Abstract
Introduction
The cement mantle thickness for cemented stem during total hip arthroplasty (THA) is different between the complete cement mantle technique and the line-to-line technique. In the line-to-line technique, the size of the rasp is same as that of the stem. We performed THA in321 hipsof 289 patientsusing a new designed triple-tapered polished cemented stem. We investigated the short-term result of these 321 hips clinically and radiographically.
Materials and Methods
From February 2002 to December 2012, 321 THAs were performed in 289 patients with the use oftriple-tapered polished cemented stem (Trilliance). Of these, 306 hips in 274 patients who were followed over 6 months, were evaluated. All THAs were undergone with direct anterior approach in supine position. The third generation cementing technique was standardized. The mean age at surgery was 65.3 years and the mean follow-up period was 24.6 months. Clinical results were evaluated by Japanese Orthopaedic Association (JOA) hip score. Intra-postoperative complications were investigated. Radiographic examinations were performed to investigate the findings of stem loosening, stress shielding, radiolucent line, osteolysis, stem subsidence, stem alignmentand cementing grade on plain radiograph.
Results
The mean JOA hip score improved from 40.7 pointspreoperatively to 93.2 points at the final follow-up. As complication, 1 late onset deep infection, 2 postoperative dislocations and 1 intraoperative fracture occurred. The mean stem subsidence was 0.22mm at 6 months, 0.33mm at 1year, 0.42mm at 2 years, 0.48mm at 3 years, and 0.53mm at 4 years.
