Final answer:
The primary indication for a uni knee replacement is indeed isolated osteoarthritis of a single compartment of the knee, either medial or lateral.
Step-by-step explanation:
The statement that the primary indication for a uni knee is isolated osteoarthritis of a single compartment (medial or lateral) is true. Uni knee replacement, also known as unicompartmental knee arthroplasty, is typically indicated for patients who have osteoarthritis that is limited to one compartment of the knee, either the medial or lateral compartment. In contrast to total knee replacement which involves the entire knee joint, the uni knee procedure targets only the affected compartment, preserving as much of the natural knee structure as possible.