Abstract
Introduction
Lequesne’s vertical-center-anterior margin (VCA) angle measured on the false profile view of the pelvis aims at quantifying the anterior acetabular coverage of the femoral head. The anterior delimitation of the acetabular roof is often defined on the false profile view but there are no data on its interrater reliability. Additionally, it is not known how pelvic tilt may influence this angle. Finally, the plane in which this angle is measured lies at an angle of 65° to the sagittal plane and we wondered if this angle would be transposable to the anterior acetabular coverage measured in the sagittal plane.
Methods
Eight hips from four cadaver pelvises were investigated by means of a total of 72 false profile views, each taken in defined pelvic inclinations at 5° increments ranging from −20° to +20°, and the VCA angle measured by three independent raters. A computed tomography (CT) of each hip was performed in a neutral pelvic tilt position and a sagittal 2D reconstruction calculated in order to measure anterior coverage in the sagittal plane. The interrater reliability of the VCA angles was assessed using the intra-class correlation coefficient (ICC). The dependence of the VCA angle on pelvic tilt was assessed by regression analysis. The Correlation between the VCA angle and anterior coverage in the sagittal plane of the CT was analyzed using a simple linear regression model.
Results
The interrater reliability for measurements of the VCA angle was almost perfect (ICC:0.97). Regression analysis showed that each degree of pelvic tilt was accompanied by a change of the VCA angle by a value of 0.63° (P < 0.001). A low correlation between the VCA angle measured in the false profile view and the anterior coverage in the sagittal plane was statistically not significant (r = 0.667, P = 0.06).
Conclusions
Lequesne’s VCA angle has an excellent interrater reliability and represents a reliable measure of acetabular dysplasia for comparisons with published data. Lequesne’s VCA angle is influenced by pelvic tilt in a linear manner. Performing the false profile view in a standing position may reduce the clinical relevance of this dependency on pelvic tilt. The correlation of Lequesne’s VCA angle to anterior acetabular coverage in the sagittal plane is low and therefore unsuitable to be transposed into the sagittal plane.
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References
Crockarell J Jr, Trousdale RT, Cabanela ME, Berry DJ (1999) Early experience and results with the periacetabular osteotomy. The Mayo Clinic experience. Clin Orthop Relat Res (363):45–53
Crockarell JR Jr, Trousdale RT, Guyton JL (2000) The anterior centre-edge angle. A cadaver study. J Bone Joint Surg Br 82(4):532–534. doi:10.1302/0301-620X.82B4.10063
Fabeck L, Farrokh D, Behets C, Delince P (2002) Anatomical and radiological correlation of Lequesne’s “false profile”. Surg Radiol Anat 24(3–4):212–216. doi:10.1007/s00276-002-0038-1
Ganz R, Klaue K, Vinh TS, Mast JW (1988) A new periacetabular osteotomy for the treatment of hip dysplasias. Technique and preliminary results. Clin Orthop Relat Res (232):26–36
Legaye J, Duval-Beaupere G, Hecquet J, Marty C (1998) Pelvic incidence: a fundamental pelvic parameter for three-dimensional regulation of spinal sagittal curves. Eur Spine J 7(2):99–103. doi:10.1007/s005860050038
Lequesne M, de Seze S (1961) False profile of the pelvis. A new radiographic incidence for the study of the hip. Its use in dysplasias and different coxopathies. Rev Rhum Mal Osteoartic 28:643–652
Milcan A, Yildiz A, Oztuna V, Eskandari MM, Sahin G, Kuyurtar F (2004) The anterior center edge angle: a study of 102 volunteers. Joint Bone Spine 71(3):221–223. doi:10.1016/S1297-319X(03)00121-0
Montgomery AA, Graham A, Evans PH, Fahey T (2002) Inter-rater agreement in the scoring of abstracts submitted to a primary care research conference. BMC Health Serv Res 2(1):8. doi:10.1186/1472-6963-2-8
Wiberg G (1939) Studies on dysplastic acetabula and congenital subluxation of the hip joint with special reference to the complication of osteoarthritis. Acta Chir Scand Suppl (83):1–130
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Zingg, P.O., Werner , C.M.L., Sukthankar, A. et al. The anterior center edge angle in Lequesne’s false profile view: interrater correlation, dependence on pelvic tilt and correlation to anterior acetabular coverage in the sagital plane. A cadaver study. Arch Orthop Trauma Surg 129, 787–791 (2009). https://doi.org/10.1007/s00402-008-0694-7
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DOI: https://doi.org/10.1007/s00402-008-0694-7