Background. New generation short stem implants have some unquestionable advantages, which make them particularly attractive. However, in order to achieve good clinical results every implant must respect the normal joint anatomy and biomechanics. Objectives. To evaluate if these implants can fulfill the normal biomechanical parameters, such as femoral offset and leg length, and to assess the clinical outcome. Methods. The main radiographic parameters (horizontal and vertical rotation centre, femoral offset, leg length) have been evaluated in 147 patients who had a short stem implanted between July 2010 and July 2012 at the Private Hospital The Avenue in Melbourne, Australia. Patients have been clinically assessed with the Harris Hip Score and the WOMAC score preoperatively and at 3 months and at 1 year follow-up. Results. Restoration of the four main radiographic parameters was achieved within 5 mm of the contralateral side in most of our patients. Clinical results are excellent, as with the standard stems. Conclusions. With the Nanos® stem we can expect only minor and probably meaningless differences concerning the biomechanical parameters and the leg length; clinical results are comparable to the standard stems. Therefore, we believe the Nanos® stem to be a very useful implant for the total hip arthroplasty.
Radiographic assessment and clinical outcome after total hip arthroplasty with a Nanos® short stem prosthesis in 147 patients
GILDONE, Alessandro;CARUSO, Gaetano;MASSARI, Leo;
2014
Abstract
Background. New generation short stem implants have some unquestionable advantages, which make them particularly attractive. However, in order to achieve good clinical results every implant must respect the normal joint anatomy and biomechanics. Objectives. To evaluate if these implants can fulfill the normal biomechanical parameters, such as femoral offset and leg length, and to assess the clinical outcome. Methods. The main radiographic parameters (horizontal and vertical rotation centre, femoral offset, leg length) have been evaluated in 147 patients who had a short stem implanted between July 2010 and July 2012 at the Private Hospital The Avenue in Melbourne, Australia. Patients have been clinically assessed with the Harris Hip Score and the WOMAC score preoperatively and at 3 months and at 1 year follow-up. Results. Restoration of the four main radiographic parameters was achieved within 5 mm of the contralateral side in most of our patients. Clinical results are excellent, as with the standard stems. Conclusions. With the Nanos® stem we can expect only minor and probably meaningless differences concerning the biomechanical parameters and the leg length; clinical results are comparable to the standard stems. Therefore, we believe the Nanos® stem to be a very useful implant for the total hip arthroplasty.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.