The orthopedic knee specialist will create a cut over the front of your knee to reveal the injured joint.The normal cut size ranges from about 610 inches in length.Following the surgery, the surgeon positions your kneecap to the side and removes the damaged or worn-out cartilage and a small portion of the bone.Surgeons then repair the injured tissue with new plastic and metal parts.The components are joined together to form an artificial joint that is medically suitable and replicates the movement of your knee joint.Usually, knee replacement surgeries take between 60 and 90 minutes to complete.