Fortis Hospital: About 35 to 40 per cent of people in India suffer from knee pain. Knee pain can be caused by many factors, such as excessive friction in the knee joint, wrong sitting and standing posture, changing lifestyles, and obesity. Until now, knee replacement was the only option that existed when the pain increased. Where earlier the entire knee had to be replaced due to knee problems, now doctors in Sweden have succeeded in saving the knee by replacing only the part affected by friction.