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A new technique for diagnosis of acetabular cup loosening using computed tomography - Preliminary experience in 10 patients
Department of Hand Surgery, Södersjukhuset, Stockholm.
Karolinska Institutet, Department of Clinical Science, Intervention and Technology, Division of Radiology.
Karolinska University Hospital Solna, Department of Orthopedics.
New York University, Department of Radiology. (Nuclear Medicine)
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2008 (Engelska)Ingår i: Acta Orthopaedica, ISSN 1745-3674, E-ISSN 1745-3682, Vol. 79, nr 3, s. 346-353Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Background and purpose: Considerable migration of the acetabular cup is required for diagnosis of loosening by conventional radiography. We have developed a new clinically applicable method for assessment of cup loosening using computed tomography (CT). Patients and methods 10 patients scheduled for revision hip replacement due to suspected wear or loosening were scanned twice with CT under torsion loading of the prosthesis. Two independent examiners assessed each patient with respect to motion of the acetabular cup relative to the pelvis using CT volume registration. The CT measurements were compared to findings at revision surgery. Results The method was applicable in 8 of the 10 patients. 1 patient had a severe tremor. In 1 patient, surgery revealed that the hip was ankylotic due to massive ectopic bone formation. This left 8 patients that could be evaluated. 4 cups were loose at surgery, and 3 of these cups could be seen to be mobile by CT. 4 cups that were stable on revision were accurately diagnosed as not being mobile by CT. Movements of less than 1 millimeter between bone and prosthesis could not be distinguished from errors in CT acquisition and volume registration. There was good agreement between the two observers. Interpretation Movement of loose acetabular cups during torsion loading could be detected using CT volume registration. It was sensitive to cup movement in 3 out of 4 cases of loose cups. The method was specific and yielded no false positive results.

Ort, förlag, år, upplaga, sidor
New York, NY, USA: Informa Healthcare , 2008. Vol. 79, nr 3, s. 346-353
Nyckelord [en]
total hip-arthroplasty, semiautomated program, component migration, fusion, ct, radiostereometry
Nationell ämneskategori
Ortopedi Radiologi och bildbehandling
Forskningsämne
SRA - Informations- och kommunikationsteknik
Identifikatorer
URN: urn:nbn:se:kth:diva-17682DOI: 10.1080/17453670710015247ISI: 000257593200007Scopus ID: 2-s2.0-47249136549OAI: oai:DiVA.org:kth-17682DiVA, id: diva2:335727
Anmärkning
QC 20100525Tillgänglig från: 2010-08-05 Skapad: 2010-08-05 Senast uppdaterad: 2018-01-12Bibliografiskt granskad

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Maguire, Gerald Q. Jr.

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