What is a chondroblastoma?

Chondroblasts are specialized, cartilage-producing cells. Sometimes, these cells can grow out of control and cause a benign (non-cancerous) tumor known as a chondroblastoma. The cause of this tumor is unknown and is being researched. Chondroblastomas are usually found in the ends of long bones, such as the thigh bone (femur), upper arm bone (humerus) or shin bone (tibia). Sometimes they develop in the pelvis or hip socket. The vast majority of these tumors occur around the knee.

Although a chondroblastoma is considered a benign tumor, it has the potential to spread (metastasize) to the lungs. Metastasis is rare, occurring in less than 1 percent of cases. The tumor can cause pain, inflammation, joint stiffness, limping and other symptoms. It appears more often in boys than girls, usually during their teenage years.

Treatment is usually successful, and usually involves surgery. Kids typically feel better soon afterwards. Chondroblastoma can recur; the rate of recurrence is up to 20 percent.

How we care for chondroblastomas


  • experienced pediatric nurses
  • Child Life specialists, psychologists, social workers and resource specialists