Series of illustrations depicting the anatomical site of muscle injury and hence the letter classification produced for publication of the system by Noel Pollock, Steven L J James, Justin C Lee, Robin Chakraverty in the British Journal of Sports Medicine.
For grade 1–4 injuries, the suffix ‘a’ denotes a myofascial injury in the peripheral aspect of the muscle. A normal presentation is shown (left) with a diagnostic group ‘a’ injury (right).
A diagnostic group ‘b’ injury (left) within the muscle belly, most commonly at the muscle tendon junction (MTJ) and diagnostic group ‘c’ injury (right) which extends into the tendon.
These show myofascial 'a' and musculotendinous ‘b’ injuries.
Final transverse view, showing a tendinous ‘c’ injury (left). The final table (right) showing the classification in practice. Guidance is given for the rehabilitation of hamstring injuries for each of the three injury classifications.