What Is Knee Replacement?Friday, February 10, 2023 - 13:58
Guy Slowik FRCS
David S Hungerford MD FRCS
Total knee replacement (TKR), also referred to as total knee arthroplasty (TKA), is a surgical procedure where worn, diseased, or damaged surfaces of a knee joint are removed and replaced with artificial surfaces. Materials used for resurfacing of the joint are not only strong and durable but also optimal for joint function as they produce as little friction as possible.
The "artificial joint or prosthesis" generally has two components, one made of metal which is usually cobalt -chrome or titanium. The other component is a plastic material called polyethylene.
The procedure has been proven to help individuals return back to moderately challenging activities such as golf, bicycling, and swimming. Total knees are not designed for jogging, or sports like tennis and skiing (although there certainly are people with total knee replacements that participate in such sports).
The general goal of total knee replacement is designed to provide painless and unlimited standing, sitting, walking, and other normal activities of daily living
Nice To Know:
With proper care individuals who have had a total knee replacement can expect many years of faithful function. Studies show that patients can expect a greater than 95 percent chance of success for at least 15 years.
If You Are Considering Total Knee Replacement Surgery
If you have been told you have a severely damaged knee joint and would benefit from a total knee replacement, the questions you need to ask yourself are:
If the answesr to these questions are yes, you may be a candidate for a new knee.
The Anatomy Of The Knee Joint
The knee joint performs similar to a hinge joint. It consists of three bones:
- Thigh bone (Femur)
- Leg bone (Tibia)
- Knee cap (Patella)
- The junction where the femur and tibia couple together is called the femorotibial joint.
- The region of the knee where the patella and femur form a junction is called the patellofemoral joint.
- These two joints are what allow the bending and straightening of the knee. It is these joints that are replaced in a total knee joint replacement.
For a knee to function normally, the quality of smoothness where each bone moves upon the other becomes important in the function of the knee joint.
The surfaces of all three bones coming into contact with each other are normally covered with a smooth gliding surface known as
The condition of this cartilage lining the knee joint is a key aspect of normal knee function and is important to the physician when evaluating a potential need for a knee joint replacement.
In addition to the smooth cartilage lining on the joint surfaces, there are two smooth discs of cartilage that cushion the space between the bone ends. The inner disc is called the medial
Generally speaking, there are four major ligaments that play an important part in stability of the knee joint. One on each side of the knee (but actually outside the joint) known as collateral ligaments and two more centrally located ligaments within the joint known as anterior and posterior cruciate ligaments.
Facts About Total Knee Replacement