Background The surgical approach chosen for total hip arthroplasty (THA) may affect the positioning from the acetabular component. was only moderately accurate in placement the acetabular component in the acceptable zone. Rsum Contexte La voie dabord choisie pour une arthroplastie totale de la hanche (ATH) pourrait influer sur le positionnement du composant cotylo?dien. La prsente tude portait sur la prcision de lorientation du composant dans les interventions empruntant la 170151-24-3 manufacture voie de Hardinge modifie. Mthodes partir de la foundation de donnes sur les arthroplasties de notre tablissement, nous avons cherch puis retenu les individuals ayant subi une ATH entre 2003 et 2011 et ayant alors re?u une premire prothse mtal sur polythylne avec composant cotylo?dien hmisphrique ajust la presse. Nous avons inclus les individuals ayant subi des radiographies de 1 3 ans aprs lintervention afin de mesurer les perspectives dantversion et dabduction. Les valeurs juges 170151-24-3 manufacture acceptables taient respectivement de 15 10 et de 40 10. Rsultats Nous avons retenu 1241 individuals slectionns partir de Ngfr la foundation de donnes; la voie employe pour 1010 dentre eux tait la voie de Hardinge modifie. Langle dantversion du cotyle tait dans les limites acceptables chez 54,1 % des individuals, langle dabduction se trouvait dans les limites dfinies dans 79,2 % des cas, et les valeurs cibles taient respectes pour les 2 paramtres chez 43,6 % des individuals. Summary Nous avons conclu que la prcision du positionnement du composant cotylo?dien par la voie de Hardinge modifie est tout au plus modre, ce qui concorde avec dautres tudes visant valuer la prcision dautres techniques. Acetabular component positioning is definitely paramount for successful total hip arthroplasty (THA). Poor cup positioning affects impingement,1C5 dislocation rates6C10 and edge loading11 and may lead to liner fractures.3 Studies have shown that excessive abduction angle is correlated with increased bearing surface wear rates in metal-on-polyethylene and metal-on-metal articulations.12C15 In metal-on-metal hip resurfacing, Hart and colleagues16 showed increased blood metal ion levels in patients with insufficient cup version.16 However, acceptable cup position has been 170151-24-3 manufacture defined only in reference to dislocation rates, and its definition has been largely inconsistent in the literature. Lewinnek and colleagues6 defined a safe zone of 15 10 of anteversion and inclination angle of 40 10 based on 9 dislocations. In the mean time, McCollum and Gray8 suggested the cup to be placed between 20 and 40 of anteversion based on 5 dislocations. Although Lewinneks safe zone is considered obsolete by many cosmetic surgeons,17,18 it is often used in the literature to allow consistent assessment of results. Medical approach may influence dislocation rates, postoperative function, heterotopic ossification and the possibility of neurovascular damage.19C24 The selection of surgical approach is largely a matter of preference based on prior training of the surgeon. Callanan and colleagues25 identified medical approach to become an independent risk factor in glass malpositioning. They discovered a 68% occurrence of glass malpositioning by using the immediate lateral strategy weighed against 42.7% with all the posterolateral approach. Barrack and co-workers26 reported just 21% from the mugs located outside their described range using the anterolateral strategy. Both studies, nevertheless, used different appropriate 170151-24-3 manufacture runs for the glass placement, with an focus on the posterolateral strategy as the utmost popular operative strategy at their centres. Furthermore, the lateral strategies had been getting performed by low-volume doctors 170151-24-3 manufacture in both scholarly research, rendering it difficult to look for the generalizability of the full total outcomes. The improved Hardinge strategy may be the most common operative strategy utilized at our organization for total hip substitutes. This approach presents good visualization from the acetabulum, facilitating optimum glass positioning aswell as excellent balance of the full total hip joint. The goal of this research was to judge the precision of intraoperative acetabular element positioning with usage of the improved Hardinge strategy performed by high-volume doctors at a tertiary center. Methods Ethics acceptance was.