Figure 3From: Prevalence of radiographic findings of femoroacetabular impingement in the Japanese populationInfluence of acetabular retroversion on the development of arthritis in dysplastic hips. After a follow-up period of up to 180 months, the Kaplan-Meier estimate showed that the presence of the crossover sign (COS) did not affect the prognosis of patients with dysplastic hips (P = 0.713, log-rank).Back to article page