This paper explores a different grading system for hamstring injuries. It is different from the 'old' 1,2,3 ie mild, moderate, severe tears system and considers length of tear, cross-sectional area of oedema, muscle fibre disruption and the structure torn eg fascia, muscle or tendon which all have rehab and return to play implications.
For example a 1a hamstring could be sprinting in a week, a 3c may take 8-12 weeks and a 4 may require surgery. Accurate diagnosis is key to effective rehab and accordingly accurate prognosis. Happy education 😃.