Method and device for determining the local mechanical resistance inside of a porous body having a variable density and/or porosity, in particular inside of a porous bone structure comprising the following steps: - selecting a site of said porous body destined to receive a fixation element, in particular a screw or a bone implant - drilling a hole into said porous body and - measuring a mechanical parameter of the porous structure surrounding said drilled hole by inserting a suitable tool (1 ) into said drill hole.Method and device for determining the local mechanical resistance inside of a porous body having a variable density and/or porosity, e.g. a porous bone the method comprising: selecting a site of said porous body destined to receive a fixation element, in particular a screw or a bone implant drilling a hole into said porous body and measuring a mechanical parameter of the porous structure surrounding said drilled hole by inserting a suitable tool (1) into said drill hole. The device comprises : A) a tool (1) with a shank (4) designed such that it is insertable into a hole artificially drilled into said body and that is capable of exerting a torsional force on said porous structure surrounding said drilled hole by inserting said shank (4) of the tool (1 ) into said drill hole B) a measuring unit (20) determining elastic or destructive properties of said porous body generated by torsion force of said tool in said porous body C) displaying properties of said porous body determined by said measuring unit (20).Procédé et dispositif servant à déterminer la résistance mécanique locale à lintérieur dun corps poreux ayant une densité et/ou une porosité variables, par exemple dun os poreux, ledit procédé consistant à : sélectionner un site dudit corps poreux destiné à recevoir un élément de fixation, en particulier une vis ou un implant osseux percer un trou dans ledit corps poreux et mesurer un paramètre mécanique de la structure poreuse entourant ledit trou percé
