sacrospinous
adjective medical specialized uk/ˌseɪ.krəʊˈspaɪn.əs/ us/ˌsæk.roʊˈspaɪn.əs/
骶棘的
relating to the area between the sacrum (= a bone at the base of the back) and the thin, pointed, sticking out part of the ischium (= the lower pelvic bone)
the sacrospinous ligament 骶棘韧带