The Design Features And Results Of A Cementless Anatomic Total Hip Arthroplasty

Objective The purpose of the present study was to evaluate the design features and results of the cementless anatomic Ribbed femoral stem(Ribbed stem) in total hip arthroplasty(THA).Methods We reviewed the cases of 52 patients(52 hips) who had Ribbed stem in THA between March 2010 and March 2012. There were 20 males and 32 females; The mean age was 59 years. The mean follow-up was 3.1 years. Demographic data, the Harris hip score, the rate of postoperative thigh pain, the incidence of intraoperative femoral fracture, wound healing, dislocation and revision were recorded. Radiographic evaluation was used to evaluate the rate of stem fill, subsidence of femoral stem, periprosthetic radiolucent line, bone ingrowth, stress shielding, and osteolysis.Results The incidence of intraoperative femoral fracture was 5.8%; All incisions are healed; There were no cases of hip dislocation and revision; the rate of thigh pain was 5.8%, no patient had thigh pain after 1 year postoperatively; The mean preoperative Harris hip score was 48 points, which improved to a mean of 96 points at the time of the final follow-up. Postoperative X-ray showed that all patients have a satisfactory femoral fill in both planes; All of the femoral stems components were well-fixed at the time of final follow-up; 5(9.6%) femoral stems observed subsidence, but the subsidence of stem all were < 2 mm; The stress shielding phenomenon occurred in all patients, including first-degree in 31 hips, 2nd-degree in 19 hips, 3rd-degree in 2 hips, and none of 4th-degrees of stress shielding.Conclusion Ribbed stem with a rational design can be achieved satisfactory clinical outcomes and radiographic results. The design principles can be applied to current practice.