Model studies on acetabular component migration in total hip arthroplasty using CT and a semiautomated program for volume merging
2003 (English)In: Acta Radiologica, ISSN 0284-1851, E-ISSN 1600-0455, Vol. 44, no 4, 419-429 p.Article in journal (Refereed) Published
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 distributed and not dependent on observer. Conclusion: The accuracy of this non-invasive method out-performs routine plain radiography. The method gives both visual and numerical correlates to migration and can be used in clinical practice.
Place, publisher, year, edition, pages
2003. Vol. 44, no 4, 419-429 p.
hip prosthesis, volume merging, migration, CT, experimental, radiostereometry, accuracy
Orthopedics Radiology, Nuclear Medicine and Medical Imaging
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-22644DOI: 10.1034/j.1600-0455.2003.00086.xISI: 000183962100012OAI: oai:DiVA.org:kth-22644DiVA: diva2:341342
QC 20100525 NR 201408042010-08-102010-08-102013-09-09Bibliographically approved