The Sprinter With "Tight Hamstrings" and a Normal Breakout
A 24-year-old 100 m sprinter is 9 weeks post grade II right hamstring strain, cleared by the team physician for progressive running but not yet for maximal sprinting. He reports constant "tightness" in the right posterior thigh and stretches 20 minutes daily with no change. Multi-segmental flexion is DN: fingertips reach mid-shin and he reports strong posterior thigh tension. Yet supine passive hip flexion with the knee extended reaches 90 degrees on the right, thoracic flexion is FN, and the limitation reduces markedly when he is cued to exhale and move slowly. Single leg stance right is DN with loss of hip extension and a hip drop; left is FN. Overhead deep squat FN. Cervical and upper extremity patterns FN. His coach has messaged asking you to "just give him a proper hamstring stretching programme" and wants him sprinting flat out in 2 weeks.
1. Reconcile a DN multi-segmental flexion with normal passive hip flexion and thoracic breakouts. What is this, in SFMA terms?
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The logic of the model: the top tier tells you a pattern is limited; the breakouts tell you where. When the relevant breakouts are FN, the limitation is not explained by tissue restriction at those segments - it is a problem in how the pattern is produced.
Applied here: passive hip flexion with the knee extended reaches 90 degrees, so posterior chain extensibility is adequate. Thoracic flexion is FN. Yet active multi-segmental flexion stops at mid-shin with strong tension. Range that disappears under passive conditions and returns when the task is performed actively is a control and tolerance issue, not a short hamstring. The change with exhaling and slow tempo strengthens that reading.
"Tightness" is a sensation, not a measurement. The patient's word and your measurement have to be kept separate; nine weeks of daily stretching with no change is itself evidence against the tissue-extensibility explanation.
What remains on the list: the right single leg stance DN with loss of hip extension - a genuine dysfunction and the more likely driver of his sprinting risk.
2. How do you answer the coach, and what do you actually do in the session?
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To the coach: "He has already stretched 20 minutes daily for nine weeks and nothing changed, and his passive range is normal. More stretching is unlikely to be the missing piece. We are training the pattern under control and loading the hamstring, and I will tell you when he is ready for full speed." Give a reason, not a refusal - the coach needs to trust the plan enough not to work around it.
On the 2-week demand: a grade II strain at nine weeks with a control deficit does not get a flat-out deadline. State the criteria he must meet and let the criteria, not the calendar, set the date. Put that in writing.
In the session: retrain multi-segmental flexion slowly with an exhale and segmental control, then re-test it immediately; then load the pattern with eccentric hamstring work and submaximal running drills with cueing. Do not stretch. Re-test, do not assume.
3. What are your return-to-sprint criteria, and how do you use the top tier as an outcome measure rather than a treatment?
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Criteria: multi-segmental flexion converts to FN with the tension sensation gone, or at least no longer the limiting factor; right single leg stance converts to FN with hip extension and no hip drop; pain-free progressive running at high intensity with no next-day exacerbation; and side-to-side strength symmetry acceptable to the medical team. Note that the SFMA score alone is not a return-to-sport test - it does not measure tissue healing or load tolerance, and passing it does not license maximal sprinting.
Using the top tier properly: score multi-segmental flexion and right single leg stance at the start and end of each session. Improvement within the session confirms you have found the driver; no change tells you to look elsewhere. The screen is a measurement instrument, not an exercise.
Document the baseline, the within-session re-tests, the criteria given to the coach, and the explicit recommendation against the 2-week maximal-speed deadline. That note protects the athlete and makes your reasoning visible at the next review.