The EIP tendon runs alongside the EDC in the fourth compartment and inserts ulnar to the EDC index tendon on the index extensor expansion, providing independent index finger extension for pointing. As the most commonly transferred tendon in reconstructive hand surgery, it restores EPL after attrition rupture at Lister tubercle. Its harvest is confirmed by identifying the more ulnar of the two dorsal index MCP tendons.
Independent index finger extension — allows pointing while other fingers are fisted
EIP transfer to EPL for Lister tubercle EPL attrition rupture after distal radius fracture is the standard reconstruction — the EIP is divided at the index MCP level, routed subcutaneously to the EPL stump at the thumb, and set with the thumb extended. The index finger retains extension via the EDC. Post-transfer thumb extension is immediate with early active therapy.
EIP tendon rerouted to restore thumb IP extension after EPL attrition rupture at Lister tubercle — most common upper limb tendon transfer.
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