Symptoms of an isolated injury to the knee cartilage will primarily be pain under load. Sometimes, it will be especially painful when loading with the knee in certain positions, depending on where the damage has occurred. There may also be swelling associated with activity. Eventually one can have an sensation of rubbing or bumping on the knee when one bends and stretches the knee.

If there is a \”mouse in the knee\”, the latter may sometimes be trapped and cause pain, or a direct sensation of a locking knee. Locking of the knee may be difficult to distinguish from those interlocks that may come by meniscal injuries. One can also have a sense that \”something clicked\” in the knee, and there may be a slight swelling of the knee.

If the piece is damaged in your knee, or if the \”mouse\” consists only of cartilage, it may be difficult or impossible to see on a plain radiograph , whereas a loose piece of bone or other bone injury will be visible on a radiograph. An MRI could reveal an injury to the cartilage. This can be used both to diagnose and help with planning surgery for possible cartilage damage. Injury can also be discerned by means of arthroscopy. Whether a patient should choose to do an MRI or go directly to a laparoscopy is dependent on the symptoms and what the doctor finds in the general survey.

If cartilage damage is superficial, treatment consists mostly in that it relieves the knee in a period, perhaps this could mean that the patient does not have to support the leg during a few weeks. If a larger piece of cartilage or bone is damaged, and the piece is large enough, there can result relatively fresh injuries from trying to put the piece in firmly. There are different methods.

If someone has persistent symptoms of a major cartilage damage, there are three ways to operate. All methods have a somewhat unpredictable and uncertain outcome. They cannot guarantee freedom from symptoms. Whether a patient chooses one or the other operation method, is among other things dependent on the nature of the injury. One method is minimally invasive surgery on the cartilage in the damaged area and doing some fine drill holes in the bone underneath. This is suitable to promote healing in the area. Healing does not happen as with normal cartilage, but with a sort of scar tissue. This is the simplest method.

Another technique consists of transplanting small cylinders of cartilage and bone from a load point of the knee to the damaged area. This can be called a \”mosaic transplantation\” and is a more extensive surgery. A third approach is an arthroscopic surgery that can take a bit of cartilage from the knee. These cartilage cells are grown in order to receive increased amounts of cartilage cells. After about two weeks the orthopedist implants a piece of bone lining over the cartilage damage. The cultured cartilage cells are then placed under the membrane and so must be the new cartilage in the area. This treatment is not offered at all sites. Mice in the knee are usually handled by minimally invasive surgery that removes the loose piece of cartilage or bone.

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