Minimally Invasive Knee Replacement
Minimally invasive surgery for knee replacement involves use of smaller incisions which are only 4 to 6 inches in length as compared to the 10-12 inch long incision used in the traditional procedure.
Surgery is performed under sterile conditions in the operating theatre under spinal or general anesthesia.
You will be lying down on your back on the operating table and a tourniquet is applied to your upper thigh to reduce blood loss. Then your surgeon makes an incision along the affected knee to expose the knee joint.
The surgeon first focuses on the femur (thighbone). The damaged portions of the femur are cut at the appropriate angles using specialized jigs. Then the femoral component is attached to the end of the femur with or without bone cement.
The next step involves removal of the damaged area of the tibia (shinbone) and the cartilage. It allows for a smooth surface to which implants can be attached. The tibial component is then secured to the end of the bone using bone cement or screws.
Your surgeon will place a plastic piece called an articular surface between these implants to ensure a smooth gliding movement. This plastic insert acts in a similar way as the original articular cartilage and helps in supporting your body weight as well as allows the femur bone to move over the tibia.
The femur and the tibia bone with their new components are put together to form the new knee joint.
To ensure that the patella (knee cap) glides smoothly over the new artificial knee, its rear surface is prepared to receive a plastic component.
With all its new components in place, the knee joint is examined through its range of motion.
All excess cement will be removed and the entire joint will be irrigated or cleaned out with a sterile saline solution. The incision is then carefully closed and drains are usually inserted. Then a surgical dressing or bandage is placed.