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".
There are several conditions to distinguish between Sinding Larsen Johansson Syndrome, including Osgood-Schlatter disease, jumper's knee, patellar sleeve fractures, normal ossification center at the inferior pole of the patella.
Osgood-Schlatter disease occurs at the inferior attachment of the patellar tendon onto the tibial tuberosity
jumper's knee occurs same location and similar pathology, but seen in adults (some authors do not distinguish between Sinding-Larsen-Johansson and jumper's knee)
patellar sleeve fractures: Sinding-Larsen-Johansson disease and sleeve fractures are two injuries that occur at the inferior pole of the patella in children.
SLJ is a chronic tendinitis accompanied by calcification of the avulsed patellar tendon.
PSA are acute injuries that involve a complete avulsion of the proximal insertion of the patellar tendon with a small fleck of bone and portion of patellar articular cartilage.
Normal ossification center at the inferior pole of the patella: revealed no edema to suggest a traumatic etiology
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