title: The aspherical human hip: implication for early osteoarthritis.
abstract: One marker for early-onset hip arthritis is femoral acetabular impingement. The current standard way of quantifying impingement is manual calculation of anatomical measures on plain radiographs, including the α-angle. Such measurements are user-dependent and prone to error. We provided a robust computational alternative and proposed using numerical fitting of geometrical shapes. We applied least-squares fitting of an ellipse to the femoral head contour and used the difference between the ellipse axes as a quantification method. The results showed a good correlation between the new measure and previous definitions of the α-angle.
authors: School of Computing, Queen's University, Kingston, Ontario, Canada.
authors: Mohamed S
authors: MS
authors: Hefny
authors: Andrew W L
authors: AW
authors: Dickinson
authors: Andrew E
authors: AE
authors: Giles
authors: Gavin C A
authors: GC
authors: Wood
authors: Randy E
authors: RE
authors: Ellis
mesh_terms: D001175:Arthrography / Q000379:methods*; D042241:Early Diagnosis; D057925:Femoracetabular Impingement / Q000150:complications* / Q000000981:diagnostic imaging*; D006801:Humans; D015207:Osteoarthritis, Hip / Q000000981:diagnostic imaging* / Q000209:etiology*; D011857:Radiographic Image Interpretation, Computer-Assisted / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D014057:Tomography, X-Ray Computed / Q000379:methods*