Techniques to Improve the Shear Strength of Impacted Bone Graft

Bone substitution in revision hip replacement

“…These authors concluded that low migration of the femoral stem was related to the graft preparation, leading to an increased hardness. These findings agree with experimental data reported by Dunlop et al [6]. These authors have shown that a significant improvement of graft shear strength could be expected after the removal of fat and marrow fluids.…”

“…Subsidence of the stem has been commonly reported [7,9,11,15,25,27]. Among various variables, intrinsic allograft properties (particle morphology and size, composition, quality and preparation) have been shown to influence the initial stability of the composite [1,6]. Synthetic ceramic bone grafts have been demonstrated to exhibit both much greater mechanical stability and reproducibility than pure allograft in experimental tests [12].…”

Influence of water and fat content on compressive stiffness properties of impacted morsellized bone: An experimental ex vivo study on bone pellets

“…Centrifuging the bone mass could change the size and distribution, with unpredictable effects on mechanical behavior (Brewster et al 1999). Granulate moisture influences mechanical behavior (Giesen et al 1999, Ullmark and Nilsson 1999, Voor et al 2000, Dunlop et al 2003. The first impaction strokes on loose morsellized bone remove air and some fluids.…”

“…Early axial subsidence and torsion may disturb the geometry of the implant system and hence reduce the durability of the revised prosthesis (Franzén et al 1995, Eldridge et al 1997, Brodt et al 1998, Ornstein et al 2002. Various factors influence the mechanical stability of impacted bone: particle size and grading (Brewster et al 1999, Ullmark 2000, moisture (Voor et al 2000, Dunlop et al 2003, addition of bone substitutes (Verdonschot et al 2001), and impaction energy (Ullmark 2000, Fosse et al 2004. Despite extensive application, the significance and function of several of these factors is obscure.…”

Factors Influencing the Stability of Stems Fixed with Impaction Graft in Vitro

“…Several studies experimentally investigated the mechanical properties of impacted bone particles [5,6], but the bone particles were compacted into the cylindrical camber; thus, these conditions are different from those when bone particles are impacted in the femoral canal. In fact, the size distribution of bone particles depends on the type of bone mill.…”