There has been only one report on the physical characteristics of patients with developmental cervical spinal canal stenosis. The objective of this consecutive clinical study was to identify the physical characteristics of patients with developmental cervical spinal canal stenosis. The subjects were 243 patients with cervical spine disease who received treatment in our department between April 2001 and March 2002. These patients were divided into two groups (the groups of patients with and without spinal canal stenosis) on the basis of their lateral cervical spine radiographs. The six items examined were height, weight, sitting height, inter inner canthal distance, upper arm length, and head circumference in each patient, and then their values were compared between the two groups. The mean inter inner canthal distance was 2.7 cm in the group of patients with spinal canal stenosis and 3.5 cm in the group of patients without spinal canal stenosis; a significant difference (P < 0.01) was observed. Regarding height, weight, sitting height, upper arm length, and head circumference, no significant difference was found while comparing the two groups. In conclusion, developmental cervical spinal canal stenosis seems to be highly likely in patients with smaller inter inner canthal distance.