin | Lateral epicondyle — common extensor origin |
|---|---|
| Insertion | Dorsal expansion of the index finger |
| Nerve Supply | Posterior interosseous nerve (C7, C8) |
| Blood Supply | Posterior interosseous artery |
| Actions | Extends the index MCP joint; Assists wrist extension |
|---|
EDC index slip lacerations in zone 5 require individual repair. In index MCP arthroplasty, the EDC index slip is centralised during soft tissue balancing.
Palpable as a cord on the dorsal hand during resisted index MCP extension.
Division in zone 5 producing MCP extension lag, repaired by modified Kessler suture with early protected mobilisation.
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