No signs of fractures. Diffuse low attenuation of the bones. There is a well-defined fat attenuated lesion within the upper pole of the patella, showing sclerotic margins, no cortical breach and no periosteal reaction, consistent with a nonaggressive lesion - this may be an intraosseous lipoma, which can be painful.
Further characterisation with MRI may be considered.
Medial compartment joint space narrowing.There is a mild joint effusion.