Osgood-Schlatter disease occurs in boys and girls aged 9–16[2]
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 subacute 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 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 subacute 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.