An elderly patient presents with initial monoarthritis, particularly affecting the knee, worsened by daytime activity. X-ray shows osteophyte formation, marginal lipping, and joint space narrowing without ankylosis. The diagnosis is:
An elderly patient presents with initial monoarthritis, particularly affecting the knee, worsened by daytime activity. X-ray shows osteophyte formation, marginal lipping, and joint space narrowing without ankylosis. The diagnosis is: