A More Reliable Method to Assess Acetabular Component Position

作者：Tiberi John V^*; Pulos Nicholas; Kertzner Michael; Schmlazried Thomas P

来源：Clinical Orthopaedics and Related Research, 2012, 470(2): 471-476.

DOI：10.1007/s11999-011-2006-8

Acetabular component position is associated with joint function and bearing wear. Current techniques for determining acetabular component version on standard radiographs lack reliability. Other, more consistent techniques are time-consuming and require additional equipment or software.
We compared three methods of acetabular component position assessment: (1) Einzel-Bild-Roentgen-Analyse (EBRA), (2) Woo and Morrey, and (3) the new ischiolateral method.
We assessed axial component position for 52 hips, with at least three radiographic series, using EBRA, and on true lateral radiographs using the Woo and Morrey method and a new method that uses the ischium as a skeletal landmark, the ischiolateral method.
The mean SDs of the ischiolateral (2.15A degrees) and EBRA (2.06A degrees) methods were lower than that of the Woo and Morrey method (3.65A degrees) but were not different from one another. We observed a SD of greater than 4A degrees in 19 (36.5%) hip series using the Woo and Morrey method, compared to six series (11.5%) for both the ischiolateral and EBRA methods. Twenty-four (12.6%) Woo and Morrey measurements were greater than 4A degrees from the mean for the hip series, compared to seven (3.8%) for ischiolateral and nine (4.7%) for EBRA. The intraclass correlation coefficients for intra- and interobserver reliability for the ischiolateral method and EBRA were the same (0.9).
Referencing the ischium standardizes pelvic position on each lateral radiograph and provides a simple and reliable means to assess axial component position, which is a surrogate for the planar anteversion measured by EBRA.

• 出版日期2012-2