Patients with abnormal spinopelvic mobility are at increased risk for instability. Measuring the change in sacral slope (ΔSS) can help determine spinopelvic mobility preoperatively. Sacral slope (SS) should decrease at least 10° to demonstrate adequate posterior pelvic tilt. There is potential for different ΔSS measurements in the same patient based on sitting posture. The purpose of this study was to determine the effect of sitting posture on the ΔSS in patients undergoing total hip arthroplasty (THA). In total, 51 patients undergoing THA were reviewed to quantify the variability in preoperative spinopelvic mobility when measuring two different sitting positions using SS for planning.Aims
Methods
The aims of this study were to measure sagittal standing and sitting lumbar-pelvic-femoral alignment in patients before and following total hip arthroplasty (THA), and to consider what preoperative factors may influence a change in postoperative pelvic position. A total of 161 patients were considered for inclusion. Patients had a mean age of the remaining 61 years (Aims
Patients and Methods
Aims. The primary aim of this study was to analyse the position of
the acetabular and femoral components in total hip arthroplasty
undertaken using an anterior surgical approach. . Patients and Methods. In a prospective, single centre study, we used the EOS imaging
system to analyse the position of components following THA performed
via the anterior approach in 102 patients (103 hips) with a mean
age of 64.7 years (. sd. 12.6). Images were taken with patients
in the standing position, allowing measurement of both anatomical
and functional anteversion of the acetabular component. . Results. The mean inclination of the acetabular component was 39° (standard
deviation (. sd). 6), the mean anatomical anteversion was
30° (. sd. 10), and the mean functional anteversion was 31°
(. sd. 8) five days after surgery. The mean anteversion of
the femoral component was 20° (. sd. 11). Anatomical and functional
anteversion of the acetabular component differed by >
10° in 23
(22%) cases. Pelvic tilt was the only pre-operative predictive factor
of this difference. Conclusion. Our study showed that anteversion of the acetabular component
following THA using the anterior approach was greater than the recommended
target value, and that substantial differences were observed in
some patients when measured using two different measurement planes.
If these results are confirmed by further studies, and considering
that the anterior approach is intended to limit the incidence of
dislocation, a new correlation study for each reference plane (anatomical
and functional) will be necessary to define a ‘safe zone’ for use
with the anterior approach. Take home message:
