You have asked a patient to make a fist, and although he can complete the task, he cannot flex the distal phalanx of the ring finger. This clinical finding can best be explained by:
- A ruptured extensor digitorum communis tendon
- A ruptured flexor digitorum profundus tendon
- A ruptured flexor carpi radialis tendon
- A ruptured flexor digitorum superficialis tendon
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