Normal values of Wiberg’s lateral center-edge angle and Lequesne’s acetabular index–a coxometric update
- 1.2k Downloads
The historical pathological cut-off values for Wiberg’s lateral center-edge (LCE) angle and Lequesne’s acetabular index (AI) are below 20° and above 12° for the LCE and AI, respectively. The aim of this study was to reassess these two angles more than 50 years after their introduction using a standardized conventional radiological measurement method, considering changing social habits and their associated physiological changes.
A total of 1,226 anteroposterior radiographs of the pelvis (2,452 hips) were obtained according to a strict standardized radiographic technique allowing reliable measurements of the LCE angle and the AI.
Distributions of the LCE and AI were pronouncedly Gaussian, with mean values of 33.6° for the LCE and 4.4° for the AI. The 2.5th and 97.5th empirical percentiles were 18.1 and 48.0° for the LCE and −6.9 and 14.9° for the AI. These intervals contained 95 % of the data in our large sample. Small but statistically significant differences between the sexes and right and left hips have been demonstrated. Correlation between age and coxometric indices was low.
The above findings do not conflict with the historical benchmarks. Statistical differences between sexes and between right and left hips were not clinically relevant. No conclusion can be drawn about coxometric indices and clinical manifestations of hip dysplasia.
KeywordsHip Acetabulum Lateral center-edge angle Acetabular index Pelvic radiographs
- 1.Wiberg G. Studies on dysplastic acetabula and congenital subluxation of the hip joint. Acta Chir Scand. 1939:5–135.Google Scholar
- 3.Ganz R, Klaue K, Vinh TS, Mast JW. A new periacetabular osteotomy for the treatment of hip dysplasias. Technique and preliminary results. Clin Orthop Relat Res. 1988:26–36.Google Scholar
- 7.Siebenrock KA, Kalbermatten DF, Ganz R. Effect of pelvic tilt on acetabular retroversion: a study of pelves from cadavers. Clin Orthop Relat Res. 2003:241–8.Google Scholar
- 8.Pinheiro J, Bates D, DebRoy S, Sarkar D, and the R Core Team. nlme: linear and nonlinear mixed effects models. 1–90.Google Scholar
- 9.RDevelopmentCoreTeam. R: language and environment for statistical computing. 2010.Google Scholar
- 10.Hilgenreiner H. Zur Frühdiagnose und Frühbehandlung der angeborenen Hüftgelenkverrenkung. Med Klinik 1925:1385–9.Google Scholar
- 11.Tonnis D. Normal values of the hip joint for the evaluation of X-rays in children and adults. Clin Orthop Relat Res. 1976:39–47.Google Scholar