[TA] the syndesmoses and synovial joints that unite the sacrum and the two hip bones to form the pelvic girdle; these are the sacroiliac joints, the pubic symphysis, the sacrotuberal and sacrospinal ligaments, and the obturator membrane. SYN: juncturae cinguli pelvici [TA], articulationes cinguli membri inferioris, joints of inferior limb girdle.