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.
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 one-incision procedure. The EI is expendable because the EDC index tendon maintains index MCP extension. The EI is identified by confirming independent index extension with other fingers flexed before division.
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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