Male pelvis

Introduction The male pelvis is slightly triangular, the two side walls are cohesive, the ischial spine is prominent, the pubic arch is narrow, the squatting is high arched, and the tibia is straight and forward, making the posterior sagittal diameter shorter. Such pelvis accounts for only 1% to 3.7% of women in China.

Cause

Factors affecting pelvic development:

(1) The development of the pelvis is influenced by the gender race. Different human races have different pelvic morphology. Oriental women have long waists and low breech.

(2) Environmental factors. There are often differences in pelvic morphology in different regions.

(3) Nutritional status can also affect the development of the pelvis. Such as rickets in childhood, due to the influence of mechanical force during walking, the anterior and posterior diameter of the pelvic inlet can be narrowed, the tailbone is hook-shaped to the pelvic outlet plane, and the osteomalacia is severe calcium deficiency, vitamin D and phosphorus in adulthood. Lack of production, more common in postpartum nutritional deficiencies, such as some areas can only drink millet soup after delivery, long-term nutritional deficiency makes the bone soft, and then the pelvis is severely deformed by the body's gravity and muscle ligaments.

(4) Some diseases are also related to pelvic development. For example, bone tuberculosis causes spinal deformity (commonly known as hunchback), which can affect the shape and size of the pelvis. The lower the spinal lesion, the greater the impact on the pelvis. Another example is scoliosis, which can cause a skewed pelvis if it occurs in the lumbar spine. Other lower extremity lesions such as tuberculous hip arthritis, poliomyelular lower extremity atrophy, or knee and ankle joint lesions have caused lameness before pelvic maturation, and can also cause a skewed pelvis.

(5) Trauma such as pelvic fractures, spinal fractures, and tailbone fractures also affect the shape and size of the pelvis.

an examination

Related inspection

Pelvic measurement

The entrance is slightly triangular, the two side walls are cohesive, and the ischial spine protrudes. The pubic bone arch is narrower, the sciatic notch is narrow and has a high arch shape, the tibia is straight and forward, and the sagittal diameter is shorter after the exit. The pelvic cavity is funnel shaped.

Differential diagnosis

Differential diagnosis of male pelvis:

1. Female pelvis: the most common pelvis for women. The entrance is horizontally elliptical, and the entrance diameter is slightly longer than the front and rear diameters. The side wall of the pelvis is straight, the ischial spine is not prominent, the pubic bone is wider, and the diameter of the ischial spine is 10 cm. Women in China account for about half.

2. Flat pelvis: more common. The entrance is oblate and has a transverse diameter greater than the anteroposterior diameter. The pubic bone is wide, the humerus loses its normal curvature, and it becomes straight to the back or deep arc, so the pelvis is shallow. Women in China account for about 25%.

3. Anthropoid pelvis: The entrance is oblong, and the anteroposterior diameter of the entrance is larger than the transverse diameter. The two sides of the pelvis are slightly cohesive, and the ischial spine is more prominent. The sciatic notch is wider, the pubic arch is narrower, and the tibia is inclined backwards, so the anterior part of the pelvis is narrower and the posterior part of the pelvis is wider. The tibia often has 6 knots, and the apes-like pelvis is deeper than other types. Women in China account for about 15%.

The entrance is slightly triangular, the two side walls are cohesive, and the ischial spine protrudes. The pubic bone arch is narrower, the sciatic notch is narrow and has a high arch shape, the tibia is straight and forward, and the sagittal diameter is shorter after the exit. The pelvic cavity is funnel shaped.

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