caa a22 4500 463178769 CHVBK 20180406164832.0 cr unu---uuuuu 170326e20071201xx s 000 0 eng 10.1007/s10278-006-1042-5 doi (NATIONALLICENCE)springer-10.1007/s10278-006-1042-5 Comparison of Techniques for Correction of Magnification of Pelvic X-rays for Hip Surgery Planning [Elektronische Daten] [Bertram The, Johan Kootstra, Anton Hosman, Nico Verdonschot, Carina Gerritsma, Ron Diercks] The aim of this study was to develop an accurate method for correction of magnification of pelvic x-rays to enhance accuracy of hip surgery planning. All investigated methods aim at estimating the anteroposterior location of the hip joint in supine position to correctly position a reference object for correction of magnification. An existing method—which is currently being used in clinical practice in our clinics—is based on estimating the position of the hip joint by palpation of the greater trochanter. It is only moderately accurate and difficult to execute reliably in clinical practice. To develop a new method, 99 patients who already had a hip implant in situ were included; this enabled determining the true location of the hip joint deducted from the magnification of the prosthesis. Physical examination was used to obtain predictor variables possibly associated with the height of the hip joint. This included a simple dynamic hip joint examination to estimate the position of the center of rotation. Prediction equations were then constructed using regression analysis. The performance of these prediction equations was compared with the performance of the existing protocol. The mean absolute error in predicting the height of the hip joint center using the old method was 20mm (range −79mm to +46mm). This was 11mm for the new method (−32mm to +39mm). The prediction equation is: height (mm) = 34 + 1/2 abdominal circumference (cm). The newly developed prediction equation is a superior method for predicting the height of the hip joint center for correction of magnification of pelvic x-rays. We recommend its implementation in the departments of radiology and orthopedic surgery. SCAR (Society for Computer Applications in Radiology), 2007 Pelvic x-rays nationallicence hip joint nationallicence hip surgery planning nationallicence The Bertram Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut Kootstra Johan Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut Hosman Anton Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut Verdonschot Nico Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut Gerritsma Carina Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut Diercks Ron Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut Journal of Digital Imaging Springer-Verlag; http://www.springer-ny.com 20/4(2007-12-01), 329-335 0897-1889 20:4<329 2007 20 10278 https://doi.org/10.1007/s10278-006-1042-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10278-006-1042-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- The Bertram Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut NATIONALLICENCE 700 1- Kootstra Johan Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut NATIONALLICENCE 700 1- Hosman Anton Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut NATIONALLICENCE 700 1- Verdonschot Nico Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut NATIONALLICENCE 700 1- Gerritsma Carina Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut NATIONALLICENCE 700 1- Diercks Ron Department of Orthopedic Surgery, University Medical Center Groningen, Hanzeplein 1, 9700 RB, Groningen, The Netherlands aut NATIONALLICENCE 773 0- Journal of Digital Imaging Springer-Verlag; http://www.springer-ny.com 20/4(2007-12-01), 329-335 0897-1889 20:4<329 2007 20 10278 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer