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Measurement of migration of a humeral head resurfacing prosthesis using radiostereometry without implant marking.

Introduction Standard radiostereometric analysis of prosthetic migration requires that tantalum beads are inserted into the implant. For manufacturing reasons, this is not possible for humeral head resurfacing implants. We therefore used marker-free radiostereometry, developed for metal-backed aceta...

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Published in:Acta Orthopaedica Vol. 82; no. 2; pp. 193 - 198
Main Authors: Skööldenberg, Olof, ÖÖdquist, Magnus
Format: equations & formulas pictorial research tables/charts Journal Article
Published: Medical Journals Sweden AB Apr2011
Online Access:View this record in EBSCOhost
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      dt: Apr2011
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      pub: Medical Journals Sweden AB
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        104862816
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        10.3109/17453674.2011.566133
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        atl: Measurement of migration of a humeral head resurfacing prosthesis using radiostereometry without implant marking.
      aug:
        au:
          Skööldenberg, Olof
          ÖÖdquist, Magnus
        affil: Karolinska Institutet, Department of Clinical Sciences at Danderyd Hospital, Stockholm, Sweden.
      sug:
        subj:
          Orthopedic Prosthesis
          Models, Anatomic
          Radiostereometric Analysis
          Experimental Studies
          Data Analysis Software
      ab: Introduction Standard radiostereometric analysis of prosthetic migration requires that tantalum beads are inserted into the implant. For manufacturing reasons, this is not possible for humeral head resurfacing implants. We therefore used marker-free radiostereometry, developed for metal-backed acetabular cups, on a dummy model to validate the method for a humeral head resurfacing prosthesis. Material and methods 3 hemispherical resurfacing prostheses of different sizes were marked with tantalum beads and mounted in a sawbone. Standard and marker-free radiostereometry was then done repeatedly with gradual shifts of position of the prosthesis between each analysis. The marker-free algorithm was then compared to the standard to determine the accuracy. Results The accuracy for marker-free radiostereometry was 0.22--0.47 mm for translations and 0.92--1.56 degrees for rotations. Interpretation Based on our results, marker-free radiostereometry can be used to measure migration of humeral head resurfacing prostheses. This indicates that implant marking is not required when doing radiostereometry on humeral head resurfacing in clinical trials.
      pubtype: Academic Journal
      doctype:
        equations & formulas
        pictorial
        research
        tables/charts
        Journal Article
      ougenre: Article
    language: English
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