aufsatzsammlung biocompatibility biocompatiblematerials biomateriais biomecanica biomechanicalphenomena biomechanics biomechanik biomedicalmaterials blood boneandbones bones implantedeossoorganico knochen knochenersatz materials materialstesting mechanicalproperties mechanicalstress methods orthopedicimplants ossoeossos physiology prosthesesandimplants prosthesis proteseseimplantes surfaceproperties surplusgovernmentproperty tensilestrength testing