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A new CT method for...
A new CT method for measuring cup orientation after total hip arthroplasty : A study of 10 patients
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- Olivecrona, Henrik (author)
- Karolinska Institute, Department of Molecular Medicine and Surgery
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- Weidenhielm, Lars (author)
- Karolinska Institutet
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- Olivecrona, Lotta (author)
- Karolinska Institutet, Department of Clinical Science, Intervention and Technology, Division of Radiology
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- Beckman, M. O. (author)
- Karolinska Institutet
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- Stark, Andreas (author)
- Karolinska Institutet
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- Noz, Marilyn E. (author)
- New York University, Department of Radiology,Nuclear Medicine
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- Maguire Jr., Gerald Q. (author)
- KTH,Mikroelektronik och informationsteknik, IMIT
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- Zeleznik, Michael P. (author)
- RAHD Oncology Products, St. Loius MO, USA
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- Svensson, Lars E. (author)
- KTH,Matematik
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Jonson, T. (author)
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(creator_code:org_t)
- 2009-07-08
- 2004
- English.
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In: Acta Orthopaedica Scandinavica. - : Medical Journals Sweden AB. - 0001-6470. ; 75:3, s. 252-260
- Related links:
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https://urn.kb.se/re...
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https://doi.org/10.1...
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http://kipublication...
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Abstract
Subject headings
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- Background It is difficult to assess the orientation of the acetabular component on routine radiographs. We present a method for determining the spatial orientation of the acetabular component after total hip arthroplasty (THA) using computed tomography. Patients and methods Two CT-scans, 10 min apart, were obtained from each of 10 patients after THA. Using locally developed software, two independent examiners measured the orientation of the acetabular component in relation to the pelvis. The measurements were repeated after one week. To be independent of the patient position during scanning, the method involved two steps. Firstly, a 3D volumetric image of the pelvis was brought into a standard pelvic orientation, then the orientation of the acetabular component was measured. The orientation of the acetabular component was expressed as operative anteversion and inclination relative to an internal pelvic reference coordinate system. To evaluate precision, we compared measurements across pairs of CT volumes between observers and trials. Results Mean absolute interobserver angle error was 2.3degrees for anteversion (range 0-6.6degrees), and 1.1degrees for inclination (range 0-4.6degrees). For interobserver measurements, the precision, defined as one standard deviation, was 2.9degrees for anteversion, and 1.5degrees for inclination. A Student's West showed that the overall differences between the examiners, trials, and cases were not significant. Data were normally distributed and were not dependent on examiner or trial. Interpretation We conclude that the implant angles of the acetabular component in relation to the pelvis could be detected repeatedly using CT, independently of patient positioning.
Subject headings
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Ortopedi (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Orthopaedics (hsv//eng)
- MEDICIN OCH HÄLSOVETENSKAP -- Klinisk medicin -- Radiologi och bildbehandling (hsv//swe)
- MEDICAL AND HEALTH SCIENCES -- Clinical Medicine -- Radiology, Nuclear Medicine and Medical Imaging (hsv//eng)
Keyword
- acetabular component migration
- semiautomated program
- fusion
- repeatability
- dislocation
- replacement
- prosthesis
Publication and Content Type
- ref (subject category)
- art (subject category)
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Olivecrona, Henr ...
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Weidenhielm, Lar ...
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Olivecrona, Lott ...
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Beckman, M. O.
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Stark, Andreas
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Noz, Marilyn E.
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Maguire Jr., Ger ...
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Zeleznik, Michae ...
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Svensson, Lars E ...
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Jonson, T.
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- About the subject
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- MEDICAL AND HEALTH SCIENCES
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MEDICAL AND HEAL ...
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and Clinical Medicin ...
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and Orthopaedics
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- MEDICAL AND HEALTH SCIENCES
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MEDICAL AND HEAL ...
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and Clinical Medicin ...
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and Radiology Nuclea ...
- Articles in the publication
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Acta Orthopaedic ...
- By the university
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Royal Institute of Technology
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Karolinska Institutet