Exact prevalence is unknown. It is more common in children who participate in sport. In a Finnish study, 21% of athletic adolescents had OSD, compared with only 4.5% of the non-athletic ones.[2] The condition typically appears between ages 8 and 12 years in girls, and 12 and 15 years in boys; males are affected more often than females. It is bilateral in 20% to 30% cases.[1][3]

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