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Purpose: This study evaluated the clinical and radiologic results of total hip arthroplasty and bipolar hemiarthroplasty using collarless polished tapered femoral stem. Materials and Methods: We retrospectively reviewed the results of 33 patients who underwent THA and BHA using cemented CPT femoral stem from November 2006 to April 2009. The mean follow-up period was 33 months. The clinical results were evaluated with a Harris Hip Score (HSS), and radiographic results were assessed with cement grade, osteolysis, loosening, stress shielding and subsidence methods. Results: Mean HSS improved with 91 points. Postoperative cement grade was A in 14 cases, B in 14 cases, C1 in 5 cases and D in none. Aseptic loosening was not found, while focal radiolucency in zone 8 was found. 70% of stems showed grade 1 and 2 stress shielding according to Engh’s criteria. Subsidence of the femoral stem was less than 1 mm in 32 cases, and was 1.47 mm in another case. Ectopic ossification was observed in 13 cases, class I in 11 cases, and class II in 2 cases, using Brooker’s classification. Conclusion: This study showed the good clinical and radiographic results of THA and BHA with a cemented CPT femoral stem at the mid-term follow-up. However, a long-term follow-up study will be needed to evaluate the more precise clinical and radiographic outcomes.

Hip Arthroplasty Using Collarless Polished Tapered Stem -Minimum 2 Years Follow-up Results-