The ischial tuberosity is the location of origin of the hamstring.
The ischial tuberosity is the location of origin of the hamstring. The most medial tendon origin is the conjoined tendon, which includes the semitendinosus and biceps femoris tendon origin. More lateral on the ischial tuberosity is the semimembranosus.
Hamstring origin on the ischial tuberosity An avulsion injury at the level of the ischial tuberosity apophysis occurs at the secondary apophysis. A secondary ossification center is present between the ages of four and seventeen. The ischial apophysis may not close until 25 years old, but they are most commonly seen between ages 15 and 19 (1,8).
An avulsion of the ischial tuberosity is the most common pelvic and hip avulsion. Injuries to the ischial apophysis typically occur during athletic activity during a sudden eccentric contraction. The most common activities are sprints, kicks, and jumps.
The contraction of muscle will lead to the separation of the epiphyseal plate. The patient will commonly complain of an acute pop or tear in the buttock area. Patients will complain of pain with use and it may improve with rest.
However, patients with an ischial apophysis avulsion may complain with sitting on a hard surface. Examination will begin with evaluation of the affected area. Physicians should evaluate the buttocks and posterior thigh for ecchymosis.
If you are experiencing symptoms that may be related to ischial apophysis avulsion fracture, it is important to see a sports medicine physician. Early evaluation and treatment typically lead to better outcomes. Do not ignore pain or symptoms that are limiting your activity.
*This article is for educational purposes only and does not substitute for professional medical advice. Always consult a qualified healthcare provider.*
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