Staging puberty in slipped capital femoral epiphysis: importance of the triradiate cartilage.

In 83 children with slipped capital femoral epiphysis, puberty was staged at the time of diagnosis using bone age, closure of triradiate cartilage, Risser index, and the pubertal diagram of Dimeglio. In boys 95% and in girls 83% of slips occurred during the accelerating phase of puberty (stage 1 and 2), in which mainly the limbs grow. In boys (54%) and in girls (66%), most slips occurred in stage 1. The triradiate cartilage was still open at the time of diagnosis in 65% of boys and 64% of girls. Staging puberty is useful to differentiate the risk for slipped capital femoral epiphysis and to evaluate the risk for a contralateral slip. Closure of the triradiate cartilage is a simple measure to identify this risk. Once the triradiate cartilage is closed, there is a 4% chance of a contralateral slip.