If tendon retraction is significant, one option is lengthening the flexor pollicis longus (FPL), performed at the musculotendonous junction so that the lengthening site is proximal to the carpal ...

The most frequently injected upper-limb muscles were flexor carpi radialis (64.0% of patients), flexor carpi ulnaris (59.1%), flexor digitorum superficialis (57.2%), flexor digitorum profundus (52 ...