High-precision measurements of cementless acetabular components using model-based RSA: an experimental study.
Background In RSA, tantalum markers attached to metal-backed acetabular cups are often difficult to detect on stereo radiographs due to the high density of the metal shell. This results in occlusion of the prosthesis markers and may lead to inconclusive migration results. Within the last few years,...
| Publicado en: | Acta Orthopaedica Vol. 78; no. 4; pp. 463 - 470 |
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| Autores principales: | , , , |
| Formato: | Journal Article |
| Publicado: |
Medical Journals Sweden AB
Aug2007
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| Acceso en línea: | Ver este registro en EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=105818386&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 105818386 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 17453674 1BVL jtl: Acta Orthopaedica issn: 17453674 maglogo: N pubinfo: dt: Aug2007 vid: 78 iid: 4 pid: 59195 pub: Medical Journals Sweden AB artinfo: ui: 105818386 2009702959 NLM17965999 105818386 ppf: 463 ppct: 7 formats: fmt: @attributes: type: P tig: atl: High-precision measurements of cementless acetabular components using model-based RSA: an experimental study. aug: au: Baad-Hansen T Kold S Kaptein BL Søballe K affil: Departments of Orthopaedic Surgery, Aarhus University Hospital, Denmark. sug: subj: Acetabulum Physiopathology Acetabulum Radiography Acetabulum Surgery Arthroplasty, Replacement, Hip Photography Methods Biomechanics Cementation Joint Prosthesis Models, Biological Software ab: Background In RSA, tantalum markers attached to metal-backed acetabular cups are often difficult to detect on stereo radiographs due to the high density of the metal shell. This results in occlusion of the prosthesis markers and may lead to inconclusive migration results. Within the last few years, new software systems have been developed to solve this problem. We compared the precision of 3 RSA systems in migration analysis of the acetabular component. Material and methods A hemispherical and a nonhemispherical acetabular component were mounted in a phantom. Both acetabular components underwent migration analyses with 3 different RSA systems: conventional RSA using tantalum markers, an RSA system using a hemispherical cup algorithm, and a novel modelbased RSA system. Results We found narrow confidence intervals, indicating high precision of the conventional marker system and model-based RSA with regard to migration and rotation. The confidence intervals of conventional RSA and model-based RSA were narrower than those of the hemispherical cup algorithm-based system regarding cup migration and rotation. Interpretation The model-based RSA software combines the precision of the conventional RSA software with the convenience of the hemispherical cup algo-rithm-based system. Based on our findings, we believe that these new tools offer an improvement in the measurement of acetabular component migration. pubtype: Academic Journal doctype: Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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