Hamstring strains usually occur with the knee fully straightened and the leg moving forward in a rapid motion (running/sprinting). The hamstrings are working hard to decelerate the lower leg as it swings out. The force generated during this activity is often too great for the muscle to overcome and a strain can occur. A strain can also occur during repetitive bending and lifting activities where the individual keeps his/her knees locked straight and bends from the waist.

 

A strain or pull is actually small tears in the muscle fibers. Symptoms include: Bruising, swelling, muscle spasm, difficulty contracting the muscle. A grade 1 strain is the least serious and grade 3 the most serious.

In the event of an acute strain rest, elevation, and compression are recommended. Gentle range of motion with no resistance should be started as soon as tolerated. Physical therapy should be initiated early to help control swelling and facilitate the healing process. Massage techniques as well as stretching and modalities will be used to help the damaged tissue heal. As healing progresses strengthening and endurance exercises will be added.