A 22-year-old basketball player works part-time as a carpent…
A 22-year-old basketball player works part-time as a carpenter. He comes to the athletic training clinic reporting difficulty performing fine motor tasks such as picking up small screws and forming an “OK” sign. He denies numbness or tingling in the hand. The clinical exam reveals he cannot flex the distal interphalangeal (DIP) joint of the index finger or the interphalangeal (IP) joint of the thumb. Wrist flexion is present but appears slightly weak and deviates ulnarly. Which findings are MOST consistent with an anterior interosseous nerve (AIN) injury?