This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Orthopaedics
[{'content': 'All of the following are affected in low radial nerve palsy except - \nSelect and explain. \nA. Extensor carpi radialis longus, B. Extensor carpi radialis brevis, C. Finger extensors, D. Sensation on dorsum of hand', 'role': 'user'}, {'content': 'Answer: A \nExplanation: In type II low radial nerve palsy ECRL, triceps, Anconeus, and brachioradialis are spared.\n\nClinical features of radial nerve palsy\n\n\nClinical features depend upon the site of the lesion.\n\n1) 1f lesion is high\n\nWrist drop, thumb drop and finger drop.\nInability to extend elbow, wrist, thumb & fingers (MP joint)\nThe patient can extend interphalangeal joints due to the action of lubricants and interossei.\nSensory loss over posterior surface of arm & forearm and lower lateral half of forearm.\n\n2) If the lesion is low\na) Type I\n\n\nWrist drop, thumb drop and finger drop.\nElbow extension is preserved.\nSensory loss over the dorsum of first web space.\n\nb)\xa0Type II\n\nThumb drop and finger drop\nElbow and wrist extension is preserved\nSensory loss over the dorsum of first web space\n\nClinical features of posterior interosseous nerve\n\nIt is\xa0prone to be injured in injury & operations of radial head- neck .\nThere is\xa0no sensory deficit as\xa0it is a pure motor nerve.\nWrist extension is preserved (i.e. no wrist drop) due to spared extensor carpi radialis longus .\nPresents with\xa0loss of extension of metacarpophalangeal (MP) joints i.e., thumb & finger drop.', 'role': 'assistant'}]