Title Accuracy of predictive magnification factor for preoperative templating in total hip arthroplasty /
Authors Masionis, Povilas ; Karneckas, Martynas ; Uvarovas, Valentinas ; Jonušas, Justinas ; Porvaneckas, Narūnas
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Is Part of MedCrave Online Journal of Orthopaedics & Rheumatology (MOJOR).. Edmond : MedCrave. 2018, Vol. 10, no 2, p. 100-102.. ISSN 2374-6939
Keywords [eng] hip arthroplasty ; digital templating ; PACS
Abstract [eng] The purpose of the present study was to evaluate the accuracy of predicted magnification factor (MF) for preoperative digital templating before THA in our institution. A retrospective review of postoperative radiographs of individuals who received primary THA was conducted. The final sample included 531 patients with a mean age 66±12 years, 221 of them were males (mean age 62 ± 12 years) and 310 – females (mean age 68±11 years). The biggest diameter of acetabular component in postoperative radiographs was measured twice at a one-month interval by observers. The measurements were made under MF of 0 %. The predictive MF of 15 % is used at our institution. True MF was calculated as the measured size of acetabular component divided by the actual size multiplied by 100. The accuracy of the predictive MF was calculated as the predictive MF divided by true MF multiplied by 100. The intra-observer ICC 0.93±0.01 and inter-observer 0.95±0.02 agreement was excellent. The mean true MF was 15.51% and accuracy of the predictive MF was 77.23%. After the split by gender, the mean true MF was 15.84%, accuracy of the predictive MF was 77.97% in males and 15.28%, 76.71% in females, respectively. The predictive MF factor appeared to have too low accuracy for modern templating. We recommend assessing the true MF in hospitals where digital templating is routinely used for THA and consider using calibration markers in order to increase the accuracy of preoperative planning.
Published Edmond : MedCrave
Type Journal article
Language English
Publication date 2018