The procedures were performed by 3 senior surgeons in a university hospital setting. The anterolateral approach, according to Bertin and Rottinger [2 (link)], was performed with the patient in the lateral position. The standard lateral transgluteal approach, according to Bauer [10 (link)], was performed with the patient in the supine position. The standardized peri- and postoperative protocol was identical in both groups, including single-shot antibiotics (Cefuroxime 1,5 g i.v. perioperatively), weight-bearing as tolerated, diclofenac 75 mg daily for the prevention of heterotopic ossification for four weeks and low-molecular weight heparin for six weeks postoperatively as prophylaxis for deep vein thrombosis.
As implants, a cementless tapered titanium straight stem (CLS Spotorno, Zimmer Inc., Warsaw, USA) and a cementless titanium press-fit cup with or without screws (Allofit®/-S, Zimmer Inc., Warsaw, USA) was used in all patients. Femoral implants were available with 3 different neck-shaft angles of 125, 135 and 145 °. In both groups, surgeons aimed for secure press-fit fixation, equal leg length, reconstruction of the preoperative hip offset, neutral stem alignment, cup inclination between 30–50° and cup anteversion between 10–30°. Preoperative planning of the prosthesis size and position was performed on radiographic ap pelvis templates in all cases.
As implants, a cementless tapered titanium straight stem (CLS Spotorno, Zimmer Inc., Warsaw, USA) and a cementless titanium press-fit cup with or without screws (Allofit®/-S, Zimmer Inc., Warsaw, USA) was used in all patients. Femoral implants were available with 3 different neck-shaft angles of 125, 135 and 145 °. In both groups, surgeons aimed for secure press-fit fixation, equal leg length, reconstruction of the preoperative hip offset, neutral stem alignment, cup inclination between 30–50° and cup anteversion between 10–30°. Preoperative planning of the prosthesis size and position was performed on radiographic ap pelvis templates in all cases.