- Discussion:
- along w/
EDC forms tunnel IV;
- Anatomy:
- origin: dorsal surface of distal half of ulna;
- insertion: index finger and EDC tendon at MCP level;
- action: extension of all phalanges of index finger;
- nerve: deep radial,
C6,
C7,
C8;
- synergists:
extensor digitorum;
- Exam: evaluated by having the patient make a fist, then extend index finger;
- Tendon Transfer:
- extensor indicis sometimes transferred surgically to replace torn
EPL tendon;
- when performing
tendon transfers the following are important:
- by sectioning
EIP proximal to sagittal hood, one can perform tendon transfer, & also maintain independent extension of index finger;
-
hazards:
- beaware that in some situations
(RA) the EDC to the index finger may have ruptured, and in this case, extensor indicis transfer is contra-indicated;
- there are usually very few problems w/ extensor tendon lag if one does not tether or tighten the saggital fibers of the index finger;
Independent index extension after extensor indicis proprius transfer. J. Moore et al. J. Hand Surg. Vol 12-A. p 232. 1987.
Prevention of extensor lag after indicis proprius tendon transfer. EZ Browne. J. Hand Surg. Vol 4. p 168. 1979.
Extensor indicis proprius opponensplasty. Burkhalter, W. E., Christensen, R. C., and Brown, P.: J. Bone Joint Surg. 55A:725, 1973.
Independent index extension after indicis proprius transfer: excision of juncturae tendinum.
