The extensor indicis proprius runs in the fourth extensor compartment alongside the extensor digitorum communis tendons, inserting independently onto the index finger extensor expansion. At the wrist it lies ulnar to the EDC tendon to the index finger, providing independent index finger extension.
The EIP tendon at the wrist level is the most commonly harvested tendon for transfer in hand surgery — used for EPL reconstruction after Lister's tubercle rupture and for independent index finger extension restoration. It is identified at the wrist by its ulnar position to EDC and confirmed by active independent index finger extension with other fingers flexed. EIP harvest at the wrist leaves a small functional deficit in independent index extension.
Standard reconstruction for EPL rupture at Lister's tubercle using EIP transfer at the wrist level, restoring thumb IP extension with low donor site morbidity.
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