system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
An 18-year-old man comes to the physician because of severe left shoulder pain after a basketball match. During the game, the patient sustained an injury to the posterior part of his outstretched arm after being blocked by a defender. Examination shows no gross deformity of the left shoulder. Palpation of the shoulder elicits mild tenderness. Internal rotation of the arm against resistance shows weakness. These findings are most specific for injury to which of the following muscles?
assistant
Subscapularis