The Pelvic Girdle

The pelvic girdle, composed of the sacrum and the coxal bones, has seven asymptomatic osseous variations (AOVs). Most of the studies performed on the pelvic girdle are based on dry bones, and this area has been less studied than the rest of the skeleton. The sacrum is made up of five sacral vertebrae, each composed of three primary ossification centers, except for the first two sacral vertebrae, which are formed by two additional centers for the lateral elements. Four AOVs are observable for the sacrum. The coxal bone forms from three primary ossification centers representing the ilium, pubis and ischium. Regarding the coxal bone, three AOVs can be observed. The acetabular mark should be sized after the fusion between the three bones composing the coxal bone, that is, at the end of puberty.