Slipped Capital Femoral Epiphysis (SCFE) explained clearly: anatomy, biomechanics, referred knee pain, radiographic diagnosis, Klein’s line / Trethowan sign, Loder stability, Southwick severity, complications, and safe in-situ fixation. This Orthovellum lecture is built for clinicians, medical students, orthopaedic trainees, and interested patients who want to understand why SCFE is easy to miss and why management decisions affect the femoral head blood supply. The core message: an adolescent with a limp or knee pain needs the hip examined and imaged. ⏱️ CHAPTERS: 0:00 s0 0:08 The Hip That Hides 0:22 The growth plate fails: the head stays in the socket, the neck slips o 0:45 The head sits on the physis — and its blood supply rides the posterosu 1:21 A vertical, weakened physis fails in shear — and the neck slips off th 1:58 A disease of the adolescent growth spurt 2:27 The atypical slip: think endocrine, and screen 3:01 One question predicts the outcome: can the child bear weight? 3:42 Grade the head–shaft angle — severity predicts impingement 4:14 Referred pain hides it; the Drehmann sign reveals it 4:53 s10 5:17 Klein’s line & the Trethowan sign 5:59 s12 6:25 Fix in situ — never force a reduction 7:31 s14 7:55 The complication that defines outcome 8:22 Know the complications — and the two cannot-miss traps 9:06 See the slip, pin the slip, save the hip 🦴 KEY TAKEAWAYS: • SCFE is a Salter–Harris type-I failure through the proximal femoral physis. • Pain is often referred to the thigh or knee; a normal knee does not exclude hip disease. • Klein’s line should clip the epiphysis; if it misses, think Trethowan sign. • Loder stability predicts avascular necrosis risk: stable slips are safer, unstable slips are emergencies. • Fix in situ with a central screw; do not force reduction of a chronic slip. • Counsel families about contralateral slip risk, especially in younger children or endocrine/renal causes. 🎨 Production: original OrthoVellum educational animation, radiographic teaching panels, and medical schematics. 🔗 More free orthopaedic teaching at Orthovellum.com — subscribe for weekly videos. ⚠️ Educational only — not individual medical advice. Always consult a qualified clinician for diagnosis and treatment. #orthopaedics #SCFE #paediatrics #medicaleducation #orthopaedicsurgery #hippain #Orthovellum