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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Unfortunately when you have enough stress placed through your body to fracture a bone there's usually a lot of other soft tissues and structures that have been damaged in the process. Add to that the common use of immobilisation in plaster, you'll have post-immobilisation stiffness and considerable weakness. 

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