title: Comparison of two- and three-dimensional methods for assessment of orientation of the total hip prosthesis.
abstract: A comparison of two- and three-dimensional methods for the determination of the orientation of total hip prostheses was made in a group of 57 patients. The acetabular inclination and the collum-diaphyseal angle measured on a.p. projections (2-D) were adequate in most cases for assessing how vertically the prosthetic component was inserted, but in individual cases with a high degree of version these measurements could be misleading. Anteversion measured in the transverse plane (2-D) was more sensitive to errors than planar anteversion measured as a rotation around the longest diameter of the ellipsoid projection of the acetabular opening, but it gave a rough estimate of the relation of the prosthetic components. Determination of the spatial (3-D) orientation of the components provides a precise estimate of the component relations.
authors.affiliation: Department of Diagnostic Radiology, University Hospital, Lund, Sweden.
authors.forename: K
authors.initials: K
authors.lastname: Herrlin
authors.forename: H
authors.initials: H
authors.lastname: Pettersson
authors.forename: G
authors.initials: G
authors.lastname: Selvik
mesh_terms: D000077:Acetabulum / Q000000981:diagnostic imaging; D001175:Arthrography / Q000379:methods*; D004868:Equipment Failure; D005269:Femur / Q000000981:diagnostic imaging; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis; D006801:Humans; D012399:Rotation