A hamstring strain or a pulled hamstring as it is sometimes called is a tear in one or more of the hamstring muscles. Strictly speaking there are three hamstring muscles (Semitendinosus, Semimembranosus and Biceps femoris) which are known as the hamstring muscle group.
Many people suffer with tight hamstrings. Most of the time they will not cause a problem but can be more prone to bad tears, may contribute towards injuries such as lower back pain.
Quadriceps muscle strain The quadriceps muscles are the muscles on the front of the thigh. They consist of the Vastus lateralis, Vastus medialis, Vastus intermedius and the Rectus femoris. A strain is a tear in the muscle. These can range in severity, from a very small tear to a complete rupture.
Myositis Ossification If you have a bad muscle strain or contusion (dead leg!) and it is neglected then you could be unlucky enough to get Myositis Ossificans. It is usually as a result of impact which causes damage to the sheath that surrounds a bone (periostium) as well as to the muscle. Bone will grow within the muscle (called calcification) which is painful. The bone will grow 2 to 4 weeks after the injury and be mature bone within 3 to 6 months.
Rectus femoris strain The rectus femoris muscle is one of quadriceps muscles. It goes from the hip to the knee and can be used to straighten the knee or lift the knee up. This muscle can rupture or become inflamed at the upper part. The main cause of this is overuse through kicking or explosive movements as in sprint starts.
Groin strain is a tear or rupture to any one of the adductor muscles. There are 5 adductor muscles: the pectineus, adductor brevis, and adductor longus (called short adductors which go from the pelvis to the thigh bone) and the gracilis and adductor magnus (long adductors which go from the pelvis to the knee).
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