Model Studies on Acetabular Component Migration in Total Hip Arthroplasty using Ct and a Semiautomated Program for Volume Merging
| Autor: | Lotta Olivecrona, Henrik Olivecrona, Gerald Q. Maguire Jr., Lars Weidenhielm, Marilyn E. Noz, Michael P. Zeleznik |
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| Rok vydání: | 2003 |
| Předmět: |
medicine.medical_specialty
Radiological and Ultrasound Technology business.industry Mean absolute error General Medicine Repeatability Imaging phantom Acetabular component Orthopedic surgery Medicine Radiology Nuclear Medicine and imaging Radiology business Ct measurements Total hip arthroplasty Volume (compression) |
| Zdroj: | Acta Radiologica. 44:419-429 |
| ISSN: | 1600-0455 0284-1851 |
| Popis: | Purpose: Validation of a non-invasive CT method for detection of acetabular cup migration after total hip arthroplasty in a phantom study. Material and Methods: 26 CT examinations were obtained of a pelvic model while altering the position of the acetabular cup. Using a previously described program for volume merging, the pelvi in different examinations were fused and the 3D alterations of the position of the acetabular cup were evaluated visually and numerically and correlated to direct measurements on the model. Results: Visually, two independent examiners differentiated between 0, 1 and 2 to 3 mm migration with 100% specificity and sensitivity. Numerically, the mean error over all cases between model and CT measurements was 0.04 mm (SD ± 0.33). The mean absolute error between model and CT data was 0.26 mm (SD ± 0.19). Intra- and interobserver 95% accuracy and repeatability limits were below 0.5/0.7 mm, respectively. No significant interobserver difference occurred. The data were normally di... |
| Databáze: | OpenAIRE |
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