Radiographs reveal rarefaction of the ossification center of the trochlea with condensation and collapse. Because the trochlea has a multicentric, irregular, and granular ossification center compared to the capitulum, comparison views and radiographic follow-up should be used to distinguish normal variants of ossification from Hegemann disease.
The main differential consideration is osteochondritis dissecans, which tends to affect older patients (12-15 years, around the time of epiphyseal plate ossification), does not affect the entire ossification center (only the subchondral bone), and is not a self-limited process. Chondroblastoma is also a consideration, as it tends to affect the epiphysis.
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