A 13-year-old girl rode her bike 30 minutes a day to school for two months with anterior knee pain without any history of direct trauma. what is the diagnosis? Sinding Larsen Johansson Syndrome (SLJS) is a juvenile osteochondrosis and traction epiphysitis affecting the extensor mechanism of the knee Some authors classify Sinding-Larsen-Johansson disease as a pediatric version of "jumper's knee"...