You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Which muscle is tested in Froment's sign? and explain in detail?
FROMENT SIGN: With weakness of the ulnar nerve innervated adductor pollicis muscle, a positive Froment sign may be observed. As the patient tries to hold a piece of paper placed between the thumb and the index finger, the thumb interphalangeal joint flexes in an attempt to substitute flexor pollicis longus activity for inadequate adductor pollicis strength. Ref: Bednar M.S., Light T.R. (2006). Chapter 10. Hand Surgery. In H.B. Skinner (Ed), CURRENT Diagnosis & Treatment in Ohopedics, 4e.