| Determination of digitised radiograph magnification factors for pre-operative templating in hip prosthesis surgery. | |
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MedLine Citation:
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PMID: 19756590 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVE: With digital radiography development, information technology (IT) companies have developed specific software for templating procedures, requiring individual magnification assessments for each patient. The aim of this study was to determine the mean magnification factor of digital radiographs and to evaluate the possibility of using the mean magnification factor or clinical information in templating. MATERIALS AND METHODS: We retrospectively evaluated 100 primary total hip arthroplasty digital radiographs using the femoral head prosthesis as a calliper to determinate the mean magnification factor. Working on the assumption that altitude of the hip during radiograph is decisive in modification of magnification factors, we also looked for a correlation between weight, body mass index (BMI), altitude and magnification factor. RESULTS: The magnification factor was 126% (121-130%). A relationship was found between magnification factor (Mf) and weight (Mf = 7.10(-4)x weight (kg) + 1.21), but not BMI. In 98% of cases, if the weight-correlated formula is used, the sizing is correct or the error is +/- 1 mm. With the mean method the sizing is correct or within 1 mm in only 78.2% of cases. CONCLUSION: Levels of accuracy for the mean magnification factor and the weight-correlated formula are not as high as individual assessments using a calliper; however, they could be used in everyday practice where individual magnification factors have not been calculated. |
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Authors:
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Stephane Descamps; Christine Livesey; Ian Douglas Learmonth |
Publication Detail:
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Type: Clinical Trial; Journal Article Date: 2009-09-16 |
Journal Detail:
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Title: Skeletal radiology Volume: 39 ISSN: 1432-2161 ISO Abbreviation: Skeletal Radiol. Publication Date: 2010 Mar |
Date Detail:
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Created Date: 2010-02-01 Completed Date: 2010-04-26 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7701953 Medline TA: Skeletal Radiol Country: Germany |
Other Details:
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Languages: eng Pagination: 273-7 Citation Subset: IM |
Affiliation:
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Service de Chirurgie Orthop?dique et Traumatologique, H?pital Gabriel Montpied, CHU de Clermont Ferrand, BP 69, 63003, Clermont Ferrand Cedex 01, France. s_descamps@chu-clermontferrand.fr |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Adult Aged Aged, 80 and over Arthroplasty, Replacement, Hip / methods* Female Hip Joint / radiography*, surgery* Humans Male Middle Aged Preoperative Care / methods Prognosis Radiographic Image Enhancement / methods* Radiographic Image Interpretation, Computer-Assisted / methods* Reproducibility of Results Sensitivity and Specificity Young Adult |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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