“…Spongiosa metal [ 3 ], one of the first commercially available porous cobalt-chromium biomedical products, was reported to have a survival rate between 88.8% [ 232 ] and 98% [ 233 ] in follow ups of 15, 20 or more years, with variable degree of stress shielding phenomena occurring in 21% of cases [ 232 ]. The clinical survival rate of cobalt-chromium cellular solids from 20 scientific papers [ 101 , 215 , [232] , [233] , [234] , [235] , [236] , [237] , [238] , [239] , [240] , [241] ] has been presented in Fig. 4 .…”