Chondrosarcoma usually grows near knee and ankle joints, divided into single and multiple chondrosarcoma, the two types of harm are different, mostly seen in adolescents, chondrosarcoma will affect the growth and development of bones if it grows continuously. Multiple chondrosarcoma has less incidence, is prone to metastasis, and has a tendency to become cancerous. Single chondrosarcoma is less harmful and mostly benign. If it continues to grow, it may compress the nearby nerves, blood vessels and tendons, which may cause neuralgia and tenosynovitis. If the chondroma continues to grow, it may affect the growth and development of bones, resulting in bone deformity. Multiple chondromas are chondromas that appear in multiple locations, usually more than three. In addition to having the same dangers as single chondroma, multiple chondromas may metastasize and have a tendency to become cancerous. Chondromas should be diagnosed in a timely manner in a hospital, and a corresponding treatment plan should be adopted by a professional doctor.