hamstrings

Hamstring and Thigh Rehabilitation: 50 Evidence-Based Biomechanics Analyses is an open educational collection from the MMSx Authority Applied Biomechanics Lab (MMSx Authority Institute for Movement Mechanics & Biomechanics Research, Inc.). It contains 50 articles covering hamstring strain, quadriceps and groin injury, return to sprinting and thigh load. Each article pairs a biomechanical analysis of three movements (four 1080 × 1350 analysis slides) with verified research data, a three-step decision pathway (modify, load, track), cautions on when to seek assessment, and APA 7 references with DOIs. Biomechanics is treated as a mechanical decision science: force, direction, dose and tissue tolerance. Files: the full collection as one PDF; all 200 slides with the DOI on each slide; the website edition (HTML articles). Online edition: https://mmsxauthority.org/edu/analysis/hamstring-thigh/ The figures are educational estimates made from illustrated reference figures; they are not measurements of a patient and are not a diagnosis or a substitute for individual clinical assessment. Articles01. Hamstring strain: why it is the most common injury in running sports02. Hamstring pain when sprinting: what happens in the late swing phase03. Pulled hamstring: grade 1, 2 or 3, and what each means for recovery04. Hamstring tear: when a tendon injury needs a surgical opinion05. Proximal hamstring tendinopathy: pain at the sitting bone06. Pain when sitting: when the hamstring tendon is the source07. Hamstring re-injury: why it comes back and how to lower the risk08. Nordic hamstring curl: what the injury-prevention evidence shows09. Eccentric hamstring strength: why lengthening control matters10. Tight hamstrings: stiffness, protective tension or nerve sensitivity?11. Hamstring stretching: does it prevent injury or just change tolerance?12. Return to running after a hamstring strain: criteria, not calendar days13. Hamstring injury in footballers: high-speed running and fatigue14. Hip extension versus knee flexion exercises: training both hamstring roles15. Romanian deadlift for hamstrings: loading the hip hinge safely16. Hamstring pain behind the knee: tendon, nerve or knee joint?17. Sciatic nerve sensitivity: when "tight hamstrings" is a nerve sign18. Slump and straight-leg raise tests: what they tell you about the nerve19. Hamstring cramps: fatigue, hydration and what the evidence supports20. Hamstring muscle bruise versus strain: telling them apart21. Quadriceps strain: the kicking and sprinting injury22. Rectus femoris injury: why the two-joint quadriceps is vulnerable23. Thigh bruise (dead leg): recovery and when it can calcify24. Myositis ossificans: when a thigh bruise turns to bone25. Quadriceps weakness after knee injury: why it lingers26. Quadriceps tendinopathy: pain above the kneecap27. Front-of-thigh pain when squatting: load, depth and knee position28. Groin strain: adductor injury in change-of-direction sports29. Adductor longus pain: the most commonly injured groin muscle30. Copenhagen adduction exercise: preventing groin injury31. Inner thigh pain: muscle, tendon, hip joint or hernia?32. IT band pain: why stretching the band rarely fixes it33. Outer thigh pain: gluteal tendon, IT band or referred pain?34. Meralgia paraesthetica: burning outer-thigh pain from a nerve35. Thigh muscle imbalance: what the hamstring-to-quadriceps ratio means36. Hamstring-to-quadriceps ratio and ACL risk: what is proven37. Single-leg strength differences: when thigh asymmetry matters38. Thigh muscle loss with age: sarcopenia, strength and falls39. Thigh pain in runners: stress reaction, strain or overload?40. Femoral stress fracture: deep thigh pain that should not be ignored41. Thigh pain after a long run: soreness or injury?42. DOMS in the thighs: why eccentric work hurts days later43. Sprinting technique and hamstring load: posture, stride and pelvis44. Pelvic tilt and hamstring strain: does the pelvis matter?45. Glute weakness and hamstring overload: the shared hip-extension job46. Hamstring injuries in older athletes: masters sport and tendon health47. Thigh compartment syndrome: severe swelling after impact or exertion48. Deep vein thrombosis: calf or thigh pain that is not a muscle injury49. Thigh red flags: when thigh pain needs urgent medical care50. Returning to sport after a thigh injury: strength, speed and confidence tests

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This systematic review and meta-analysis will quantify the effects of eccentric hamstring training on biceps femoris long-head (BFlh) fascicle length and pennation angle, compare knee-dominant (Nordic hamstring exercise) and hip-dominant eccentric exercises, and examine whether ultrasound fascicle-length assessment method moderates the effect.

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