The Symphysis Pubis (SP) joint was investigated by X-ray in 96 adults without any history of disease of the joints. We evaluated the width of this joint by measuring the distance between the two articular surface at three points. We calculated the mean for the three interpubic distances and carried out statistical analysis so as to evaluate if there is a significative difference between the four age classes (< 50; 50-59; 60-69; > 70) and between males and females. We did not found statistically-significative differences between males and females, and between the age classes; nevertheless, it is to be noted that a slight widening of the SP joint can be seen in the elderly, which is thus not significant. We also noted that the medium part of the SP joint undergoes a larger widening in older people: this is probably due to degenerative changes in the fibrocartilagineous disc and the ligaments.
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