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How does the pelvic girdle support the legs and body weight?

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Front and back views of the human skeleton are shown side by side, with labeled bones including the skull, spine, ribs, pelvis, arms, legs, hands, and feet. Insets detail the bones of the foot and hand, highlighting major bone groups and anatomical terms. — human skeleton Front and back views of the human skeleton.

The pelvic girdle is a basin-shaped complex of bones that serves as the critical link between the trunk and the legs, facilitating the support and balance of the body.1

In humans, who maintain an erect posture, the pelvic girdle is essential for weight-bearing. When standing, the body's center of gravity falls over the center of the body, and weight is transmitted from the vertebral column through the pelvis to the femur, knee, and foot.1

The structural support is achieved through several key mechanisms:
* Connection to the Axis: The pelvic girdle is firmly bound to the vertebral column at the sacroiliac joint by strong ligaments, which stabilize the connection between the trunk and the lower limbs.2
* Weight Distribution: The girdle consists of the ilium, ischium, and pubis, which unite at the acetabulum. This deep, cup-shaped socket secures the head of the femur, creating a stable hip joint capable of supporting the body's weight.312
* Muscular Attachment: The pelvis provides essential attachment points for muscles that balance the trunk and move the legs, further aiding in stability and locomotion.1