of alpha angle and horizontal toit externe angle. Table 1 shows a summary of the results. Figure 1 shows the bimodal distribution of alpha angle. Figure 2 shows a scatter plot of alpha angle by side, highlighting both bilateral and unilateral head asphericity. In addition, with an alpha angle cut point of 65 for cam type femoroacetabular impingement (FAI), 31.7% the cohort would be considered to have some degree of FAI, 45.8% of that bilateral. Ă ĂConclusion: Wide variation in hip morphology is present in the normal population. The most interesting of findings were in relation to alpha angle, which showed a bimodal distribution, suggesting a discrete pathological entity, this when combined with its discrete asymmetry suggests and acquired pathology. This is further supported by the normal distribution and symmetry of the other morphological variables. The detailed description of hip morphology in this population cohort has clinical significance in providing a normal reference range for morphological measurement and suggests an acquired process for cam type deformity.

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