Protruding bones below the knee may be a problem in the following areas. 1. Depending on the age of the patient, if it is a child or adolescent with protruding bones below the knee, care must be taken to rule out bone tumors. 2. If the protruding bones below the knee are elderly, they are usually degenerative in nature, that is, osteoarthritis, bone growth, enlargement, thickening and protrusion. 3. Tumors around the knee joint should also be ruled out, such as 4. Soft tissue tumors, such as muscle tumors, popliteal cysts, and soft tissue tumors around the knee joint, both benign and malignant, may be involved. In addition, there may be tibial nodal hyperplasia and abnormal tibial nodal development, which can also manifest as a protruding bone below the knee.