Mechanical Properties Of 7-10 Mm Bone Grafts And Small Slurry Bone Grafts In Impaction Bone Grafting

Objective:To compare the mechanical properties of morselized cancellous bone grafts of two sizes:7-10 mm bone and small slurry bone (about 2 mm).Methods:The in vitro test was designed to simulate the hammer and impactors system for impaction bone grafting in clinical procedure.Results:The 7-10 mm bone grafts showed higher height, elastic modulus and massive extrusion strength than those of the small slurry bone grafts. There was no difference in yield strength. The bone mineral density of the 7-10 mm grafts kept increasing during the impaction procedure and became higher than that of the small slurry bone grafts after 10 impactions.Conclusions:The results obtained here demonstrated that the small slurry bone grafts exhibit worse mechanical properties as compared with the 7-10 mm bone grafts, which implies that the use of this material in reconstruction of bone defect in the acetabular side should be limited.