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Osgood- Schlatter

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Osgood- Schlatter
Osgood–Schlatter disease or syndrome (also known as tibial tubercle apophyseal traction injury) is an irritation of the patellar ligament at the tibial tuberosity. Sinding–Larsen–Johansson syndrome is an analogous condition involving the patellar tendon and the lower margin of the patella bone, instead of the upper margin of the tibia.
The condition occurs in active boys and girls aged 9–16 coinciding with periods of growth spurts. It occurs more frequently in boys than in girls, with reports of a male-to-female ratio ranging from 3:1 to as high as 7:1. It has been suggested the difference is related to a greater participation by boys in sports and risk activities than by girls.
The condition is usually self-limiting and is caused by stress on the patellar tendon that attaches the quadriceps muscle at the front of the thigh to the tibial tuberosity. Following an adolescent growth spurt, repeated stress from contraction of the quadriceps is transmitted through the patellar tendon to the immature tibial tuberosity. This can cause multiple sub-acute avulsion fractures along with inflammation of the tendon, leading to excess bone growth in the tuberosity and producing a visible lump which can be very painful when hit. In more detail, activities such as kneeling may irritate the tendon. The syndrome may develop without trauma or other apparent cause; however, some studies report up to 50% of patients relates a history of precipitating trauma.
In a retrospective study of adolescents, young athletes actively participating in sports showed a frequency of 21% reporting the syndrome compared with only 4.5% of age-matched nonathletic controls. Intense knee pain is usually the presenting symptom that occurs during activities such as running, jumping, squatting, and especially ascending or descending stairs and during kneeling. The pain is worse with acute knee impact. The pain can be reproduced by extending the knee against resistance, stressing the quadriceps, or striking

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