Orthopedic oncology is a subspecialty of orthopedic surgery focused on treating tumors and cancerous growths in bones and soft tissues. These specialists handle everything from primary bone cancers and soft tissue sarcomas to cancer that has spread to the skeleton from elsewhere in the body. The field combines cancer treatment with complex skeletal reconstruction, since removing a tumor from bone or muscle often means rebuilding what’s left behind.
What Orthopedic Oncologists Treat
The scope of this specialty is broader than most people expect. Orthopedic oncologists treat primary bone cancers (tumors that originate in bone), soft tissue sarcomas (cancers arising in muscle, fat, nerves, or connective tissue), and tumor-like conditions that aren’t cancerous but still require surgical management. They also treat metastatic bone disease, which occurs when cancers from other parts of the body spread to the skeleton. Because removing these tumors often leaves major gaps in bone or soft tissue, orthopedic oncologists are also trained in complex skeletal reconstruction, a skill set that sometimes brings them into trauma and joint replacement cases involving significant bone loss.
Primary Bone Cancers
The three most common primary bone cancers are osteosarcoma, chondrosarcoma, and Ewing sarcoma. Which type is most likely depends heavily on age. In children and adolescents, osteosarcoma accounts for about 56% of primary bone cancers, with Ewing sarcoma making up 34%. In adults, the picture flips: chondrosarcoma is the most common at roughly 40%, followed by osteosarcoma at 28%.
Osteosarcoma typically develops near the ends of long bones, especially around the knee, upper arm, and upper thigh. Ewing sarcoma can appear in bone or soft tissue and tends to affect younger patients. The first symptom of a bone tumor is usually a deep, dull ache that gets worse over time and doesn’t respond well to standard pain relievers. Pain that worsens at night is a significant warning sign. Some patients first notice a palpable lump with tenderness, and in some cases, a fracture through weakened bone is what leads to the diagnosis.
Metastatic Bone Disease
A large portion of orthopedic oncology practice involves cancer that started somewhere else and traveled to bone. This is far more common than primary bone cancer. Prostate cancer has the highest five-year rate of bone spread at 52%, followed by breast cancer at 41%, head and neck cancers at 36%, and lung cancer at 33%. Even melanoma and pancreatic cancer spread to bone in roughly one out of four patients over five years.
When cancer weakens a bone enough to risk fracture, or causes pain that limits daily function, an orthopedic oncologist steps in to stabilize or reconstruct the affected area. The goal in metastatic disease is typically to maintain mobility and quality of life rather than to cure the cancer itself.
How Diagnosis Works
Getting the diagnosis right is critical, and it starts with imaging followed by a biopsy. Two main biopsy approaches exist: a needle biopsy, where a hollow needle extracts a small core of tissue, and an open biopsy, where a surgeon cuts into the area to remove a larger sample. For bone tumors, needle biopsies perform remarkably well, achieving diagnostic accuracy of 100% in one study compared to about 93% for open biopsy. For soft tissue tumors, open biopsy tends to be slightly more accurate (100% vs. about 85%), though the differences aren’t statistically significant.
Where and how the biopsy is performed matters enormously. An improperly placed biopsy can contaminate surrounding tissue and complicate future surgery. This is one of the key reasons that suspected bone or soft tissue tumors should be evaluated at a specialized center. An experienced orthopedic oncologist plans the biopsy with the eventual surgery in mind, placing the needle or incision along a path that can be cleanly removed later if the tumor turns out to be malignant.
Treatment and Limb Salvage Surgery
Treatment for bone and soft tissue cancers typically involves surgery to remove the tumor, often combined with chemotherapy, radiation, or both. The surgical cornerstone is achieving “wide resection,” meaning the tumor is removed with a margin of healthy tissue around it to reduce the chance of recurrence.
Decades ago, amputation was the standard approach for most bone cancers. Today, limb salvage surgery has largely replaced it. In a study of 61 patients with osteosarcoma, those who underwent limb salvage had significantly better functional scores and quality of life ratings than those who had amputations, with quality of life scores averaging 78 out of 100 compared to 65 for amputation. Local recurrence rates were low in both groups, confirming that saving the limb doesn’t mean compromising cancer control.
After the tumor is removed, the surgeon must rebuild the skeletal structure. Several options exist depending on the size and location of the defect. Modular endoprostheses are metal implants that can be assembled in different configurations to replace missing sections of bone and joint. Allograft-prosthetic composites combine donor bone with a metal implant. Both approaches produce similar functional results, though donor bone grafts carry somewhat higher rates of infection and problems with the graft healing to surrounding bone. For certain cases, 3D-printed custom implants are emerging as another reconstruction option.
The Multidisciplinary Team
Orthopedic oncologists don’t work in isolation. Each patient’s treatment plan is typically developed through a multidisciplinary tumor board that includes medical oncologists (who manage chemotherapy), radiation oncologists, musculoskeletal radiologists who interpret imaging, and pathologists who analyze tissue samples. This team approach is especially important in pediatric cases, where treatment must account for a child’s remaining growth potential. A tumor near a growth plate in a 10-year-old presents very different surgical challenges than the same tumor in a 50-year-old, and the reconstruction strategy needs to accommodate years of future growth.
Training and Specialization
Becoming an orthopedic oncologist requires extensive training. After medical school, a surgeon completes a five-year orthopedic surgery residency, then pursues a dedicated 12-month fellowship in musculoskeletal oncology accredited by the Accreditation Council for Graduate Medical Education. During the fellowship, trainees are evaluated against specific competency milestones, and they must demonstrate the ability to practice independently before completing the program. Board certification through the American Board of Orthopaedic Surgery follows. This level of specialization means there are relatively few orthopedic oncologists compared to general orthopedic surgeons, and they tend to practice at academic medical centers or large cancer hospitals.