HYDROXYAPATITE IN TOTAL HIP ARTHROPLASTY. OUR EXPERIENCE WITH A TITANIUM AND HYDROXYAPATITE DOUBLE-COATED CEMENTLESS STEM

Introduc on: Total hip arthroplasty (THA) could fail due to many factors and asep c loosening is one of the most common. In order to achieve an e ec ve osseointegra on contact porous bearing surface were developed. Objec vies: Aim of this retrospec ve study was to evaluate clinical and ra- diological mid-term outcomes of a porous tanium alloy/Hydroxyapa te double coa ng manufactured cementless femoral stem and to demonstrate the possibility to use this stem in di erent kind of femoral canals. Methods: Between January 2008 and December 2012, 182 consecu ve primary total hip arthroplas es (THAs) were performed using a porous - tanium alloy/Hydroxyapa te double coa ng manufactured cementless fem- oral stem. 182 pa ents were examined and 136 were female (74.7%) and 46 male (25.2%); average age was 72 years old (26-92). Harris Hip Scores (HHS) and Womac Scores were collected. All X-Ray images were analyzed in order to demonstrate stem survival rate and subsidence. Results: HHS was good or excellent in 85% and mean WOMAC score was 97.5 (73.4-100). No cases of early/late infec on or periprosthe c fracture were no ced, with an excellent implant survival rate (100%) in a mean period of 40 months (24-84). 5 cases presented acute implant disloca on, 2 due to wrong cup posi oning in a dysplas c acetabulum and 3 a er ground level fall. Dorr classi ca on of femoral geometry was used: 51 type A bone, 53 Type B and 78 Type C. Stem subsidence over 2 mm was considered as a risk factor of future implant loosening and was evidenced in 3 female pa ents with type C. Conclusions: This data reported an excellent implant survival rate in a mid- term period with a rate of 1,64% of subsidence. Radiological absence of pedestal has been accepted as sign of no excessive stress transmission to distal cortex due to its tapered diaphyseal region.This double coa ng can be considered a valid choice with an excellent medi- um-term survival and encouraging subsidence results