Conclusion the patellofemoral pain is related with the sclerosis of subchondral bony plate of patella and the localized synovitis at the margin of patellofemoral joint.

Its feature symptom is limitations of joint cartilage degeneration and new bones forming among joint edge and subchondral osteophyte.

This creates a chisel-like effect referred to as “edge-loading” that produces large volumes of microscopic metallic particles that can cause havoc in some patients.