The extensor indicis proprius tendon runs ulnar to the EDC index finger tendon in the fourth compartment, providing independent index extension that allows the index to extend while the other fingers are flexed. Its independence from the juncturae tendinum makes it the most reliable donor tendon for EI-to-EPL transfer in EPL attrition rupture at Lister tubercle, a simple effective procedure that restores thumb IP extension.
| Muscle |
|
|---|---|
| Attachment | Passes through the fourth extensor compartment, ulnar to the EDC index tendon, to the index extensor expansion |
Independent index finger extension; donor tendon for transfers
EI tendon transfer to the EPL is performed for EPL attrition rupture after distal radius fractures, restoring thumb IP extension through a simple procedure. The EI is divided at the index MCP level, routed subcutaneously to the thumb, and woven into the EPL with the tension set with the thumb extended. It is expendable because the EDC index tendon maintains index extension, and it is identified as the more ulnar of the two index extensor tendons by confirming independent index extension with the other fingers flexed. It is also used as the motor for opposition transfer (EIP opponensplasty) in median nerve palsy.
Extensor indicis tendon transferred to restore EPL function after attrition rupture at Lister tubercle, providing thumb IP extension restoration through a reliable donor tendon.
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