Tearing occurs in muscle belly or tendon.
- 1o: discomfort
- 2o: some tearing
- 3o: complete rupture
Graphic provided with permission from
Athletic Injury Assessment by Booher and Thibodeau, 1994
This indicates a muscle strain to the quadriceps. A muscle that is more commonly strained is the hamstring. This occurs if the quadriceps are considerably stronger and overpower the hamstring during sprinting or other high intensity activities.