Validation of a 3D CT method for measurement of linear wear of acetabular cups.
Background We evaluated the accuracy and repeatability of a 3D method for polyethylene acetabular cup wear measurements using computed tomography (CT). We propose that the method be used for clinical in vivo assessment of wear in acetabular cups. Material and methods Ultra-high molecular weight poly...
| Published in: | Acta Orthopaedica Vol. 82; no. 1; pp. 35 - 42 |
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| Main Authors: | , , , , , , , , , |
| Format: | pictorial research tables/charts Journal Article |
| Published: |
Medical Journals Sweden AB
Feb2011
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| Online Access: | View this record in EBSCOhost |
| fields | @attributes: recordID: 1 pdfLink: plink: https://search.ebscohost.com/login.aspx?direct=true&db=ccm&AN=105005090&site=ehost-live header: @attributes: shortDbName: ccm uiTerm: 105005090 longDbName: CINAHL Complete uiTag: AN controlInfo: bkinfo: dissinfo: jinfo: jid: 17453674 1BVL jtl: Acta Orthopaedica issn: 17453674 maglogo: N pubinfo: dt: Feb2011 vid: 82 iid: 1 pid: 59195 pub: Medical Journals Sweden AB artinfo: ui: 105005090 57821853 10.3109/17453674.2011.552777 NLM21281259 105005090 ppf: 35 ppct: 7 formats: fmt: @attributes: type: P tig: atl: Validation of a 3D CT method for measurement of linear wear of acetabular cups. aug: au: Jedenmalm A Nilsson F Noz ME Green DD Gedde UW Clarke IC Stark A Maguire GQ Zeleznik MP Olivecrona H affil: Department of Clinical Sciences, Biomaterial- and Biomechanical Laboratory, Lund University, Lund, Sweden; Department of Fiber and Polymer Technology, School of Chemical Science and Engineering, Royal Institute of Technology, Stockholm, Sweden sug: subj: Arthroplasty, Replacement, Hip Adverse Effects Prostheses and Implants Adverse Effects Tomography, X-Ray Computed Methods Validation Studies Computer Simulation Funding Source In Vitro Studies Descriptive Statistics T-Tests Confidence Intervals ab: Background We evaluated the accuracy and repeatability of a 3D method for polyethylene acetabular cup wear measurements using computed tomography (CT). We propose that the method be used for clinical in vivo assessment of wear in acetabular cups. Material and methods Ultra-high molecular weight polyethylene cups with a titanium mesh molded on the outside were subjected to wear using a hip simulator. Before and after wear, they were (1) imaged with a CT scanner using a phantom model device, (2) measured using a coordinate measurement machine (CMM), and (3) weighed. CMM was used as the reference method for measurement of femoral head penetration into the cup and for comparison with CT, and gravimetric measurements were used as a reference for both CT and CMM. Femoral head penetration and wear vector angle were studied. The head diameters were also measured with both CMM and CT. The repeatability of the method proposed was evaluated with two repeated measurements using different positions of the phantom in the CT scanner. Results The accuracy of the 3D CT method for evaluation of linear wear was 0.51 mm and the repeatability was 0.39 mm. Repeatability for wear vector angle was 17°°. Interpretation This study of metal-meshed hip-simulated acetabular cups shows that CT has the capacity for reliable measurement of linear wear of acetabular cups at a clinically relevant level of accuracy. pubtype: Academic Journal doctype: pictorial research tables/charts Journal Article ougenre: Article language: English refInfo: holdings: @attributes: islocal: N |
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