Periods of rapid growth in which the quadriceps tendon puts traction on the apophysis of the tibial tubercle where the patellar tendon inserts.
The traction is worsened by sports that involve repetitive running, jumping, or kneeling.
Improves with rest.
1/4 of affected individuals have bilateral disease.
Adolescent male athlete (13-14 yo)
Younger (10-11 yo) affected females
Edema and tenderness over the tibial tubercle
A firm mass can sometimes be felt due to heterotrophic bone formation
Pain can be reproduced by extending the knee against resistance
Radiographic findings are nonspecific and include anterior soft tissue swelling, lifting of the tubercle from the shaft, and irregularity or fragmentation of the tubercle.