Anatomic relationship of extensor indicis propius and extensor digitorum communis: Implications for tendon transfer

Figure 1 Tendon circumference measurement. Tendon circumference was measured utilizing 4-0 prolene at distal extensor retinaculum and at the metacarpophalangeal joint for both the extensor indicis proprius and extensor digitorum communis to the index tendons. Prolene was used to obtain accurate circumference measurements. The distal extensor retinaculum was marked prior to measurements to ensure repeatability and consistent measurement to the myotendinous junction.

Figure 2 Interesting case of a split extensor indicis proprius tendon that joined the extensor digitorum communis to the index tendon. A specimen in which the EIP consisted of two slips, one of which arose from the extensor indicis proprius and joined the extensor digitorum communis to the index just proximal to the metacarpophalangeal joint.