Osteochondroma of both knees First of all, it is recommended to check the X-ray of both upper limbs to see if osteochondroma is also present. This is because osteochondromatosis is a generalized disease. It has been painful for two years, and it is best to remove it surgically. If it is a wide basal type, it should be operated even more to prevent malignant change. The surgery is simple, but the tumor should be removed thoroughly, including: 1. the periosteum on the surface of the tumor. 2, cartilage cap. 3. the bony part of the tumor together with some normal bone around its base. Training can usually be resumed after the surgical incision heals. Because the surgery does not destroy the bone of the joint, joint capsule and joint ligaments, it does not affect the movement.