The biceps femoris is a two headed muscle located on the back of thigh. It consists of two parts: the long head as the attachment from the ischium and the short head attached to the femur bone. The long head is a part of hamstring muscle group which occupy posterior section of the thigh. The hamstring muscles may be considered as extensors of the thigh. The long head part has origin on posterior of the tuberosity of the ischium and sacrotuberous ligament while the short one arises from the lateral lip of the linea aspera. Biceps femoris muscle is important for knee flexion, internal and external rotation, and hip extension. A pain in biceps femoris can be caused by several reasons. The most common thing is a strained muscle caused by improper lifting or too much exercise. Over usage of biceps femoris can torn muscles and ligaments. However, there is always a possibility of underlying cause of pain. For persistent pain in biceps femoris it is recommended to consult a doctor and get some medical advice.
Written and medically reviewed by the Healthline Editorial Team
In Depth: Biceps femoris