Abstract
Objectives
The purpose of this study was to compare the calculated angle of lateral opening (ALO)
and open-face version obtained using an acetabular cup position assessment device
(CPAD) to the known ALO and open-face version of an acetabular component. The null
hypothesis was that there would be no significant differences between the ALO and
open-face versions using the CPAD compared with the known values.
Methods
Radiographic images simulating a sagittal plane pelvis were obtained with a BFX™ acetabular
component containing a CPAD mounted on a plexiglass jig with a dual-plane inclinometer.
Images were obtained at an open-face version of 0 degrees with ALO at 30, 40, 45,
50, and 60 degrees, repeated in triplicate, and were randomized. Measurements of the
CPAD bars were used to calculate the open-face version, and ALO measurements were
compared using a paired t-test with a p-value set at p < 0.05. Agreement was assessed with a Lin's Concordance Correlation Coefficient.
Results
The calculated ALO was not significantly different from the known ALO (p = 0.608) and showed near-perfect correlation of the ALO with a Lin's Concordance
Correlation Coefficient (R
c value) of 0.994. The calculated open-face version was significantly different from
the known version.
Conclusion
The results demonstrate that the CPAD is an accurate method to determine ALO in a
simulated sagittal plane pelvis radiographic view.
Keywords
total hip arthroplasty - acetabular component - angle of lateral opening - cup position
assessment device - version
