HippAp 12(13) :ܘܟܐܒܐ ܕܚܪܘܬܐ ܘܕܕܦܢ̈ܬܐ ܘܕܟܣܣ̈ܬܐ‏ : pain of the buttocks, sides, and loins
See the entire entry for ksāsā, ksāstā n.f. loin; sandal