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the alignment accuracy and repeatability of the instrument. Although, the results in this studyare very promising, it is recognized that this was a small patient sample and controlled use byone surgeon. It is recommended that more studies be conducted of the alignment system in thehands of additional surgeon evaluators and on their patient populations.FiguresPoster: 18Minimum 25 Years Follow-Up of a Cementless Hip Stem: Definitive Resultsof Our 300 First CLS*Gianluca Cusma' Guatteri - HUMANITAS CLINICAL INSTITUTE - Rozzano, ITALYGuido Grappiolo - HUMANITAS CLINICAL INSTITUTE - ROZZANO, ITALY*Email: g.cdg@libero.itHigh survival rates have been reported for the uncemented CLS Spotorno stem in previouspublications by the designer’s surgery team. Analogous results were reported by severalindipendent works in which this stem was implanted, also in combination with different cups.To investigate the real longevity of this stem we performed an update of our follow-up (the lastwas published in 2003): in this work we report the outcome of first consecutive 299 patients(300 hips) in which the first generation CLS stem was implanted between 1983 and 1985, witha resulting minimum follow-up period of 25 years.We retrospectively evaluated radiographic and clinical results (by Harris hip score) of availablepatients. In order to obtain overall survival curves, we considered revision (or indication torevision) of the stem as the end point of the survival curve; patients who died with a wellfunctioning hip were not considered as failures; in only 1 case a patient deceased with apendant indication to revision. This way we found a trend comparable to our previous curvespublished in 2003.We also elaborated survival curves with asepting loosening of the stem as the only end point: inthis case we obtained a 95% isolated survival rate of the stem at 25 years (95% conï¬denceinterval, 91%–97%). Clinical scores definitively loose its importance at so long term follow-up(due to cup revision surgeries outcomes), anyway our median Harris hip score was 82 points.Surprisingly no thigh pain was reported in avalaible patients and no distal femoral osteolysiswas found in radiograms we could evaluate.The long-term survival of our CLS stem series favorably compares with other similar studiesfile:///E|/ISTA2010-Abstracts.htm[12/7/2011 3:15:47 PM]