Revolutionary New Bone Cement Technique by Interposing HA Granules Between Bone and Bone Cement

Abstract

Less than two layers of HA granules (100-300µm or 300-500 µm) were smeared onto the bone surface just before the cement fixation of the components. Care was taken to implant the components under complete hemostasis. The patient group comprised 268 THAs in 232 patients performed with this cementing technique between 1987 and 1989. Six acetabular components were defined as radiologically loose and one hip was revised at 7 years after the operation. Overall, radiological loosening rate for acetabular component was 2.6%. No femoral component was defined radiologically loose. On the dense bone, new dense bone grew into the spaces of HA particles and new dense bone layers were formed by new bone and HA particles. On the cancellous bone, new cancellous bone layers were formed by new cancellous bone and HA granules as well. In IBBC, as HA is osteoconductive and bone ingrowth into HA granules is obtained, even if bony atrophy or osteoporosis occurs long terms after surgery, bone ingrowth will continue forever and no RLL will not appear.