Osteoid osteoma is a classic benign bone-forming tumour that every orthopaedic clinician must confidently recognise. In this in-depth masterclass, we explore its unique pathophysiology, classic nocturnal pain patternand modern minimally invasive management. ⏱ Chapters 0:00 Intro 0:24 Essentials 1:05 Classification 1:37 Nidus 2:02 Vs Osteoblastoma 2:38 Imaging 3:17 Sclerosis Mnemonic 3:47 Management 4:17 Rfa Numbers 4:44 Prognosis 5:17 Clinical reasoning — Classic 5:50 Clinical reasoning — Atypical This video provides a comprehensive breakdown of osteoid osteoma, a benign osteoblastic tumour defined by a central nidus under two centimetres. We cover everything from anatomical classification and the prostaglandin-mediated pain pathway to the CT-guided imaging hallmarks and radiofrequency ablation techniques that define modern orthopaedic practice. 🦴 IN THIS VIDEO YOU'LL LEARN • The pathophysiology of nocturnal pain and why NSAIDs provide rapid relief • The strict two-centimetre size threshold that differentiates osteoid osteoma from osteoblastoma • Anatomical classifications including cortical, cancellous, subperiostealand intra-articular lesions • Why CT is the gold standard imaging modality for identifying the lucent nidus • How MRI findings can be misleadingly aggressive due to extensive surrounding oedema • The classic double-density sign seen on bone scans • First-line radiofrequency ablation techniques and achieving successful day-case treatment • Specific clinical scenarios where surgical excision is mandated over thermal ablation ⏱️ CHAPTERS 📌 KEY TAKEAWAYS ✔️ Nidus size is the sole differentiator between osteoid osteoma and osteoblastoma, as their histology is identical. ✔️ Classic presentation is night pain in young males that is dramatically relieved by NSAIDs within twenty to thirty minutes. ✔️ CT is the undisputed gold standard for visualising the nidus and planning intervention. ✔️ CT-guided radiofrequency ablation is the first-line treatment, achieving over ninety percent success rates. ✔️ Never use ablation near an open physis due to the severe risk of growth plate injury. 👩⚕️ WHO THIS IS FOR This masterclass is essential for orthopaedic trainees, medical studentsand clinicians seeking a deep understanding of benign bone tumours. Curious patients looking to understand the diagnosis and treatment of their condition will also find this overview highly informative. 📚 RELATED TOPICS: Osteoblastoma diagnosis and management · Benign bone tumours of the appendicular skeleton · CT-guided radiofrequency ablation in orthopaedics · Intra-articular hip synovitis differential diagnosis · Painful scoliosis in adolescents 🔗 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. #orthopaedics #osteoidosteoma #bonetumour #orthopaedicsurgery #medicaleducation #radiofrequencyablation #rheumatology #radiology #bonedisease #orthosurgery #medstudent #doctor #surgeon #tumour