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 Hyperextension at the metacarpophalangeal joints and flexion at the interphalangeal joints is caused by injury in the and explain in detail?
i.e. (Ulnar nerve): (59, 134-BDC-l 5th)An ulnar nerve lesion at the writ produces ulnar claw hand'CLAW HAND - due to the un opposed action of the long flexors and extension of the fingers, there is hyperextension at the metacarpo phalangeal joint and flexion at the interphalangeal joints involving the ring and little fingers - more than the index and middle fingers* If both median and ulnar nerves are paralysed the result is complete claw hand* Ulnar injury at the wrist can be tested by froment's sign