Which findings would indicate possible compromise of ulnar nerve integrity following surgical repair of a patient's elbow?

Question

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Inability to make the "OK" sign by bringing the thumb to the fourth or fifth finger indicates compromised ulnar nerve integrity as this nerve innervates the muscles responsible for this action. Edema in the forearm and slight flexion limitation do not specifically indicate compromise of the ulnar nerve, while pain radiating from the wrist to the middle finger could suggest compromise of the median or ulnar nerve.

Which Findings Would Indicate Possible Compromise of Ulnar Nerve Integrity