Osteosarcoma Masterclass: Staging, MAP Chemotherapy, Surgery & Prognosis

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Master osteosarcoma for your FRCS or FRACS orthopaedic exam. This comprehensive masterclass covers everything from the pathognomonic sunburst periosteal reaction and Codman triangle to MAP chemotherapy protocols, limb salvage surgery, and the crucial Enneking staging system. Learn how to confidently classify bone tumours and manage the most common primary malignant bone tumour in adolescents. ⏱ Chapters 0:00 Intro 0:03 Title 0:15 Essentials 0:48 Classification 1:18 Codman 1:35 Enneking 2:04 Algorithm 2:40 Map 2:58 Numbers 3:26 Viva Manage 4:03 Viva Pearls Osteosarcoma is a high-stakes topic in orthopaedic surgery and a favourite viva examiner target. This video provides an in-depth breakdown of the disease, moving systematically through epidemiology, the bimodal age distribution, and the classic radiographic signs. We explore the WHO classification system—including critical exam traps like parosteal osteosarcoma—and clearly explain why the Enneking (MSTS) surgical staging system dictates your operative approach. You will understand the complete 'sandwich' treatment paradigm of neoadjuvant MAP chemotherapy, wide surgical en bloc resection, and adjuvant chemotherapy, alongside the histologic response thresholds that ultimately decide patient prognosis. 🦴 IN THIS VIDEO YOU'LL LEARN: • How to identify the pathognomonic radiographic features of osteosarcoma, including the sunburst spiculated periosteal reaction and Codman triangle • The bimodal age distribution and the significance of distal femoral and proximal tibial metaphyseal locations • How to apply the Enneking (MSTS) GTM staging system and understand why most conventional tumours present as Stage IIB • The critical exam trap: why parosteal osteosarcoma is treated with wide resection alone and requires no chemotherapy • The components of the MAP chemotherapy regimen (Methotrexate, Adriamycin, cisPlatin) and their specific dose-limiting toxicities • The principles of planning a longitudinal biopsy and why the biopsy tract must be excised en bloc with the specimen • How modern neoadjuvant and adjuvant chemotherapy protocols have made limb salvage achievable in 80 to 90 percent of cases • The vital difference between telangiectatic osteosarcoma and an aneurysmal bone cyst on MRI • Why greater than ninety percent tumour necrosis is the single strongest histological prognostic factor ⏱️ CHAPTERS: 📌 KEY TAKEAWAYS: ✔️ Most conventional osteosarcomas present as Enneking Stage IIB (high grade, extracompartmental). ✔️ Parosteal osteosarcoma (posterior distal femur) is low-grade: treat with wide resection alone, no chemotherapy. ✔️ MAP chemotherapy: Methotrexate, Adriamycin (doxorubicin), and cisPlatin. ✔️ Surgery alone yields an eighty percent recurrence rate due to micrometastases; chemotherapy is mandatory. ✔️ Five-year survival is sixty to seventy percent for localised disease, dropping to twenty to thirty percent with metastases. ✔️ A good histologic response is defined as over ninety percent tumour necrosis following neoadjuvant chemotherapy. 👩‍⚕️ WHO THIS IS FOR: This masterclass is essential viewing for FRCS and FRACS orthopaedic exam candidates, orthopaedic surgery trainees, and medical students preparing for finals. Curious patients seeking a deep, medically accurate understanding of osteosarcoma will also benefit from this detailed overview. 📚 RELATED TOPICS: Enneking Staging System for Musculoskeletal Tumours · Ewing Sarcoma Differential Diagnosis · Limb Salvage Surgery in Primary Bone Tumours · Aneurysmal Bone Cyst (ABC) Pathology · Chemotherapy Protocols in Orthopaedic Oncology · Paget's Disease of Bone and Secondary Sarcoma 🔗 More free orthopaedic teaching at Orthovellum.com — subscribe for weekly videos. 🎨 CREDITS: • Original Orthovellum production. ⚠️ DISCLAIMER: Educational only — not individual medical advice. Always consult a qualified clinician for diagnosis and treatment. #osteosarcoma #orthopaedics #frcs #fracs #bonetumour #orthopaedicsurgery #medicaleducation #oncology #limbsalvage #ennekingstaging #codmantriangle #medschool #doctors #msts #orthopaedicexams