Total Knee Replacement
The knee is made up of – the femur (thigh bone), the tibia (shin bone), and patella (kneecap). The meniscus, a soft cartilage between the femur and tibia serves as a cushion and helps absorb shock during motion.
Total knee replacement (TKR) is a surgical procedure in which the worn out or damaged surfaces of the knee joint are removed and replaced with new artificial parts.
The goal of the surgery is to relieve pain and restore the alignment and function of your knee.
Surgery is performed under sterile conditions in the operating theatre under spinal or general anesthesia. You will be lying on your back and a tourniquet applied to your upper thigh to reduce blood loss.
The surgeon makes an incision along the affected knee exposing the knee joint.
The surgeon first concentrates on the femur (thighbone). The damaged portions of the femur are then cut at the appropriate angles using specialized jigs.
The femoral component is attached to the end of the femur with or without bone cement.
The damaged area of the tibia (shinbone) and the cartilage are cut or shaved. This removes the deformed part of the bone and bony growth, as well as allows for a smooth surface for which to attach the implants.
The tibial component is secured to the end of the bone with bone cement or screws depending on a number of factors and on surgeons’ choice.
The surgeon will place a plastic piece called an articular surface between the implants to assure a smooth gliding movement. This plastic insert will support the body’s weight and allow the femur to move over the tibia similar to the original cartilage (meniscus).
The femur and the tibia with the new components are put together to form the new knee joint.
To make sure the patella (knee cap) glides smoothly over the new artificial knee, its rear surface is prepared to receive a plastic component.
With all the new components the knee joint is tested through its range of motion.
All excess cement will be removed. The entire joint will be irrigated or cleaned with a sterile saline solution. The knee is then carefully closed and drains usually inserted and the knee dressed and bandaged.
You will be taken to the recovery room and monitored for any complications.
You will be given pain medication to keep you comfortable at home.
You will need someone to drive you home due to the drowsy effects of the anesthesia.
Swelling is normal after knee surgery. Ice, compression, and elevation of the knee will be used to minimize swelling and pain.
You will be given specific instructions regarding activity. Usually there are few activity restrictions.
You will be referred to a rehabilitation program for exercise and strengthening.
Eating a healthy diet and not smoking will promote healing.
As with any major surgery, possible risks and complications associated with total knee replacement surgery include:
Blood clots (deep vein thrombosis)
Nerve and blood vessel damage
Patella (kneecap) dislocation
Plastic liner wears out
Loosening of the implant