Acetabular component migration in total hip arthroplasty using CT and a semiautomated program for volume merging
2002 (English)In: Acta Radiologica, ISSN 0284-1851, E-ISSN 1600-0455, Vol. 43, no 5, 517-527 p.Article in journal (Refereed) Published
Purpose: To develop a non-invasive method for detection of acetabular cup migration after total hip arthroplasty (THA) with a higher degree of accuracy than routine plain radiography. Material and Methods: Two CT examinations, 10 min apart, were obtained from each of 10 patients that had undergone THA. Using an in-house developed semiautomated program for volume merging, the pelves in the two examinations were fused and the acetabular cup was visually and numerically evaluated to test the method's accuracy in detecting migration. Results: In the visual evaluation of the best match a 1-mm translation of the cup was detectable. The numerical evaluation, comparing landmarks placed in the images of the acetabular cup and the head of the femur component in the two examinations, showed the mean difference in orientation of acetabular axes to be 2.5degrees, the mean distance between centre of cup face to be 2.5 mm and the mean distance between centre of the head of the prosthetic femoral component to be 1 mm. Conclusion: This method has a significantly higher accuracy than routine plain radiography in detecting acetabular cup migration and could be used in clinical practice. It gives both a visual and a numerical correlate to migration.
Place, publisher, year, edition, pages
2002. Vol. 43, no 5, 517-527 p.
hip prosthesis, volume merging, CT, experimental, medical image registration, fusion
Radiology, Nuclear Medicine and Medical Imaging Orthopedics
Research subject SRA - ICT
IdentifiersURN: urn:nbn:se:kth:diva-22071DOI: 10.1034/j.1600-0455.2002.430513.xISI: 000179450300013OAI: oai:DiVA.org:kth-22071DiVA: diva2:340769
QC 20100525 NR 201408042010-08-102010-08-102013-09-09Bibliographically approved