Pelvis and total hip arthroplasty acetabular component orientations in sitting and standing positions: Measurements reproductibility with EOS imaging system versus conventional radiographies - 07/06/11
, M.A. Rousseau a, A. Rangel a, M. Gorin b, C. Belicourt a, A. Brusson a, Y. Catonné a
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Summary |
Introduction |
The literature has recently underlined the interest of pelvic and acetabular component orientation measurements in the standing and sitting position. Radiographic follow-up of total hip arthroplasty (THA) is based on standard AP and lateral X-rays. The use of EOS™ 2D imaging system reduces patient’s radiation exposure compared to conventional X-rays. However, using this system, the validity and reproducibility of angular measurements, have not been studied yet for the measurement of pelvic and acetabular parameters in patients with THA.
Hypothesis |
The EOS™ 2D imaging system offers similar advantages to conventional X-rays in the measurement of pelvic and acetabular orientation parameters which are commonly used.
Patients and method |
Five angular parameters characterizing pelvic tilt and acetabular cup orientation were determined using the same digital measurement Imagika™ software based on two series of standard X-rays and EOS™ 2D images acquired in both standing and sitting positions. Radiographs from 50 patients with unilateral THA were measured three times by two observers. Intra- and interobserver reproducibility using each method was independently studied then paired comparison was performed.
Results |
The ICC and Spearman rank correlation coefficient demonstrated an excellent EOS/conventional X-ray correlation. According to the parameters, the mean difference between these two imaging modalities ranged from 0.30° to 3.43° (P<0.05). The intra- and interobserver variability ranged from±2.97° to±6.46° using the EOS™ imaging system and from±4.26° to±10.22° using conventional X-rays (P<0.05).
Discussion |
The EOS™ 2D imaging system may replace conventional X-rays in the assessment and monitoring of pelvic and acetabular cup orientation in THA.
Level of evidence |
Level III. Prospective diagnostic study.
Le texte complet de cet article est disponible en PDF.Keywords : EOS measurements, Hip prosthesis, Total hip arthroplasty, Acetabulum, Cup, Pelvis orientation, Anterior pelvic plane
Plan
Vol 97 - N° 4
P. 373-380 - juin 2011 Retour au numéro
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