What is chondroblastoma?

A chondroblastoma is a rare type of noncancerous bone tumor that begins in cartilage. This is the tough, rubbery connective tissue from which most bones develop. It plays an important role in the growth process. There are many different types of cartilage in the body. Chondroblastoma most often affects the ends of the long bones, near the growth plate, in the arms at the shoulder, and in the legs at the hip and knee. It is also called Codman’s tumor.

Chondroblastoma can affect people of all ages. But, it’s most common in children and young adults. It’s also more common in males than females.

What causes chondroblastoma?

The exact cause of chondroblastoma is not known. The tumors are believed to start from immature cartilage-making cells called chondroblasts.

What are the symptoms of chondroblastoma?

Symptoms of chondroblastoma may vary depending on the location of the tumor. The most common symptoms include:

• Pain in the knee, hip, and shoulder joint that may be slight or moderate and may be felt for months or years

• Withered or shrunken appearance of the muscle near the affected bone

• Joint stiffness

• Joint swelling

• A limp if the tumor is in the leg

The symptoms may look like other medical conditions or problems. Always talk with your healthcare provider for a diagnosis.

How is chondroblastoma diagnosed?

Your healthcare provider will ask about your health history and give you a physical exam. You may also have tests such as:

• X-rays. This is a test that uses a small amount of radiation to make images of tissues, bones, and organs on film.

• MRI. This is a test that uses large magnets, radio waves, and a computer to make detailed images of tissues in the body. This test can also rule out any problems of the spinal cord and nerves.

• CT scan. This is a test that uses a series of X-rays and a computer to make detailed images of the tissues in the body.

• Biopsy. A small sample of tissue is taken and tested. This is usually needed to confirm diagnosis.

How is chondroblastoma treated?

The goal for treatment of chondroblastoma is to remove the tumor and prevent damage to the end of the affected bone. Treatment may include:

• Surgery to remove the tumor

• Bone grafting, a surgery to transplant healthy bone from another part of the body to repair damaged bone

• Reconstruction or replacement of an affected joint

• Physical therapy to restore strength and function after surgery

Nonsurgical treatment choices may be used in some cases. This is due to the high risk of major complications from surgery. These other choices include:

• Cryotherapy. This is extreme cold treatment that is used to destroy the tumor.

• Radiofrequency ablation. This is a high frequency electrical current that is used to heat and destroy the tumor.

The tumor may recur. For this reason, follow-up with your healthcare provider is essential.

Key points about chondroblastoma

• Chondroblastoma is a rare type of noncancerous bone tumor that starts from cartilage.

• It most often affects the ends of the long bones, near the growth plate, in the arms at the shoulder, and in the legs at the hip and knee.

• It is more common in children and young adults and affects males more than females.

• The exact cause of chondroblastoma is not known.

• Symptoms may vary depending on the location of the tumor.

• The goal for treatment is to remove the tumor and prevent damage to the end of the affected bone.

Next steps

Tips to help you get the most from a visit to your healthcare provider:

• Know the reason for your visit and what you want to happen.

• Before your visit, write down questions you want answered.

• Bring someone with you to help you ask questions and remember what your provider tells you.

• At the visit, write down the name of a new diagnosis and any new medicines, treatments, or tests. Also write down any new instructions your provider gives you.

• Know why a new medicine or treatment is prescribed and how it will help you. Also know what the side effects are.

• Ask if your condition can be treated in other ways.

• Know why a test or procedure is recommended and what the results could mean.

• Know what to expect if you do not take the medicine or have the test or procedure.

• If you have a follow-up appointment, write down the date, time, and purpose for that visit.

• Know how you can contact your healthcare provider if you have questions, especially after office hours or on weekends and holidays.