Key factors triggering referral for imaging
| Factors | No of responses | % of total |
| Loss of range of motion/ strength/ tension or integrity on examination | 14 | 16 |
| Symptom levels | 12 | 14 |
| Injury mechanism or sound (pop) | 8 | 9 |
| Failure to improve | 7 | 8 |
| Severity | 6 | 7 |
| Diagnosis | 6 | 7 |
| Prognosis Questions (need for surgery) | 4 | 5 |
| Suspected tissue type | 5 | 6 |
| Particular muscle | 3 | 3 |
| Athlete level | 3 | 3 |
| Player or coach expectation | 3 | 3 |
| Bleeding bruising | 5 | 6 |
| Availability of imaging modalities | 2 | 2 |
| Timing | 3 | 3 |
| Local protocol | 1 | 1 |
| Cost | 1 | 1 |
| Red flag | 1 | 1 |
| Scientific evidence | 1 | 1 |
| Athlete susceptibility (including previous HSI) | 1 | 1 |
| Total | 86 | 100 |
HSI, hamstring injuries.