B-0786 Evaluation of a new method for the assessment of anterior acetabular coverage and hip joint space narrowing

R. Ferré, E. Gibon, A. Feydy, H. Guerini, R. Campana, N. Zee, C. Bourdet, M. Hammadouche, J.-l. Drapé | Monday, March 11, 10:30 – 12:00 / Room E1

Purpose: The Lequesne’s false profile (LFP) view is commonly used to evaluate hip joint space narrowing (JSN) and anterior acetabular coverage using the vertical-center-anterior margin (VCA) angle. A novel low-dose biplanar slot scanner (SS) allows simultaneous acquisitions of weight-bearing oblique views of both hip joints. The aim was to compare LFP views versus biplanar oblique views obtained by SS.
Methods and Materials: LFP views were obtained on 56 hips on a computed radiography system. On the same hips, simultaneous oblique views of both hips were acquired in the SS, with the patient’s pelvis positioned at 45° from each acquisition plane. Two independent observers measured VCA angle and JSN on each acquisition. JSN was evaluated through the joint space/femoral head diameter ratio. Measurements from both techniques were compared using the student t-test and the Pearson’s correlation coefficient. Interobserver agreement of VCA angle and JSN assessments were calculated with the intraclass correlation coefficient (ICC).
Results: VCA angle was 33.5° (SD = 6.2°) with SS and 35° (5.6°) with LFP views (p<0.05). Pearson correlation coefficient between two techniques was 0.78 (p<0.01). JSN was 0,114 (SD = 0.03°) with SS and 0.108 (SD = 0.03°) with LFP views (p<0.05). Pearson correlation coefficient was 0.85 (p<0.01). ICCs for VCA angle were 0.91 with SS and 0.69 with LFP views. ICCs for JSN evaluation were 0.76 for both SS and LFP views.
Conclusion: SS is a reliable, easy, and low-dose evaluation of JSN and VCA angle despite a slight angular positioning compared with LFP.

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