Hamstring injuries are common problems that may result in significant loss of on-field time for many athletes because these injuries tend to heal slowly. Once injury occurs, the patient is at high risk for recurrence without proper rest and rehabilitation.
The hamstring muscles are 3 muscles in the posterior thigh: the semitendinosus, semimembranosus, and biceps femoris. The semitendinosus originates at the ischial tuberosity and inserts at the pes anserine; the semimembranosus originates at the ischial tuberosity and inserts at the posterior medial tibia. The biceps femoris has a long head that originates at the ischial tuberosity and a short head at the posterolateral femur and inserts into the head of the fibula. These muscles serve as knee flexors and hip extensors. See the image below.
At heel strike of the gait cycle, the hamstrings actually contribute to knee extension through closed chain kinetics. During the gait cycle, the biceps femoris contracts eccentrically in terminal swing, which is important in the pathology of the injury, as discussed later. [1, 2, 3]
Hamstring strain is a fairly common injury in physically active individuals.
No mortality is associated with hamstring strain; however, morbidity is common, due to pain and reinjury if proper rehabilitation does not occur before the patient returns to preinjury activity levels. [4, 5]
While hamstring injuries can occur in people of any age, incidence increases with age.
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