Measurement accuracy in acetabular cup wear. Three retrospective methods compared with Roentgen stereophotogrammetry.
The accuracy of three methods (the simple and noncomputerized Scheier-Sandel and Charnley-Duo methods and the computerized Ein Bild Roentgen Analyse [EBRA] method) for retrospective wear measurements of the acetabular cup from standard pelvis radiographs was studied. Measurements on 13 hip prostheses were compared with those obtained by roentgen stereophotogrammetry analysis. The Scheier-Sandel method had the lowest accuracy and the EBRA method had the best accuracy. The Charnley-Duo method was almost as good when starting analysis 3 months after surgery and is easier to use. The EBRA method is useful for accurate measurements on a small number of patients; the Charnley-Duo method is recommended for clinical wear studies on a larger number of patients.
Ilchmann
T
T
Lund University Hospital, Sweden.
Mjöberg
B
B
Wingstrand
H
H
D000077:Acetabulum; D001696:Biomechanical Phenomena; D006621:Hip Joint / Q000000981:diagnostic imaging*; D006622:Hip Prosthesis; D006801:Humans; D007091:Image Processing, Computer-Assisted; D010780:Photogrammetry; D011475:Prosthesis Failure; D011859:Radiography