**Question:** In treatment of osteosarcoma, all of the following are used EXCEPT:

A. Chemotherapy
B. Radiation therapy
C. Surgery
D. Physical therapy

**Core Concept:** Osteosarcoma is a type of bone cancer that originates from bone-forming cells called osteoblasts. Treatment for osteosarcoma typically involves a combination of modalities targeting tumor control, limb preservation, and overall patient survival.

**Why the Correct Answer is Right:** Physical therapy is not typically used as a standalone modality in the treatment of osteosarcoma. While physical therapy can be beneficial in improving mobility, strength, and overall functional outcomes after surgeries or radiation therapy, its primary role is not directly related to tumor control or survival. Instead, chemotherapy, radiation therapy, and surgery are the mainstay modalities in osteosarcoma treatment.

**Why Each Wrong Option is Incorrect:**

A. Chemotherapy (Option A) is essential in osteosarcoma treatment, as it aims to eliminate cancerous cells and reduce the risk of tumor recurrence.

B. Radiation therapy (Option B) is also crucial in osteosarcoma treatment, as it can destroy cancer cells, shrink tumors, and reduce the risk of local recurrence.

C. Surgery (Option C) is the cornerstone of osteosarcoma treatment, as it involves removing the affected bone and surrounding tissues to prevent tumor spread, promote limb preservation, and improve survival rates.

**Clinical Pearl:** Combining chemotherapy, radiation therapy, and surgery is crucial for optimal treatment outcomes in osteosarcoma patients. A multidisciplinary approach involving oncologists, radiation oncologists, and orthopedic surgeons is essential to ensure effective treatment and optimal patient care.

**Correct Answer:** D. Physical therapy (Option D) is not specifically mentioned as a modality used in osteosarcoma treatment. While it may be beneficial in patients' overall rehabilitation and well-being, it is not essential for tumor control or survival in osteosarcoma patients.