Lateral epicondylitis — commonly called tennis elbow — is a degenerative tendinosis of the extensor carpi radialis brevis (ECRB) origin, not a true inflammation. This masterclass unpacks the pathogenesis, the Nirschl classification, the key clinical tests including Cozen and Maudsleyand the evidence-based management pathway from eccentric exercises through to surgical release. ⏱ Chapters 0:00 Intro 0:20 Essentials 0:57 Classification 1:29 Anatomy 2:01 Clinical Signs 2:42 Cozen Mnemonic 3:08 Management Mnemonic 3:39 Algorithm 4:20 Surgical Technique 4:54 Key Numbers 5:20 Clinical reasoning — 1 5:49 Clinical reasoning — 2 This comprehensive OrthoVellum masterclass covers lateral epicondylitis in depth, from the angiofibroblastic degeneration of the ECRB origin to conservative care, injection therapyand operative release. Learners gain a clear grasp of epidemiology (1–3% incidence, peak age 35–50), the common extensor origin anatomy, the COZEN and TENNIS mnemonics, the differential with radial tunnel syndromeand why platelet-rich plasma outperforms corticosteroid for durable outcomes. It is essential viewing for anyone managing elbow pain in clinic. 🦴 IN THIS VIDEO YOU'LL LEARN • Explain why lateral epicondylitis is a degenerative tendinosis rather than an inflammatory tendinitis • Identify the ECRB origin as the primary site of pathology and describe the biomechanics of overload • Apply the Nirschl classification to stage tendinosis severity and guide treatment decisions • Perform and interpret Cozen's test, Mill's testand Maudsley's test and differentiate tennis elbow from radial tunnel syndrome • Construct a structured conservative management plan using the TENNIS mnemonic and Tyler twist eccentric protocol • Compare the evidence for platelet-rich plasma versus corticosteroid injection in lateral epicondylitis • List the indications, techniquesand risks of surgical debridement of the ECRB origin • Recognise when imaging (USS or MRI) is appropriate and how to interpret ECRB tendon changes • Describe the risk factors, natural historyand occupational associations of tennis elbow ⏱️ CHAPTERS 📌 KEY TAKEAWAYS ✔️ Lateral epicondylitis is angiofibroblastic tendinosis of the ECRB, not inflammation — histology lacks prostaglandins ✔️ 80–90% of patients respond to conservative management; surgery is reserved for those failing 6–12 months ✔️ PRP is superior to corticosteroid for long-term relief; steroids only provide 4–8 weeks of benefit and increase recurrence ✔️ Maximum tenderness is 1 cm distal and anterior to the lateral epicondyle; PIN syndrome pain sits 4 cm distal ✔️ The underside of the ECRB origin is the Nirschl lesion — grey, friable, avascular degenerative tissue 👩⚕️ WHO THIS IS FOR This masterclass is designed for orthopaedic and sports medicine trainees, physiotherapists, general practitionersand allied health clinicians managing elbow pain, as well as informed patients seeking a deep understanding of their condition. 📚 RELATED TOPICS: Medial Epicondylitis (Golfer's Elbow) · Radial Tunnel Syndrome and PIN Entrapment · Common Extensor Origin Anatomy · Eccentric Exercise Protocols in Tendinopathy · Elbow Arthroscopy Portals and Indications · Corticosteroid Versus PRP Injections in Tendinopathy 🔗 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 #orthopedic #sportsmedicine #tenniselbow #lateralepicondylitis #ECRB #tendinosis #elbowpain #NirschlClassification #CozenTest #plateletrichplasma #elbowsurgery #medicaleducation #tendonpathology