Variability in size and shape of male and female sacrum in the middle and lower Volga regions

Abstract

Objective: identification of variability in the size and shape of the sacrum of men and women of the Middle and Lower Volga regions. Material and methods. Macerated sacrums 21 men aged 18-75 and 21 women aged 22-85. Osteometry was performed according to the method of V. P. Alekseev. Results. In the sacrum of men, the sagittal diameter (by 3 mm, p<0.001) and width of the body of the first vertebra (by 4 mm, p=0.003), height (by 8 mm, p=0.006) and width (by 5 mm, p<0.001) predominate) ear-shaped surfaces, the lower width of the sacrum (by 7 mm, p=0.007). In the sacrums of women, the upper width of the pelvic surface (by 7 mm, p=0.008) and the sagittal diameter of the sacral canal (by 1 mm, p=0.007) predominate. The index of narrowing of the sacrum as a whole (63.8% in men, 58.5% in women) and the index of narrowing in the lower part (75.5% in men, 69% in women) demonstrate a high level of statistical significance of differences (by 5.3%, p=0.001, and 6.5%, p=0.008, respectively). Conclusion. The revealed variability in the size and shape of the sacrum of men and women of the Middle and Lower Volga regions lies in the large size of the body of the first vertebra and ear-shaped surface of the male sacrum, which is less narrowed in the lower part than the female one, while in women the sacrum has a greater degree of narrowing from top to bottom.