[A boy with a white striped knee on a radiograph]. / Witte strepen op een röntgenfoto van de knie.

A 10-year-old boy presented at the radiology department with pain in the right knee. Radiographs of the knee revealed dens metaphyseal bands and subchondral epiphyseal sclerosis as a result of periodic bisphosphonate administration for the treatment of Legg-Calvé-Perthes disease three years ago.