title: Biomechanical evaluation of a novel Limb Prosthesis Osseointegrated Fixation System designed to combine the advantages of interference-fit and threaded solutions.
abstract: OBJECTIVE
  The study was aimed at biomechanical evaluation of a novel Limb Prosthesis Osseointegrated Fixation System (LPOFS) designed to combine the advantages of interference-fit and threaded solutions.
  
  
  METHODS
  Three cases, the LPOFS (designed), the OPRA (threaded) and the ITAP (interference-fit) implants were studied. Von-Mises stresses in bone patterns and maximal values generated while axial loading on an implant placed in bone and the force reaction values in contact elements while extracting an implant were analysed. Primary and fully osteointegrated connections were considered.
  
  
  RESULTS
  The results obtained for primary connection indicate more effective anchoring of the OPRA, however the LPOFS provides more appropriate stress distribution (lower stress-shielding, no overloading) in bone. In the case of fully osteointegrated connection the LPOFSs kept the most favourable stress distribution in cortical bone which is the most important long-term feature of the implant usage and bone remodelling. Moreover, in fully bound connection its anchoring elements resist extracting attempts more than the ITAP and the OPRA.
  
  
  CONCLUSIONS
  The results obtained allow us to conclude that in the case of features under study the LPOFS is a more functional solution to direct skeletal attachment of limb prosthesis than the referential implants during short and long-term use.
authors.affiliation: Department of Biocybernetics and Biomedical Engineering, Faculty of Mechanical Engineering, Białystok University of Technology, Białystok, Poland.
authors.forename: Piotr
authors.initials: P
authors.lastname: Prochor
authors.affiliation: Department of Biocybernetics and Biomedical Engineering, Faculty of Mechanical Engineering, Białystok University of Technology, Białystok, Poland.
authors.forename: Szczepan
authors.initials: S
authors.lastname: Piszczatowski
authors.affiliation: Department of Biocybernetics and Biomedical Engineering, Faculty of Mechanical Engineering, Białystok University of Technology, Białystok, Poland.
authors.forename: Eugeniusz
authors.initials: E
authors.lastname: Sajewicz
mesh_terms: D000672:Amputation Stumps / Q000503:physiopathology* / Q000601:surgery; D001186:Artificial Limbs; D001863:Bone Screws; D000069343:Bone-Implant Interface / Q000503:physiopathology* / Q000601:surgery; D003198:Computer Simulation; D017076:Computer-Aided Design; D019544:Equipment Failure Analysis; D020342:Finite Element Analysis; D006801:Humans; D008954:Models, Biological; D017755:Prosthesis Fitting / Q000295:instrumentation* / Q000379:methods; D019919:Prosthesis Implantation / Q000295:instrumentation* / Q000379:methods; D016896:Treatment Outcome