Articular cartilage damage can occur when either the cartilage on the ends of the long bones on the knee becomes damaged either through wear and tear or trauma. These injuries can vary in severity and depending on the degree of damage to the bone may require surgical intervention. One such opertaion is microfracture where the bone in the joint is scraped or damaged to promote bleeding into the damaged area eventually forming an internal scar which acts like the cartilage. Physiotherapy is required post operatively to reduce swelling, maintain range of motion, muscle strength and control.