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- W2187467936 abstract "Purpose of the study: Two principle angles describe the orientation of the acetabular reconstruction of hip arthroplsty: lateral inclination and anteversion. Lateal inclination is easily determined on the plain x-ray but the measurement of anteversion generally requires axial computed tomography (CT). The values measured for acetabular anteversion depend on the planes chosen as reference. Similarly the measurement of acetabular inclination using conventional radiographs is often considered imprecise due to the large number of variables involved. Several reference planes are described in the literature. The purpose of this work was to characterise the values obtained using two reference planes, the anterior pelvic plan (APP) used for navigation and the pelvic axis (proposed by other authors).Materials and Methods: We used the Hip-Plane-Sympios® software to determine lateral inclination and anteversions using each reference plane. The APP was defined by three points: the anterosuperior border of the pubic symphysis, the anterior border of the two antero-superior iliac spines. The pelvic axis was defined by three points: the centre of the S1 plateau and the centres of the two femoral heads. A control reference plane (the plane of the CT table which corresponds to the conventional radiographic plane) was also used. Seventy-six patients scheduled for total hip arthroplasty for osteoarthritis were included in this protocol.Results: Values measured for the APP were: mean acetabular inclination 52.5°± 4.1° (40–62°), mean acetabular anteversion 24.1°±5.8° (14–35°). Values measured for the pelvic axis were: mean acetabular inclination 47.6°± 4.5° (37–59°), mean acetabular anteversion 12.9°±7° (2–31°). In the plane of the CT table: mean acetabular inclination was 50.6°±4.2° (38–57°) and mean acetabular anteversion 20.2°±702° (1–40°). All of these values were significantly different from the others (p<0.001). Use of the APP yields values higher than conventional values and those obtained using the pelvic axis, yet the distributions remained identical.Discussion: The APP is used for total hip arthroplasty navigation systems. It is important to recognised that the angles measured in reference to this plane are greater than the classical radiographic values measured for acetabular inclination. The pelvic plane produces angles closer to the generally accepted anatomic values. Angles measured relative to the radiographic table are intermediary." @default.
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- W2187467936 date "2010-05-01" @default.
- W2187467936 modified "2023-10-06" @default.
- W2187467936 title "COMPUTED TOMOGRAPHY MEASUREMENT OF ACETABULAR ANGLES USING DIFFERENT PELVIC REFERENCE PLANES" @default.
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