Knee Bone Tumor

A knee bone tumor is a mass of tissue caused by cells that multiply uncontrollably. A tumor may be benign (noncancerous) or malignant (cancerous). Most bone tumors are benign, according to the American Academy of Orthopaedic Surgeons.

Types

• Noncancerous knee bone tumors include non-ossifying fibromaunicameral bone cysts, osteochondromas, giant cell tumors, enchondromas and fibrous dysplasia. Cancerous bone tumors that commonly affect the knee are osteosarcomas and those caused by multiple myeloma or Ewing's sarcoma.

Significance

• The significance of a knee bone tumor depends on the type of tumor. Benign tumors are not life threatening, but they sometimes cause pain or discomfort. Cancerous tumors can also cause pain, and they can spread to other parts of the body and become life threatening.

Identification

• A doctor may perform a physical examination, X-ray, blood test and urine test if a knee tumor is suspected. A biopsy may also be performed to allow the tissue to be examined.

Treatment

• Benign tumors may not require treatment, but they may be surgically removed if there is a risk of bone fracture or disability. Malignant tumors may be treated with a combination of surgery and radiation or chemotherapy.

Warning

• See a doctor if you experience pain or notice a mass on your knee. Malignant tumors that are diagnosed early have a better chance of being cured.