In a prospective study of children with pain in the knee, eight patients
(ten knees) were seen with the clinical and roentgenographic findings of
Sinding-Larsen-Johansson disease. The etiology appears to be a traction
tendinitis with de novo calcification in the proximal attachment of the
patellar tendon, which had been partially avulsed. The patients were
followed through the course of the disease, which was found to be
self-limited and benign like Osgood-Schlatter disease.