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Health Information : Ligament Injuries to the Knee

What are knee ligaments?
There are four major ligaments in the knee. Ligaments are elastic bands of tissue that connect bones to each other and provide stability and strength to the joint. The four main ligaments in the knee connect the femur (thighbone) to the tibia (shin bone), and include the following:

•    anterior cruciate ligament (ACL) - the ligament, located in the center of the knee, that controls rotation and forward movement of the tibia (shin bone).
•    posterior cruciate ligament (PCL) - the ligament, located in the back of the knee, that controls backward movement of the tibia (shin bone).
•    medial collateral ligament (MCL) - the ligament that gives stability to the inner knee.
•    lateral collateral ligament (LCL) - the ligament that gives stability to the outer knee.

How is a knee ligament injury diagnosed?

In addition to a complete medical history and physical examination, diagnostic procedures for a knee ligament injury may include the following:
•    x-ray - a diagnostic test which uses invisible electromagnetic energy beams to produce images of internal tissues, bones, and organs onto film.
•    magnetic resonance imaging (MRI) - a diagnostic procedure that uses a combination of large magnets, radiofrequencies, and a computer to produce detailed images of organs and structures within the body; can often determine damage or disease in a surrounding ligament or muscle.
•    computed tomography scan (Also called a CT or CAT scan.) - a diagnostic imaging procedure that uses a combination of x-rays and computer technology to produce cross-sectional images (often called slices), both horizontally and vertically, of the body. A CT scan shows detailed images of any part of the body, including the bones, muscles, fat, and organs. CT scans are more detailed than general x-rays.
•    arthroscopy - a minimally-invasive diagnostic and treatment procedure used for conditions of a joint. This procedure uses a small, lighted, optic tube (arthroscope) which is inserted into the joint through a small incision in the joint. Images of the inside of the joint are projected onto a screen; used to evaluate any degenerative and/or arthritic changes in the joint; to detect bone diseases and tumors; to determine the cause of bone pain and inflammation.
•    radionuclide bone scan - a nuclear imaging technique that uses a very small amount of radioactive material, which is injected into the patient's bloodstream to be detected by a scanner. This test shows blood flow to the bone and cell activity within the bone.

Treatment for knee ligament injuries:

Specific treatment for a knee ligament injury will be determined by your physician based on:
•    your age, overall health, and medical history
•    extent of the injury
•    your tolerance for specific medications, procedures, and therapies
•    expectation for the course of the injury
•    your opinion or preference

Treatment may include:

•    medication such as ibuprofen
•    muscle-strengthening exercises
•    protective knee brace (for use during exercise)
•    ice pack application (to reduce swelling)
•    surgery