The authors present the way of usingallogenic,frozen, radio-sterilizated, spongybone grafts in operational reconstructing the defects of bone stock causedby looseningof the hip prosthesis.The bone grafts were sterelizated by radiation, formed in cubes and it hadthe fat removed. The operational reconstruction of the spongy bone was performed according to the method described by E.Gee,R.Lingand T.J.J.H.Sioof. Thirty five operations of the revision hip arthroplasty with usingthe bone grafts were madesince 1995. Just before transplantation the grafts were morselisedto pieces of size 3x 3x 3mm and then stuck inthe placeof the defect. Rebuildingof the morselisedgrafts of the spongy bone starts from activating osteoblasts, while the same process in the compact bone starts with osteolysis by activating osteoclasts. The mechanical durability of these grafts is also very high. We claim that the biological connection between the host bone and the graft forms in a couple of weeks, but the formingof a solid, fully functional bone takes about few months. Only radiological examinationshows the stage of allografts incorporation into host's skeleton. Between these 35 operations 2 patients needed to be operated again,because of the grafts resorption. In conclusion, operative revision hip arthroplasty to require the specialoperating tools large quantities spongy bone allografts.

Keywords: revision arthroplasty, prosthesis loosening, spongy allografts, frozen allografts