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Thread: Europid Pelvic Morphology

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    Member Theudanaz's Avatar
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    Europid Pelvic Morphology

    Are there any noticeable differences in pelvis shapes between europids and non-europids? I wonder specifically about how iliac geometry relates to hip geometry in europid females. i have seen examples of laterally acromegalic iliac crests in respect to hip joints in females so that the effect of the lines formed by the edge of the ilium to the edge of the hip is not normal but its inverse, i.e. a parallelogram whose smaller end is at the bottom instead of the top. I wonder about the racial origin of such variation.


    I've found a couple brief references online:

    PELVIC FLOOR DIFFERENCE:
    Conclusions : In African American women, the posterior pelvic floor area is 10.4% smaller than in European American women, resulting in a 5.1% smaller total pelvic floor area. (Am J Obstet Gynecol 2002;187:111-5.)

    Source

    Results

    Subjects were similar in age and body mass index. Levator ani volume was significantly greater in the AA versus the WA group (mean = 26.8 vs 19.8 cm3, P = .002). The levator-symphysis gap was smaller in the AA (left-18.2, right-18.8 mm) versus the WA group (22.4, 22.6 mm, P = .003, .048) on the left and right. Significant differences were seen in bladder neck position, urethral angle, and the pubic arch angle.

    Conclusion

    The increased muscle bulk and closer puborectalis attachment seen among the African-American nulliparous women may impact the development of pelvic floor dysfunction. These findings need further study.

    Key words: Magnetic resonance imaging; Levator ani; Pelvic morphology; Racial differences; Three-dimension reconstruction

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    CONCLUSIONS: Significant differences in pelvic soft tissue geometry is seen between African American nulliparas when compared to age matched Caucasian nulliparas. Increased pelvic muscle bulk is seen among the African American nulliparas. The pubic arch angle is slightly but significantly larger in our group of African American nulliparas, compared to the Caucasians. Further studies are needed to evaluate the clinical significance of these differences and their impact on pelvic floor dysfunction risk factors. (Support: NIH R01 HD38661, NIH-P01 CA67165-06)

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    Abstract Pelvic X-rays of 99 adult patients (198 hips) were analysed in 58 men and 41 women to determine the morphology of the adult hip in Malawians. For each hip the centre edge angle of Wiberg, the acetabular angle of Sharp and the acetabular head index were measured. For each parameter, women were more dysplastic than men, and for the acetabular angle of Sharp there was a significant gender difference (p<0.05, t test). Our figures were compared to those of Fujii et al. who had measured the same parameters in Japanese and British hips. His results taken with ours showed that within a racial group, women were more dysplastic that men and that Japanese hips were more dysplastic than British hips, which were in turn more dysplastic than Malawian hips.

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    Descriptions of Southwest Asian Neandertal os coxae have stressed the supero-inferior flattening and acetabulo-symphyseal elongation of the superior pubic rami. Further analysis of Neandertal pubes, including two European specimens. La Ferrassie I and Krapina 208, indicates that Neandertal pubes are distinguished primarily by a relative elongation of the superior rami. The supero-inferior flattening of the pubic rami with the formation of a distinct ventral border, present among the Southwest Asian Neandertals, is less pronounced among the European Neandertals. Neither sexual dimorphism nor biomechanical hypertrophy appears adequate to explain this morphological pattern of Neandertal pubic bones.

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    You have the Neanderthal condition. Think of Europeans as 5% Neanderthal and contrast this with non-Europeans and you have your answer.

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