Initial stability of a cementless acetabular cup design: Experimental investigation on the effect of adding fins to the rim of the cup

Different design solutions have been suggested for improvement of the initi al stability of cementless acetabular cups, such as adding threads, spikes, or pegs to the hemispherical geometry, the pore structure of the surface. and screw fixation. This experimental study investigated the effect of fins on the initial stability of the acetabular cup. Three designs were studied , with none, 2, and 12 fins, respectively. The cups were press fit into cav ities reamed in 2 different polyurethane foams, used to simulate 2 qualitie s of cancellous bone. Two millimeter press-fit and exact-fit conditions wer e investigated. The results show that the type of substrate and the interfe rence value are important in determining the initial stability of the cup. The addition of fins on the cup rim enhances in vitro the initial stability , especially in cases of a poor press fit with a good substrate. This precl inical investigation suggests that the use of a cup design with fins may be beneficial in all cases in which press fit of the cup cannot be assured. H owever, further clinical studies are required to validate in vivo the effic acy of the fins as additional fixation devices.