• 95% reference intervals limits of FAI morphotype were beyond currently defined thresholds. • Reference intervals of pincer-type morphotype measurements were close to current definitions. • Reference intervals of cam-type morphotype measurements were far beyond the current definitions. • Current morphometric definitions of cam-type morphotype should be used with care.

The prevalence and measurement values of most CT signs of FAI morphotypes were high and equivalent between the two age groups of patients with asymptomatic nonosteoarthritic hips.