Smaller plugs of nutritious cartilage from non-weightbearing areas of a joint, including the side of the knee, are taken out and used to exchange little parts of damaged knee articular cartilage. It is commonly caused by overuse or misalignment of the knee joint. Knee Bursitis - Knee bursitis is inflammation https://www.theorthopaedicandpainpractice.com/chondromalacia/