6,12,13Īlthough the mechanism of injury and underlying pathology of hamstring injuries is well described, treatment options vary widely without an agreed-upon gold standard, and are affected by age, activity level, and the possible need for rapid return to play. Taking into account all locations of hamstring injuries, the biceps femoris was most commonly injured, accounting for about 80% of the cases. Fewer than 1% of the patients had injuries of the distal tendons. 6-11 Approximately 12% of the patients in the study suffered proximal injuries, either avulsion of the ischial tuberosity or a partial tear proximally. 1 Koulouris and Connell reviewed 179 acute hamstring injuries in athletes and found that nearly 90% of tears occur at the myotendinous junction, a finding that has been supported throughout the literature. However, the myotendinous junction of the hamstring muscles, unlike other muscles, spans most of the muscle belly due to long proximal and distal tendons as described by Woodley and Mercer. The majority of acute injuries occur at the myotendinous junction, an area prone to muscular strains. There are a wide variety of injuries to the hamstring muscle-tendon complex. The leukocyte-poor layer lies just above the white blood cell (WBC) layer and is considered pure PRP, without WBC. The PRP preparation rich in growth factors (PRGF) technique. The long and short heads of the biceps muscles merge and insert into the proximal fibula and proximal lateral tibia. The semitendinosus inserts onto the anterior proximal medial tibia at the pes anserine. The semimembranosus inserts onto the posterior surface of the medial tibial condyle. Each inserts just distal to the knee joint. The short head of the biceps femoris originates from the linea aspera on the posterior femur. The semimembranosus, semitendinosus, and the long head of the biceps femoris originate from the ischial tuberosity. The hamstring muscle group extends the leg at the hip and flexes the leg at the knee it consists of three muscles contained within the posterior compartment of the thigh. Hamstring injuries, acute and chronic, are common in long distance runners, sprinters, and jumpers. As an adjuvant to physical therapy, PRP may help delay or obviate surgery for partial hamstring tears.īy Frank B. Preliminary research suggests platelet-rich plasma (PRP) is a safe and effective means of treating hamstring injuries that do not respond to early conservative measures.
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