Objective : the purpose was to find out the relationship between pelvic distortion and dysmenorrhea.

Study design : this was a case control study. The 80 subjects were devided into two groups, the 40 dysmenorrhea group and the 40 non-dysmenorrhea group. All were examed for pelvic distortion. The incident of pelvic distortion was compared between two groups.

Result : Odd ratio (95% CI) = 27.88 (3.50 – 596.37)

Conclusion : pelvic distortion was the cause factor of dysmenorrhea.

Key words : Pelvic distortion , dysmenorrhea