This longitudinal study investigated the ultrasound appearance of the patellar tendon attachment to the tibia throughout puberty in young tennis players with and without Osgood-Schlatter disease (OSD). Twenty-eight competitive players (17 boys), aged 10.6-15.3 years, had bilateral ultrasound imaging of the patellar tendon attachment to the tibia at baseline and 1 year later. On each occasion, anthropometric measurements, pubertal status and injury history were recorded. Ultrasound appearance of the patellar tendon attachment was categorized into three stages: cartilage attachment, insertional cartilage and mature attachment. Stage 1 appearance, a large anechoic region with or without ossicles and irregularity of the apophysis that are classically associated with OSD, was found in eight players, seven of them were pain free. A majority (62%) of the patellar tendons in stage 1 at baseline progressed toward stage 2 or stage 3 1 year later. Likewise the patellar tendon attachment in most athletes with cartilage insertion showed progression to a mature enthesis over 1 year. The imaging appearance that is classically interpreted as OSD was common in asymptomatic knees. This ultrasonographic description of the patellar tendon attachment to the tibia during growth provides a reference for the assessment of bone tendon attachments in adolescents.
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