Radiostereometric analysis at Biomatlab
Radiostereometric Analysis (RSA)
X-ray showing a Persona TKA implant (Zimmer Biomet) with tantalum bead markers, necessary for the RSA measurement of migration and rotation
Photo:
Sindre Zachariassen (copyright owner, KiH) on behalf of Irene O. Moldestad for Biomatlab-Helse Bergen
Main content
Biomatlab is responsible for the analysis of x-rays聽in several clinical trials of hip- and knee prostheses, using Radiostereometric Analysis (RSA).
- The Persona vs. NextGen RSA knee-study is underway at Kysthopitalet i聽Hagevik聽and at Sjukehuset i聽L忙rdal (project started 2017).
- Total hip replacements study: RSA and DXA 60 patients with Polar-stems versus Corail-stems. A randomized clinical trial with five year follow-up. Organised by Orthopedic clinic at Haukeland University Hosptal (project started聽2016)
- A comparative randomized study of 5 articulations in total hip replacements - 10 years of follow up with RSA, metal ion levels in blood, CT and MRI scans.聽Organised by Orthopedic clinic at Haukeland University Hosptal
The software we use is UmRSA from (鲍尘别氓).听
About the method:
鈥SA is a highly accurate and precise method of evaluating e.g. implant migration and polyethylene聽wear.
鈥he聽precision usually is about 0.1mm (translational migration) and 0.1 degrees (rotation).聽
鈥ostoperatively, two simultaneous exposures of the knee and a co-ordinate system are taken.聽This pair of聽x-rays allow聽3D-definition聽of the implant and bone relative to the co-ordinate system. Implant migration and rotation are measured on repeat examinations over time.
30.03.2020