Piriformis syndrome is a disorder which occurs when the sciatic nerve is compressed and irritated by the piriformis muscle as it passes close to or through the piriformis muscle. To understand the relationship between the sciatic nerve and the piriformis muscle a basic knowledge of anatomy is helpful. 

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Hamstring injuries are common among high speed and kicking activities such as runners, footballers and martial arts.

The hamstring muscles run down the back of the leg from the pelvis to the back of your knee. An injury can range from minor strains to total rupture of the muscle. The four muscles that make up the hamstrings are the semitendinosus and semimembranosus (medially) and the biceps femoris - long and short head (laterally).

A sudden, sharp pain in the back of the thigh that may stop you mid-stride characterizes a hamstring injury. After such an injury, the knee may not extend more than 30 to 40 degrees short of straight without intense pain. 

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