Knees

The knee is the largest joint in the body. The knee joint is made up of the femur, tibia and patella (knee cap). All these bones are lined with articular (surface cartilage). This articular cartilage acts like a shock absorber and allows a smooth low friction surface for the knee to move on. Between the tibia and femur lie two floating cartilages called menisci. The medial (inner) meniscus and the Lateral (outer) meniscus rest on the tibial surface cartilage and are mobile. The menisci also act as shock absorbers and stabilizers.

The knee is stabilized by ligaments that are both in and outside the joint.
The medial and lateral collateral ligaments support the knee from excessive side-to-side movement. The (internal) anterior and posterior cruciate ligaments support the knee from buckling and giving way. The knee joint is surrounded by a capsule (envelope) that produces a small amount of synovial (lubrication) fluid to help with smooth motion. Thigh muscles are important secondary knee stabilizers.

Click on the topics below to go the desired section

Knee anatomy :: Knee arthritis
Knee Arthroscopy :: Total Knee Replacement :: ACL Reconstruction
Unicondylar Knee Replacement (UKR) :: Revision Knee Replacement

 Normal anatomy of the Knee Joint

How does the Knee joint work?

Find out more in this web based movie.

Arthritis of the Knee joint

The term arthritis literally means inflammation of a joint, but is generally used to describe any condition in which there is damage to the cartilage.

Click here to go to the section on arthritis.

Arthroscopy of the knee joint.

Arthroscopy is a surgical procedure in which an arthroscope is inserted into a joint. Arthroscopy is a term that comes from two Greek words, arthro-, meaning joint, and -skopein, meaning to examine.

The benefits of arthroscopy involve smaller incisions, faster healing, a more rapid recovery, and less scarring. Arthroscopic surgical procedures are often performed on an outpatient basis and the patient is able to return home on the same day.

Find out more about Knee Arthroscopy from the following links.

Interactive Movie	Text version	Patient Info handout

Total Knee Replacement (TKR).

A total knee replacement (TKR) or total knee arthroplasty is a surgery that resurfaces an arthritic knee joint with an artificial metal or plastic replacement parts called the ‘prostheses'.

Find out more about Total Knee Replacement with the following links.

Interactive Movie	Text version	Patient Info handout

Anterior Cruciate Ligament ACL reconstruction

The anterior cruciate ligament is one of the major stabilizing ligaments in the knee. It is a strong rope like structure located in the centre of the knee running from the femur to the tibia. When this ligament tears unfortunately it doesn't heal and often leads to the feeling of instability in the knee.

ACL reconstruction is a commonly performed surgical procedure and with recent advances in arthroscopic surgery can now be performed with minimal incisions and low complication rates.

ACL Reconstruction Hamstring tendon.

Interactive Movie	Text version	Patient Info handout

ACL Reconstruction Patellar tendon

Interactive Movie	Text version	Patient Info handout

Unicondylar (Unicompartmental) Knee Replacement.

This simply means that only a part of the knee joint is replaced through a smaller incision than would normally be used for a total knee replacement. The knee joint is made up of 3 compartments, the patellofemoral and medial and lateral compartments between the femur and tibia (i.e. the long bones of the leg). Often only one of these compartments wears out, usually the medial one. If you have symptoms and X-ray findings suggestive of this then you may be suitable for this procedure.

Find out more about Unicondylar Knee Replacement with the following links.

Interactive Movie	Text version	Patient Info handout

Revision Knee Replacement.

This means that part or all of your previous knee replacement needs to be revised. This operation varies from very minor adjustments to massive operations replacing significant amounts of bone and hence is difficult to describe in full.

Find out more about Revision Knee Replacement with the following links.

Interactive movie	Text version	Patient Info Handout