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Equatorial Fins to Enhance Press Fit of Cementless Cups With Ceramicon-Ceramicand Met-Met Articulation: Positive Experience With 3Different Models*Roberto Binazzi - UNIVERSITY OF BOLOGNA - Bologna, ITALYPaolo Dalla Pria - - Villanova di S. Daniele del Fr,Massimo De Zerbi - - Ravenna,Francesco Perdisa - University of Bologna - BOLOGNA, ITALY*Email: binazzi@gmail.comThe present clinico-radiographical study evaluated the long term performance of a Ti-Al-Valloy cementless modular press-fit cups (Fitek TM ) having, on the outer surface, an orientedmultilayer titanium mesh (Sulmesh TM ) with 65% tridimensional porosity and 2 fins applied tothe outer surface. Fins were initially designed for anti-rotatory purposes but showed to give anexcellent initial mechanical stability. Thus, in the following years, we have designed 2 othercups having 8 fins and ceramic insert. In this paper we compare the design and the resultsobtained with these 3 cups.We have reviewed the first 100 consecutive FITEK cups implanted in 92 patients with anaverage FU of 9,7 years (range 9-11 years). Results were evaluated with the Harris score. Wehad 86 Excellent, 10 Good, 2 Fair and 2 Poor. In this series we always used 28 mm heads.Dysplastic patients showed inferior results compared to arthritics patients in differentparameters, as pain, limp, ROM (p < 0.05), putting socks and shoes (p < 0.05).Radiographically, our cups were implanted in a fairly horizontal position (36.5° an average).At the last FU radiolucent lines were present in 14 % of the cases, never progressive.In no case we found a change of position of the cup, and in this series no revision wasnecessary.Between 2005 and 2008 we have implanted 140 consecutive Delta Fins cups with ceramic-onceramicarticulation. The fins of this cup have a trapezoidal shape, with HA coating. The cuphas an interference of 2 mm. The Delta ceramic insert allows the use of 32 or 36 mm heads.Clinico-radiographical results were very good. One cup needed to be revised for asepticloosening consecutive to a surgical error (undersizing)The H.M.S. cup is made of Porous Titanium with 8 fins having a triangular section, in order toincrease their penetration into cortical bone. The ceramic insert allows even larger ceramicinsert (32, 36 and 40). Preliminary clinico-radiographical results were excellent, with completeinitial mechanical stability and great ROM due to the large ceramic heads.The presence of fins on the outer surface of cementless cups enhances primary stability andfixation and the use of large ceramic heads improves ROM and subjective patients satisfaction.file:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]