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Metals 2017,7, 91 Acknowledgments:Wearegrateful for thefinancial supportprovidedbytheFederalMinistryofEducationand Research(03FH005IX5). AuthorContributions: Wepoint out that all authorswere fully involved in the study and in preparing the manuscript. V.W., P.D. andH.S.designed the study. V.W.generated theCADsampleswith support ofH.H. andwas involved in themanufacturing process of the scaffolds. V.W. andP.D. performed the experiments, analyzedthedatawithsupportofN.L.andwrote the initialmanuscript.H.H.andR.B.organizedtheresearch funding. All authors ensured the accuracy of thedata and the analyses and reviewed themanuscript in its currentstate. Conflictsof Interest:Theauthorsdeclarenoconflictof interest. References 1. Heinl,P.;Müller,L.;Körner,C.;Singer,R.F.;Müller,F.A.CellularTi-6Al-4Vstructureswith interconnected macroporosity.ActaBiomater. 2008,4, 1536–1544. [CrossRef] [PubMed] 2. Geetha,M.;Singh,A.K.;Asokamani,R.;Gogia,A.K.Tibasedbiomaterials, theultimatechoicefororthopaedic implants—Areview.Prog.Mater. Sci. 2009,54, 397–425. [CrossRef] 3. Hazlehurst,K.;Wang,C.J.; Stanford,M.Evaluationof thestiffnesscharacteristicsofsquareporeCoCrMo cellular structuresmanufacturedusing lasermelting technology for potential orthopaedic applications. Mater.Des. 2013,51, 949–955. [CrossRef] 4. Attar,H.;Calin,M.;Zhang,L.C.;Scudino,S.;Eckert, J.Manufacturebyselectivelasermeltingandmechanical behaviorofcommerciallypure titanium.Mater. Sci. Eng.A2014,593, 170–177. [CrossRef] 5. Attar, H.; Löber, L.; Funk,A.; Calin,M.; Zhang, L.C.; Prashanth, K.G.Mechanical behavior of porous commerciallypureTiandTi–TiBcompositematerialsmanufacturedbyselective lasermelting.Mater. Sci. Eng.A2015,625, 350–356. [CrossRef] 6. Wauthle, R.; van der Stok, J.; Yavari, S.A.; vanHumbeeck, J.; Kruth, J.P.; Zadpoor, A.A.; Weinans,H.; Mulier,M.; Schrooten, J. Additivelymanufactured porous tantalum implants. Acta Biomater. 2015, 14, 217–225. [CrossRef] [PubMed] 7. Thijs,L.;Sistiaga,M.L.M.;Wauthle,R.;Qingge,X.;Kruth, J.-P.;Humbeeck, J.V.Strongmorphologicaland crystallographictextureandresultingyieldstrengthanisotropyinselectivelasermeltedtantalum.ActaMater. 2013,61, 4657–4668. [CrossRef] 8. Öhmann, C.; Baleani, M.; Pani, C.; Taddei, F.; Alberghini, M.; Viceconti, M.; Manfrini, M. Compressivebehaviourofchildandadult corticalbone.Bone2011,49, 2011. [CrossRef] [PubMed] 9. Grimal,Q.Assessmentofcorticalboneelasticityandstrength:Mechanical testingandultrasoundprovide complementarydata.Med. Eng. Phys. 2009,31, 1140–1147. [CrossRef] [PubMed] 10. Lewis, G. Properties of open-cell porousmetals and alloys for orthopaedic applications. J.Mater. Sci. Mater.Med. 2013,24, 2293–2325. [CrossRef] [PubMed] 11. Abele,E.;Stoffregen,H.A.;Kniepkamp,M.;Lang,S.Selective lasermeltingformanufacturingof thin-walled porouselements. J.Mater. Process. Technol. 2015,215, 114–122. [CrossRef] 12. Guo,C.;Ge,W.;Lin,F.EffectsofscanningparametersonmaterialdepositionduringElectronBeamSelective MeltingofTi-6Al-4Vpowder. J.Mater. Process. Technol. 2015,217, 148–157. [CrossRef] 13. Song,B.;Dong,S.;Zhang,B.;Liao,H.;Coddet,C.Effectsofprocessingparametersonmicrostructureand mechanicalproperty.Mater.Des. 2012,35, 120–125. [CrossRef] 14. Yadroitsev, I.; Krakhmalev, P.; Yadroitsava, I. Selective laser melting of Ti6Al4V alloy for biomedical applications temperaturemonitoringandmicrostructural evolution. J.Alloy. Compd. 2014,583, 404–409. [CrossRef] 15. Vrancken,B.;Thijs,L.;Kruth, J.P.;vanHumbeeck, J.Heat treatmentofTi6Al4VproducedbySelectiveLaser Melting:Microstructureandmechanicalproperties. J.Alloy. Compd. 2012,541, 177–185. [CrossRef] 16. Luxner,M.H.; Stampfl, J.; Pettermann,H.E.Finite elementmodelingconcepts and linearanalysesof 3D regularopencell structures. J.Mater. Sci. 2005,40, 5859–5866. [CrossRef] 17. Gibson,L.J.;Ashby,M.F.; Schajer,G.S.; Robertson,C.I.Mechanicsof two-dimensional cellularmaterials. Proc.R.Soc. Lond. Ser.AMath. Phys. Sci. 1982,382, 25–42. [CrossRef] 18. Campoli,G.;Borleffs,M.S.;Yavari,S.A.;Wauthle,R.;Weinans,H.;Zadpoor,A.A.Mechanicalpropertiesof open-cellmetallicbiomaterialsmanufacturedusingadditivemanufacturing.Mater.Des. 2013,49, 957–965. [CrossRef] 71