TY - JOUR
T1 - Correlation between radiographic measures of acetabular morphology with 3D femoral head coverage in patients with acetabular retroversion
AU - Hansen, Benjamin J.
AU - Harris, Michael D.
AU - Anderson, Lucas A.
AU - Peters, Christopher L.
AU - Weiss, Jeffrey A.
AU - Anderson, Andrew E.
N1 - Funding Information:
BJH: designed the study, collected radiographic data, analyzed the radiographs, generated 3D reconstructions, and wrote the initial draft. MDH: collected CT data, generated and ensured the quality of 3-dimensional reconstructions, analyzed 3D data, and reviewed drafts. LAA: analyzed radio- graphic data, assisted in initial draft preparation, and reviewed subsequent drafts. JAW: assisted with study design, recruitment of patients, and preparation and revision of manuscript. CLP: diagnosed and treated patients, and ensured the quality of radiographic analyses. AEA: designed the study, performed statistical analyses, ensured the accuracy of the data collection and analysis, reviewed drafts of the manuscript, and was supervising author. We thank Mr Shawn Reese for assistance with software development. Statistical support from Ms Ashley Kapron and Dr Man Hung is gratefully acknowledged. The study was supported by funding from the National Institutes of Health (R01-AR053344) and the Sherman S. Coleman Resident Research Incentive Seed Grant of the University of Utah. The authors have no competing financial interests related to this study.
PY - 2012/6
Y1 - 2012/6
N2 - Background and purpose: Acetabular retroversion may result in anterior acetabular over-coverage and posterior deficiency. It is unclear how standard radiographic measures of retroversion relate to measurements from 3D models, generated from volumetric CT data. We sought to: (1) compare 2D radiographic measurements between patients with acetabular retroversion and normal control subjects, (2) compare 3D measurements of total and regional femoral head coverage between patients and controls, and (3) quantify relationships between radiographic measurements of acetabular retroversion to total and regional coverage of the femoral head. Patients and methods: For 16 patients and 18 controls we measured the extrusion index, crossover ratio, acetabular angle, acetabular index, lateral center edge angle, and a new measurement termed the "posterior wall distance". 3D femoral coverage was determined from volumetric CT data using objectively defined acetabular rim projections, head-neck junctions, and 4 anatomic regions. For radiographic measurements, intra-observer and inter-observer reliabilities were evaluated and associations between 2D radiographic and 3D model-based measures were determined. Results: Compared to control subjects, patients with acetabular retroversion had a negative posterior wall distance, increased extrusion index, and smaller lateral center edge angle. Differences in the acetabular index between groups approached statistical significance. The acetabular angle was similar between groups. Acetabular retroversion was associated with a slight but statistically significant increase in anterior acetabular coverage, especially in the anterolateral region. Retroverted hips had substantially less posterior coverage, especially in the posterolateral region. Interpretation: We found that a number of 2D radiographic measures of acetabular morphology were correlated with 3D model-based measures of total and regional femoral head coverage. These correlations may be used to assist in the diagnosis of retroversion and for preoperative planning.
AB - Background and purpose: Acetabular retroversion may result in anterior acetabular over-coverage and posterior deficiency. It is unclear how standard radiographic measures of retroversion relate to measurements from 3D models, generated from volumetric CT data. We sought to: (1) compare 2D radiographic measurements between patients with acetabular retroversion and normal control subjects, (2) compare 3D measurements of total and regional femoral head coverage between patients and controls, and (3) quantify relationships between radiographic measurements of acetabular retroversion to total and regional coverage of the femoral head. Patients and methods: For 16 patients and 18 controls we measured the extrusion index, crossover ratio, acetabular angle, acetabular index, lateral center edge angle, and a new measurement termed the "posterior wall distance". 3D femoral coverage was determined from volumetric CT data using objectively defined acetabular rim projections, head-neck junctions, and 4 anatomic regions. For radiographic measurements, intra-observer and inter-observer reliabilities were evaluated and associations between 2D radiographic and 3D model-based measures were determined. Results: Compared to control subjects, patients with acetabular retroversion had a negative posterior wall distance, increased extrusion index, and smaller lateral center edge angle. Differences in the acetabular index between groups approached statistical significance. The acetabular angle was similar between groups. Acetabular retroversion was associated with a slight but statistically significant increase in anterior acetabular coverage, especially in the anterolateral region. Retroverted hips had substantially less posterior coverage, especially in the posterolateral region. Interpretation: We found that a number of 2D radiographic measures of acetabular morphology were correlated with 3D model-based measures of total and regional femoral head coverage. These correlations may be used to assist in the diagnosis of retroversion and for preoperative planning.
UR - https://www.scopus.com/pages/publications/84861913625
U2 - 10.3109/17453674.2012.684138
DO - 10.3109/17453674.2012.684138
M3 - Article
C2 - 22553905
AN - SCOPUS:84861913625
SN - 1745-3674
VL - 83
SP - 233
EP - 239
JO - Acta orthopaedica
JF - Acta orthopaedica
IS - 3
ER -