A positive Froment's Sign suggests paralysis of which nerve?

A positive Froment's Sign indicates paralysis of the ulnar nerve. This test is typically performed by having a patient hold a piece of paper between their fingers while the examiner attempts to pull it away. If the patient flexes their thumb to compensate for the inability to oppose their fingers (often the index finger), it suggests weakness or paralysis of the muscles supplied by the ulnar nerve, particularly the adductor pollicis muscle.

In healthy individuals, the ulnar nerve provides the function necessary for holding the paper steady without the thumb compensating. The sign is often used in conjunction with other clinical assessments to confirm ulnar nerve palsy, frequently seen in conditions such as cubital tunnel syndrome. Understanding the implications of a positive Froment's Sign is crucial for assessing potential nerve injuries and aiding in diagnosis and treatment planning.