Femoroacetabular impingement (FAI) is a major cause of anterior hip pain and early osteoarthritis in young, active patients. In this Orthovellum masterclass, we break down everything you need to know about CAM and pincer morphology, alpha angle measurementand clinical management. ⏱ Chapters 0:00 Intro 0:23 Essentials 1:03 Pathophysiology 1:39 Classification 2:17 Cam Mnemonic 2:41 Pincer Mnemonic 3:13 Clinical Signs 3:48 Fadir Mnemonic 4:18 Imaging 4:56 Algorithm 5:39 Scope Mnemonic 6:12 Numbers 6:48 Clinical reasoning — 1 7:30 Clinical reasoning — 2 This video provides a comprehensive, structured deep dive into the mechanical pathologies, morphological classificationsand surgical decision-making for femoroacetabular impingement. Viewers will understand the distinct outside-in and inside-out damage mechanisms of CAM and pincer lesions, learn how to confidently interpret diagnostic imaging like alpha angles and crossover signsand master the clinical bedside examination using the FADIR test. 🦴 IN THIS VIDEO YOU'LL LEARN • Define femoroacetabular impingement and its role in driving early hip osteoarthritis • Differentiate CAM morphology from pincer morphology based on mechanical pathophysiology • Identify the diagnostic threshold for an alpha angle greater than 55 degrees on lateral imaging • Recognise the radiographic signs of acetabular overcoverage, including the crossover sign and os acetabuli • Understand why 85% of symptomatic FAI cases present with a mixed morphology requiring combined surgical approaches • Perform the FADIR test accurately and understand its exceptional 94-99% clinical sensitivity • Explain the difference between outside-in anterosuperior cartilage delamination and inside-out posteroinferior contre-coup tears • Determine appropriate patient selection for hip arthroscopy versus conservative management ⏱️ CHAPTERS 📌 KEY TAKEAWAYS ✔️ Femoroacetabular impingement requires a triad for diagnosis: characteristic symptoms, clinical signsand confirming imaging. ✔️ CAM lesions drive outside-in shear forces causing anterosuperior labral damage, while pincer lesions cause inside-out posteroinferior contre-coup tears. ✔️ An alpha angle exceeding 55 degrees is the critical radiographic diagnostic threshold for CAM morphology. ✔️ The FADIR test (flexion, adduction, internal rotation) is the gold standard clinical provocative manoeuvre with 94-99% sensitivity. ✔️ Mixed morphology is the rule rather than the exception, occurring in 85% of symptomatic FAI cases. 👩⚕️ WHO THIS IS FOR This masterclass is an essential resource for orthopaedic trainees, medical studentsand practising clinicians seeking a structured understanding of hip pathology, as well as inquisitive patients wanting to deeply understand their FAI diagnosis and surgical options. 📚 RELATED TOPICS: Hip arthroscopy surgical techniques and indications · Acetabular labral tears and chondral damage repair · Developmental dysplasia of the hip (DDH) · Slipped capital femoral epiphysis (SCFE) and Perthes disease · Early onset hip osteoarthritis and joint preservation · The Warwick agreement on femoroacetabular impingement syndrome 🔗 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 #femoroacetabularimpingement #fai #hiparthroscopy #hipsurgery #orthopedicsurgery #sportsmedicine #camlesion #pincerimpingement #hippain #alphaangle #fadirstest #medicalstudent #orthoteaching