Isolated extensor carpi radialis brevis (ECRB) tendon rup- ture from the third metacarpal bone is a rare injury [3]. Because this injury is an avulsion injury, a fracture at the base of the third metacarpal always accompanies it. So far, nine cases of isolated ECRB tendon avulsion rupture have been reported in the medical literature. All of these cases reported that the injuries were closed injuries; therefore, there are no reports of open isolated ECRB tendon rupture in the medical literature [1, 3, 5, 8–13]. In this case report, an open isolated ECRB tendon avulsion rupture with third metacarpal base fracture after a spring injury is presented.
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