The EIP provides independent index finger extension (allowing the index finger to point while the other fingers are fisted) and is the most commonly transferred tendon in reconstructive hand surgery. It is used for EPL reconstruction after attrition rupture, APB reconstruction in CTS, and as a donor for multiple reconstruction procedures. Its loss produces minimal functional deficit as the EDC index maintains extension.
Independent index finger extension; the most commonly transferred extensor tendon donor
EIP transfer to EPL restores thumb IP extension after EPL attrition rupture at Lister tubercle — the most common indication. The transfer is performed by dividing the EIP at the index MCP level, routing it through a subcutaneous tunnel to the EPL stump at the thumb, and setting the tension with the thumb extended and the wrist in neutral.
Transfer of the EIP tendon to reconstruct the ruptured EPL at Lister tubercle restoring thumb IP extension.
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