Abstract
Jumper’s knee, Osgood-Schlatter disease, and Sinding-Larsen-Johansson syndrome are the most frequent overuse syndromes of the knee. The diseases depend mainly on training frequency and level of performance, but many factors, both intrinsic and extrinsic, contribute to the pathogenesis: weight, body mass index, waist-to-hip ratio, arch height of the foot, quadriceps flexibility and strength, hamstring flexibility, and vertical jump performance, as well as different intrinsic factors (ligamentous laxity, Q-angle, patella height, tenderness, pattern of force development) and the hardness of the ground underneath. The diagnostic criteria include local pain, swelling, and tenderness upon clinical examination. Ultrasonography is a very useful tool in the diagnosis and in the follow-up.
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