Validation of a 3D CT method for measurement of linear wear of acetabular cups: A hip simulator study

Jedenmalm, AnneliLunds universitet,KTH,Fiber- och polymerteknologi,Lund University, Sweden,KTH, Fiber- och polymerteknologi,Ortopedi, Lund,Sektion III,Institutionen för kliniska vetenskaper, Lund,Medicinska fakulteten,Orthopaedics (Lund),Section III,Department of Clinical Sciences, Lund,Faculty of Medicine (author)

Validation of a 3D CT method for measurement of linear wear of acetabular cups : A hip simulator study

QC 20110321
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 degrees A degrees. 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.

Nilsson, FritjofKTH,Fiber- och polymerteknologi,KTH, Fiber- och polymerteknologi(Swepub:miun)frinil2200 (author)
Noz, Marilyn E.New York University, Department of Radiology (author)
Green, Douglas D.Loma Linda University, Orthopaedic Research Center (author)
Gedde, Ulf W.KTH,Fiber- och polymerteknologi,KTH, Fiber- och polymerteknologi(Swepub:kth)u1j56evm (author)
Clarke, Ian C.Loma Linda University, Orthopaedic Research Center (author)
Stark, AndreasKarolinska Institutet (author)
Maguire Jr., Gerald Q.KTH,Radio Systems Laboratory (RS Lab),Computer Communications,KTH, Radio Systems Laboratory (RS Lab)(Swepub:kth)u1d13i2c (author)
Zeleznik, Michael P.Saya Systems Inc., Salt Lake City, UT, USA (author)
Olivecrona, HenrikKarolinska Institute, Department of Molecular Medicine and Surgery (author)
KTHFiber- och polymerteknologi (creator_code:org_t)

In:Acta Orthopaedica: Medical Journals Sweden AB82:1, s. 35-411745-36741745-3682

By the author/editor: Jedenmalm, Annel ...; Nilsson, Fritjof; Noz, Marilyn E.; Green, Douglas D ...; Gedde, Ulf W.; Clarke, Ian C.; show more...; Stark, Andreas; Maguire Jr., Ger ...; Zeleznik, Michae ...; Olivecrona, Henr ...; show less...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Surgery

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Orthopaedics

By the university: Royal Institute of Technology; Mid Sweden University; Lund University; Karolinska Institutet

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