Intramedullary ntsia thawv yog ib qho kev phais implantused los kho fractures ntawm cov pob txha ntev, xws li lub femur (thigh pob txha) thiab tibia (shinbone). Nws yog ib tug ntev, hlau pas nrig uas yog ntxig rau hauv lub hollow center ntawm cov pob txha (medullary kwj dej), muab internal kev txhawb nqa thiab stability rau lub breakbone.feem ntau siv nyob rau hauv cov ntaub ntawv ntawm compleXfractures los yog thaum lwm fixation yog tsis tsim nyog.Lawv yuav pab txhawb kev kho mob thiab txo cov kev pheej hmoo ntawm cov teeb meem, xws li nonunion los yog malunion.