Precision of low-dose CT-based micromotion analysis technique for the assessment of early acetabular cup migration compared with gold standard RSA: a prospective study of 30 patients up to 1 year

Authors

  • Vasileios Angelomenos Department of Orthopedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg; Department of Orthopedics, Sahlgrenska University Hospital, Gothenburg, Sweden https://orcid.org/0000-0001-9207-221X
  • Maziar Mohaddes Department of Orthopedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg; Department of Orthopedics, Sahlgrenska University Hospital, Gothenburg, Sweden
  • Raed Itayem Department of Orthopedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg; Department of Orthopedics, Sahlgrenska University Hospital, Gothenburg, Sweden
  • Bita Shareghi Department of Orthopedics, Institute of Clinical Sciences, Sahlgrenska Academy, University of Gothenburg, Gothenburg; Department of Orthopedics, Sahlgrenska University Hospital, Gothenburg, Sweden

DOI:

https://doi.org/10.2340/17453674.2022.2528

Keywords:

Arthroplasty, Computed Tomography Micromotion Analysis, CT, CTMA, Hip, Implants, Osteoarthrosis, Pelvis and acetabulum, Radiostereometric Analysis, RSA

Abstract

Background and purpose: Computed tomography micromotion analysis (CTMA) can be used to determine implant micro-movements using low-dose CT scans. By using CTMA, a non-invasive measurement of joint implant movement is enabled. We evaluated the precision of CTMA in measuring early cup migration. Standard marker-based radiostereometric analysis (RSA) was used as reference. We hypothesised that CTMA can be used as an alternative to RSA in assessing implant micromotions.
Patients and methods: We included 30 patients undergoing total hip arthroplasty (THA). Acetabular cup migration at 1 year was measured with RSA and CTMA. To determine the precision of both methods, 20 double examinations (postoperatively) with repositioning of the patients were performed. The precision was calculated from zero by assuming that there was no motion of the prosthesis between the 2 examinations.
Results: The precision of RSA ranged from 0.06 to 0.15 mm for translations and 0.21° to 0.63° for rotations. Corresponding values for CTMA were 0.06 to 0.13 mm and 0.23° to 0.35°. A good level of agreement was found between the methods regarding cup migration and rotation at 1 year.
Interpretation: The precision of CTMA in measuring acetabular cup migration and rotation is comparable to marker-based RSA. CTMA could possibly thus be used as an alternative method to detect early implant migration.

Downloads

Download data is not yet available.

Published

2022-04-22

How to Cite

Angelomenos, V., Mohaddes, M., Itayem, R., & Shareghi, B. (2022). Precision of low-dose CT-based micromotion analysis technique for the assessment of early acetabular cup migration compared with gold standard RSA: a prospective study of 30 patients up to 1 year. Acta Orthopaedica, 93, 459–465. https://doi.org/10.2340/17453674.2022.2528

Issue

Section

Non-randomized clinical study

Most read articles by the same author(s)

1 2 > >>