Background: The purpose of this clinical case report is to confirm sacroiliac joint misalignment effects on the gait. Methods: A healthy women volunteered to participate in this case report. Measurement of the subject was performed two categories. One is physical examination of the pelvic by inspection, palpation, movement based tests and pain provocation tests. The other one is gait performance measurement by 3 dimentional motion analysis. Results: Diagnosis by physical examination of the subject was Lt. ilium posterior rotation. Pelvic, hip, knee and ankle in the 3 dimensional kinematic data, the most notable result was the ankle. Conclusion: To confirm the effect of the misalignment of the sacroiliac joint on the gait function, it must be evaluated by integrating the movement to the ankle from the lumbar.