Final answer:
The greatest anticipated range of motion restriction in a patient with a capsular limitation at the proximal radioulnar joint occurs during pronation and supination of the forearm.
Step-by-step explanation:
The greatest anticipated range of motion restriction in a patient with a capsular limitation at the proximal radioulnar joint occurs during pronation and supination of the forearm. This is because the proximal radioulnar joint is responsible for the rotation of the radius. With a capsular limitation, the ligament that holds the head of the radius in place is restricted, resulting in limited rotational motion.