The [[1]] bones are primarily shaped by their function in supporting the weight of the upper body and facilitating movement.

The pelvic bones are a group of bones in the lower torso that form the pelvis. The pelvis serves as a supporting structure for the spine and legs. The two hip bones, the sacrum, and the coccyx are the main bones in the pelvis.

The pelvic bones are primarily shaped by their function in supporting the weight of the upper body and facilitating movement. The attachments of the legs and hips are important, but they are not the primary determinant of pelvic bone shape.