Articular cartilage is a firm, rubbery tissue that covers the ends of bones to provide a smooth gliding surface for joints which act as a cushion between bones. Cartilage can break down due to overuse or injury that can lead to pain, swelling, and problems with your joint.
A knee cartilage transplant – autograft – is performed on people who have a specific cartilage defect typically due to an injury; it is not done when cartilage loss is much more extensive.
This video will give you a general overview of the procedure. Your own surgery may vary depending on the scope of the damage and the judgement of your surgeon.