Chondromalacia, or runner's knee, is a condition where the articular cartilage, located underneath the kneecap (patella), starts to soften and break down. This cartilage is usually smooth and allows the knee joint to move freely as the knee bends. However, as chondromalacia worsens, the cartilage breaks down, causing irregularities and roughness on the under surface of the patella, which leads to irritation and pain underneath the patella, or kneecap.
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