The content covered by bone oncology should include both orthopedic science and oncology. Therefore, the understanding and diagnosis of the disease should be based on both oncology and orthopedic science, i.e., the growth mode of the tumor, the aggressiveness of the tumor, the extent of tumor involvement, and the degree of impact on the function of the locomotor system. Similarly, the treatment of malignant bone tumors should also meet the requirements of both oncology and orthopedics, i.e. complete resection of the tumor (removal of tumor in the cytological sense) and reconstruction of the functional damage of the locomotor system caused by the resection of the tumor (reconstruction of bone and soft tissue). The most common mistake made by general orthopaedic surgeons is to overemphasize the preservation and reconstruction of limb function at the expense of tumor treatment, i.e., preserving the tissue anatomy required to maintain good function at the expense of the surgical boundaries of tumor treatment. For malignant bone tumors, especially lesions located in the limbs, the biological behavior of the tumor is the main factor affecting the survival of the limb and life, while the superiority of the function of the locomotor system affects the quality of patient survival. The consequences of local recurrence of malignant bone tumors are not only to affect the limb function, increase the risk of re-amputation and aggravate the pain and medical cost of patients, but also to make the rate of pulmonary metastasis in patients with recurrence much higher than those without recurrence, and the majority of patients whose lives end in malignant bone tumors are due to the development of pulmonary metastasis. The only way to talk about quality is to be able to survive. Life no longer exists, and even perfect function is just empty talk.