Table 2: Classification of Proximal Hamstring Injuries.
| Level of Injury | |
| Type 1 | Osseous avulsions (generally seen in pediatric patients) |
| Type 2 | Avulsions at the muscular-tendinous junction |
| Type 3 | Incomplete tendon avulsions |
| Type 4 | Complete avulsions with no/minimal retraction |
| Type 5a | Complete avulsions with retraction but NO sciatic nerve involvement |
| Type 5b | Complete avulsions with retraction AND sciatic nerve involvement |