What is chondroblastoma?

Chondroblastoma is a rare, noncancerous bone tumor that starts in cartilage-forming tissue. It usually develops near the growth plates at the ends of bones.

This tumor is most often found in the shoulder, hip, or knee. Chondroblastoma mainly affects children, teenagers, and young adults while their bones are still growing.

Healthcare providers do not know the exact cause of chondroblastoma. It is believed to begin in immature cartilage-producing cells during bone growth.

Symptoms

Symptoms can vary depending on where the tumor develops. Pain near a joint is often the first sign.

Common symptoms may include:

• Ongoing joint or bone pain
• Swelling near the affected area
• Joint stiffness
• Trouble moving the joint normally
• Limping if the tumor affects the leg
• Muscle weakness or shrinking around the area

How is it diagnosed?

Diagnosis starts with a physical exam and a discussion about symptoms and medical history.

Imaging tests such as X-rays, MRI scans, and CT scans help providers see the size and location of the tumor. A biopsy is usually needed to confirm the diagnosis and rule out other bone conditions.

How is it treated?

Surgery is the most common treatment for chondroblastoma. The goal is to remove the tumor while protecting the nearby bone and joint.

Some patients may also need:

• Bone grafting to repair damaged bone
• Physical therapy to rebuild strength and movement
• Cryotherapy or radiofrequency ablation in certain cases

Because the tumor can sometimes return, regular follow-up visits and imaging tests are important after treatment.