The ECRL transitions from muscle to tendon at the distal third of the forearm, with the musculotendinous junction at approximately the level of the distal third of the radius. This junction is the site of intersection syndrome where the ECRL and ECRB cross beneath the APL and EPB tendons.
The ECRL musculotendinous junction is the distal extent of the muscle belly and the proximal extent of the pure tendon accessible to tendon transfer surgery. Intersection syndrome occurs at this level where the thumb extensors cross over the radial wrist extensors, producing pain and crepitus 4-6 cm proximal to the wrist. Conservative management with splinting and injection is first-line.
Repetitive friction at the ECRL musculotendinous junction from thumb extensor crossover producing proximal wrist pain and crepitus in rowers and cyclists, managed with splinting and corticosteroid injection.
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