Final answer:
The priority problem for the nurse to address when planning care for a client with osteoarthritis is impaired physical mobility.
Step-by-step explanation:
When planning care for a client with osteoarthritis, the priority problem for the nurse to address would be impaired physical mobility. Osteoarthritis is a joint disease that leads to pain, stiffness, and decreased range of motion. Impaired physical mobility refers to the difficulty or inability to move the affected joints and can greatly impact a person's ability to perform daily activities. By addressing impaired physical mobility, the nurse can help the client maintain independence and quality of life.