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 Froment signs are positive in injury of which nerve and explain in detail?
Froment's sign is clinical testing of adductor pollicis .Give the patient a thin book and ask him to grasp it firmly between thumb and index fingers of both hands. If the muscle is healthy and acting normally, the thumb will be straight. but if paralyzed,the thumbs are flexed at IP joints. This is because adductor pollicis is not acting and flexor pollicis compensates for it. Reference: Textbook of anatomy upper limb and thorax, Visharm Singh, 2nd edition, page no.144.