Hamstring injuries strike the biceps femoris long head at the exact moment it works hardest – during terminal swing when the muscle lengthens under an eccentric load up to two and a half times body weight. This biomechanical peak explains why eighty per cent of tears occur here, setting the stage for a high reinjury risk if rehabilitation is inadequate. ⏱ Chapters 0:00 Intro 0:32 Why The Hamstring Tears 1:38 High-Grade Biceps Femoris — Oedema Around A… 2:59 Grading What You See 3:41 The Published Bamic Key — The Suffix… 5:01 The Reinjury Problem 5:54 Criterion-Based Continuum — Five Phases To… 7:23 The Displaced Avulsion 8:22 Chronic Avulsion — Heterotopic Ossification… 9:05 The Rehabilitation Ladder 10:33 Recap & sources This video explores the anatomy, mechanism, and classification of hamstring injuries, highlighting why the biceps femoris long head is most vulnerable, how sprint‑type and stretch‑type mechanisms differ, and what MRI features indicate a central‑tendon lesion. It explains the British Athletics Muscle Injury Classification (BAMIC), outlines surgical indications for proximal avulsion, and details evidence‑based prevention and return‑to‑sport criteria that reduce reinjury risk. 🦴 IN THIS VIDEO YOU'LL LEARN • Identify why the biceps femoris long head is the most frequently injured hamstring muscle. • Explain the biomechanics of terminal swing and eccentric loading that precipitate tears. • Differentiate sprint‑type from stretch‑type hamstring injuries based on mechanism and prognosis. • Apply the British Athletics Muscle Injury Classification (BAMIC) and interpret the A, B, C suffixes. • Read MRI findings to assess tear location, central tendon involvement, and retraction distance. • Recognise clinical indicators for surgical repair of proximal hamstring avulsion (e.g., over 2 cm retraction). • Outline evidence‑based prevention strategies, including Nordic hamstring exercises and H:Q ratio targets. • Define return‑to‑sport criteria that minimise reinjury risk, such as Askling H‑test negativity and functional strength benchmarks. 📌 KEY TAKEAWAYS ✔️ Eighty per cent of hamstring tears involve the biceps femoris long head at its proximal musculotendinous junction. ✔️ The BAMIC ‘C’ suffix (intratendinous injury) predicts longer recovery and higher reinjury than peripheral strains of the same grade. ✔️ Sprint‑type injuries heal faster than stretch‑type lesions, even when the latter appear milder initially. ✔️ Proximal avulsion requires surgical repair when retraction exceeds 2 cm or more than two tendons are avulsed. ✔️ Reinjury rates climb to ~34 % if athletes return before meeting functional criteria such as an H:Q ratio over 0.8. ✔️ Nordic hamstring exercises reduce injury incidence by approximately 70 % when incorporated into training programmes. 👩⚕️ WHO THIS IS FOR This video is designed for orthopaedic trainees, medical students, sports clinicians, and any healthcare professional seeking a clear, evidence‑based update on hamstring muscle injuries. Interested patients and athletes will also find the explanation of mechanism, prognosis and return‑to‑sport guidance valuable. 📚 RELATED TOPICS: Proximal hamstring avulsion repair · Nordic hamstring exercise programme · Askling H‑test assessment · Hamstring‑to‑quadriceps strength ratio · BAMIC muscle injury classification · Stretch‑type versus sprint‑type hamstring injury 🔗 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 #sportsmedicine #hamstringinjury #bicepsfemoris #terminalswing #eccentricload #MRIgrading #reinjuryprvention #nordicexercises #asklingtest #proximalavulsion #hamstringrehab #HQRratio #sprinttype #stretchtype