The Usage of Frozen Allografts of the Spongy Bone in Filling the Loss of Bone after Loosening of the Hip Prosthesis

: The authors present the way of using allogenic, frozen, radio-sterilizated, spongy bone grafts in operational reconstructing the defects of bone stock caused by loosening of the hip prosthesis. The bone grafts were sterelizated by radiation, formed in cubes and it had the fat removed. The operational reconstruction of the spongy bone was performed according to the method described by E. Gee, R. Ling and T.J.J.H. Sioof. Thirty five operations of the revision hip arthroplasty with using the bone grafts were made since 1995. Just before transplantation the grafts were morselised to pieces of size 3 x 3 x 3 mm and then stuck in the place of the defect. Rebuilding of the morselised grafts 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 forming of a solid, fully functional bone takes about few months. Only radiological examination shows 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 special operating tools large quantities spongy bone allografts.