Final answer:
The nurse should collaborate with a Physical Therapist to resolve discrepancies in patient care involving muscle or joint injuries, due to their specialized knowledge in body mechanics.
Step-by-step explanation:
The best member of the interdisciplinary team for a nurse to collaborate with to resolve a discrepancy in a patient's care, particularly if the issue concerns a muscle or joint injury, would be a Physical Therapist (PT). PTs have either a master's degree or a doctorate, and they offer a high level of expertise in the mechanics of body movements. Because they are well-versed in dealing with sports injuries and other musculoskeletal issues, they are equipped to provide specialized care that focuses on rehabilitation and physical functionality.