Osgood Schlatter disease

Overuse, repetitive strain onto 2nd ossification center
Bone growth rate >> soft tissue growth
Young, active, male, jumping sport
13-14 y/o

P/E
Reproducible knee pain
Pain on resisted extension, pain on full flexion
25% bilateral
pain on proximal tibial tuberosity
tenderness, thickening of proximal tibia
proximal mirgration of patellar tendon insertion area

differential diagnosis
．Slidung-Larsen Johnssen Disease: calcified patellar tendon insertion
．Jumper’s knee
．Quadriceps avulsion
．Overuse syndrome
．multipartie patella
．plica syndrome
．chondromalacia patellae

X-ray
．knee lateral view with 10-20 degree internal rotation
．rule out malignancy, fracture, infection
．superficial ossicle in patellar tendon
Bone scan
．increased uptake

Management
Conservative treatment: rest, NSAIDs, Icy packing, immobilization

Prognosis
．spontaneously resolved within one year
．persisted until closure of physeal plate