Background: Femoral stem anteversion during hip arthroplasty is generally estimated by eye intraoperatively and hasproven to be different from targeted values. This study aims to determine the accuracy of a novel technique using adigital protractor and a spirit level to improve surgeons’ estimation of stem anteversion.Methods: A prospective non-randomized study was conducted a...

The combined anteversion technique for acetabular component placement of total hip arthroplasty is beneficial because of the surgeons' limited ability to control the anteversion of a cementless femoral stem. Our data show that the cementless stem anteversion can be 15 degrees different than anticipated. By determining femoral stem anteversion before positioning cup anteversion, the cup antevers...

BACKROUND Improper femoral and acetabular component positioning can be associated with instability, impingement, component wear and finally patient dissatisfaction in total hip arthroplasty (THA). The concept of "femur first"/"combined anteversion", incorporates various aspects of performing a functional optimization of the prosthetic stem and cup position of the stem relative to the cup intrao...

INTRODUCTION: Cup and stem positioning correlates each other in total hip arthroplasty (THA), and it is believed that optimal combined anteversion (CA), which is a sum of cup and stem anteversion (AV) angle, is about 40° – 60°. However, there are few studies that have compared which adjustment is more effective, changing a cup or a femoral stem to optimizing CA and increasing ROM. In this study...

INTRODUCTION: Dislocation continues to be a common complication of total hip arthroplasty (THA), affecting 2% to 11% of primary cases. Many factors affect the prevalence of dislocation after THA, including soft tissue laxity, surgical approach, component position, patient factors, and component designs [1,2]. Many in vitro studies have reported the range of motion (ROM) of the hip, impingement,...

We report a case of impingement in a metal-on-metal total hip replacement causing both notching of the femoral stem neck and aseptic loosening of the acetabular component. The acetabular component was inserted in excessive anteversion. The femoral stem and acetabular components were retrieved. A larger femoral head was used, and an acetabular component was placed in a less anteverted position. ...

BACKGROUND The relevance of prosthetic component orientation to prevent dislocation and impingement following total hip arthroplasty (THA) has been widely accepted. We investigated the use of a non-computer-based surgery to address the reciprocal orientation of the acetabular and femoral components. METHODS In the femur first technique, the cup is positioned relative to the stem. When the def...

Background and purpose - In hip arthroplasty, acetabular inclination and anteversion-and also femoral stem torsion-are generally assessed by eye intraoperatively. We assessed whether visual estimation of cup and stem position is reliable. Patients and methods - In the course of a subgroup analysis of a prospective clinical trial, 65 patients underwent cementless hip arthroplasty using a minimal...

In recent literatures dealing with optimization of prosthetic alignment in total hip arthroplasty (THA), the concept of combined anteversion (CA), which is the sum of acetabular anteversion (AV) and femoral antetorsion (AT), has been addressed. Widmer attempted to determine the optimal CA using a computer simulation study . He proposed the “new safe zone” for the CA value to achieve essential r...