Compact plugs of balanced cartilage from non-weightbearing regions of a joint, including the aspect on the knee, are taken off and utilised to replace compact areas of damaged knee articular cartilage. The kneecap, or patella, is usually coated with sleek cartilage, permitting it to glide easily all through joint motion. https://www.theorthopaedicandpainpractice.com/chondromalacia/