This essentially means a softening of the cartilage of the
knee cap. The anatomical sources of
pain in this area is now considered to be
from the richly innervated subchondral bone (bone below the articular cartilage), infrapatellar fat pad, or the medial and lateral retinaculum of the joint.
“...certain mechanical conditions may predispose you to a mistracking knee cap. ”
Cartilage does not have the same blood supply that bone does.