Osteoarthritis of both knee
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Pain in the left knee for 5 months on examination: tenderness at the medial aspect of the knee no knee effusion no redness or hotness painful terminal range of motion
Bilateral osteoarthritis changes more clear on the left knee, seen as narrowed patellofemoral and medial tibiofemoral joint compartments, fine marginal osteophytes, and prominent tibial spines.
A sessile bony protrusion is seen in the distal posterior aspect of the left femur, consistent with exostosis.
Exostosis is a benign bony lesion mostly asymptomatic and is discovered by chance.