Introduction: Osteochondrosis of the primary ossification center of the patella (Kohler's Disease) is a rare and self-limiting condition of unknown etiology. Sometimes it may be found as normal variant.
Case report: A 7-year-old boy presented with anterior right knee pain. On radiological examination, there was increased density, irregularity, and fragmentation of the patellar primary ossification center. Activity modification and exercise led to marked symptomatic improvement after 1 year.
Conclusion: It was concluded that the disease either physiological or pathological, diagnosis is usually difficult. However, the treatment is simple. There was improvement functionally as well as radiologically with activity modification.
Keywords: Osteochondrosis; patella; primary center.
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