Orthopaedics A patient can’t extend his wrist after he has met with an accident. He has no sensory loss. Level at which the affected nerve is injured? A Spiral groove of humerus B Head of radius C Near medial epicondyle D Surgical neck of humerus 💡 Explanation A patient can't extend his wrist after he has met with an accident. He has no sensory loss. Level at which the affected nerve is injured? ✓ Correct Answer: A. Spiral groove of humerus