British Athletics Muscle Injury Classification: a new grading system
       
     
Normal presentation and diagnostic group 'a' injury
       
     
Diagnostic group 'b' and 'c' injuries
       
     
Transverse views
       
     
Hamstring Rehabilitation Guidelines
       
     
British Athletics Muscle Injury Classification: a new grading system
       
     
British Athletics Muscle Injury Classification: a new grading system

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.

Normal presentation and diagnostic group 'a' injury
       
     
Normal presentation and diagnostic group 'a' injury

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).

Diagnostic group 'b' and 'c' injuries
       
     
Diagnostic group 'b' and 'c' injuries

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.

Transverse views
       
     
Transverse views

These show myofascial 'a' and musculotendinous ‘b’ injuries.

Hamstring Rehabilitation Guidelines
       
     
Hamstring Rehabilitation Guidelines

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.