Loris Perticarini1, Mario Mosconi1, Marta Medetti1,2, Laura Caliogna1,3, Francesco M Benazzo1. 1. 1 Orthopaedic and Traumatology, Fondazione IRCCS Policlinico San Matteo, Pavia, Italy. 2. 2 Department of Clinical-Surgical Sciences, University of Pavia, Italy. 3. 3 Department of Clinical-Surgical Sciences, Diagnostics and Paediatrics, University of Pavia, Italy.
Abstract
BACKGROUND: : The new double-conical tapered stem is a novel cementless modular system, which is indicated for both primary and revision surgeries. It has been designed with different angles at the proximal (5°) and distal sections (1° 36') in order to obtain optimal fixation by proximal and distal fit and fill of the femoral canal. AIM:: The aim of this prospective study was to evaluate the short-term clinical and radiographic outcomes of primary and revision hip surgery with the new double-conical stem. METHODS: : 61 stems were implanted (December 2013 to September 2016) in 42 cases of primary and in 19 cases of revision surgery. The mean age of patients was 64.7 (17-94; standard deviation [SD] 21.9) years. RESULTS: : The mean body mass index of the patients was 24.6 (17-34.6). In 3 cases of developmental dysplasia of the hip we performed femoral shortening osteotomy. The mean follow-up was 26 (8-40) months. 3 patients died due to causes unrelated to surgery. Postoperative complications included 3 hip dislocations, 2 infections and 1 case of stem explant for metastatic tumour. For all other cases, at the last follow-up radiographs showed no loosening, no radiolucent lines nor subsidence. The mean Harris Hip Score significantly improved from 45 (range 35-58) preoperatively to 87 (range 75-94). Leg length discrepancy was found in 10% of cases but never >1 cm. CONCLUSIONS: : Radiographic analysis showed the bone-stem contact full at 2 levels of taper. The double-tapered prosthetic stem can therefore be usefully employed both in primary and in revision surgeries.
BACKGROUND: : The new double-conical tapered stem is a novel cementless modular system, which is indicated for both primary and revision surgeries. It has been designed with different angles at the proximal (5°) and distal sections (1° 36') in order to obtain optimal fixation by proximal and distal fit and fill of the femoral canal. AIM:: The aim of this prospective study was to evaluate the short-term clinical and radiographic outcomes of primary and revision hip surgery with the new double-conical stem. METHODS: : 61 stems were implanted (December 2013 to September 2016) in 42 cases of primary and in 19 cases of revision surgery. The mean age of patients was 64.7 (17-94; standard deviation [SD] 21.9) years. RESULTS: : The mean body mass index of the patients was 24.6 (17-34.6). In 3 cases of developmental dysplasia of the hip we performed femoral shortening osteotomy. The mean follow-up was 26 (8-40) months. 3 patients died due to causes unrelated to surgery. Postoperative complications included 3 hip dislocations, 2 infections and 1 case of stem explant for metastatic tumour. For all other cases, at the last follow-up radiographs showed no loosening, no radiolucent lines nor subsidence. The mean Harris Hip Score significantly improved from 45 (range 35-58) preoperatively to 87 (range 75-94). Leg length discrepancy was found in 10% of cases but never >1 cm. CONCLUSIONS: : Radiographic analysis showed the bone-stem contact full at 2 levels of taper. The double-tapered prosthetic stem can therefore be usefully employed both in primary and in revision surgeries.
Entities:
Keywords:
Conical stem; DDH; double-tapered stem; modular implant; revision hip