Measurement of femoral head penetration in polyethylene using a 3-dimensional CT-scan technique.
Background Current techniques for measuring in vivo polyethylene wear suffer from a range of problems, resulting in an unacceptable lack of repeatability and/or insufficient accuracy when they are used to measure the low wear rates associated with new, highly crosslinked polyethylene. We describe an...
| Publicado en: | Acta Orthopaedica Vol. 81; no. 5; pp. 563 - 570 |
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| Autores principales: | , , , , , , |
| Formato: | diagnostic images research tables/charts Journal Article |
| Publicado: |
Medical Journals Sweden AB
Oct2010
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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=104928106&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 104928106 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 17453674 1BVL jtl: Acta Orthopaedica issn: 17453674 maglogo: N pubinfo: dt: Oct2010 vid: 81 iid: 5 pid: 59195 pub: Medical Journals Sweden AB artinfo: ui: 104928106 54301205 10.3109/17453674.2010.519163 104928106 ppf: 563 ppct: 7 formats: fmt: @attributes: type: P tig: atl: Measurement of femoral head penetration in polyethylene using a 3-dimensional CT-scan technique. aug: au: Vandenbussche E Saffarini M Hansen U Taillieu F Mutschler C Augereau B Gregory TM affil: Department of Orthopaedic Surgery, Université Paris Descartes, Assistance Publique - Hôpitaux de Paris, Hôpital Européen Georges Pompidou, Paris, France sug: subj: Prosthesis Failure Radiography Polyethylenes Tomography, X-Ray Computed Methods Arthroplasty, Replacement, Hip Femur Head Radiography Human Orthopedic Prosthesis Hip Joint Joint Prosthesis Acetabulum Radiography Interrater Reliability Repeated Measures Descriptive Statistics Intrarater Reliability Confidence Intervals ab: Background Current techniques for measuring in vivo polyethylene wear suffer from a range of problems, resulting in an unacceptable lack of repeatability and/or insufficient accuracy when they are used to measure the low wear rates associated with new, highly crosslinked polyethylene. We describe an improved CT method for measurement of 3D femoral head penetration in PE acetabular cups that has sufficient accuracy and repeatability to allow assessment of the wear potential of modern implants. Method The accuracy and repeatability of the CT-scan method was determined by blindly repeating measurements on a precisely calibrated 28-mm prosthetic head and by comparing them with direct metrological measurements on 10 acetabular specimens with in vitro wear from machining, and on 8 explanted acetabular specimens with in vivo wear. Results The intra- and interobserver errors in femoral head diameter were 0.036 mm (SD 0.044) and 0.050 mm (SD 0.022), respectively. CT estimated femoral head penetration in both all-poly and metal-backed acetabular components with accuracy ranging from 0.009 to 0.245 mm (mean 0.080; SD 0.067). Interpretation We found that the CT method is rapid, is accurate, and has repeatability and ease of availability. Using a slice thickness of 0.0625 mm, this method can detect wear-and also the threshold for the wear rate that causes osteolysis-much earlier than previous methods. pubtype: Academic Journal doctype: diagnostic images research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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