Center index method—an alternative for wear measurements with radiostereometry (RSA)

Dahl, Jon E.; Figved, Wender; Snorrason, Finnur; Nordsletten, Lars; Röhrl, Stephan M

doi:10.1002/jor.22241

Cited by 8 publications

(6 citation statements)

References 18 publications

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“…In contrast to the convincing values of the Spearman and Pearson ICCs shown in Table I , the ICC is lower than that determined by Dahl et al 3 for RSA analyses (0.95). This indicates that filling an insert with liquid is more susceptible to differences experienced by the observers than it is when semi-automatically defining the position of RSA spheres in radiographs.…”

Section: Discussioncontrasting

confidence: 86%

“…This indicates that filling an insert with liquid is more susceptible to differences experienced by the observers than it is when semi-automatically defining the position of RSA spheres in radiographs. In comparison with the data of Dahl et al, 3 the precision of the method in the present work depended on the absolute amount of wear.…”

Section: Discussionsupporting

confidence: 77%

“…It can be determined more accurately using radiostereometry (RSA), as the vector of penetration of the femoral head can be determined three-dimensionally. 3 , 4 …”

Section: Introductionmentioning

confidence: 99%

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A simple method of measuring the wear of explanted acetabular component inserts

Krakow

Klockow

Roehner

et al. 2017

Bone & Joint Research

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ObjectivesThe determination of the volumetric polyethylene wear on explanted material requires complicated equipment, which is not available in many research institutions. Our aim in this study was to present and validate a method that only requires a set of polyetheretherketone balls and a laboratory balance to determine wear.MethodsThe insert to be measured was placed on a balance, and a ball of the appropriate diameter was inserted. The cavity remaining between the ball and insert caused by wear was filled with contrast medium and the weight of the contrast medium was recorded. The volume was calculated from the known density of the liquid. The precision, inter- and intraobserver reliability, were determined by four investigators on four days using nine inserts with specified wear (0.094 ml to 1.626 ml), and the intra-class correlation coefficient was calculated. The feasibility of using this method in routine clinical practice and the time required for measurement were tested on 84 explanted inserts by one investigator.ResultsIn order to get the mean for all investigators and determinations, the deviation between the measured and specified wear was -0.08 ml (sd 0.12; -0.21 to 0.11). The interobserver reliability was 0.989 ml (95% confidence interval (CI) 0.964 to 0.997) and the intraobserver reliability was 0.941 for observer 1 (95% CI 0.846 to 0.985), 0.983 for observer 2 (95% CI 0.956 to 0.995), 0.939 for observer 3 (95% CI 0.855 to 0.984), and 0.934 for observer 4 (95% CI 0.790 to 0.984). The mean time required to examine the samples was two minutes (sd 2; 1 to 5).ConclusionThe method presented here was shown to be sufficiently precise for many settings and is a cost-effective and quick method of determining the volumetric wear of explanted acetabular components. However, the measurement of wear for scientific purposes will probably continue to involve more accurate and dedicated laboratory equipment.Cite this article: L. Krakow, A. Klockow, E. Roehner, S. Brodt, H. Eijer, J. Bossert, G. Matziolis. A simple method of measuring the wear of explanted acetabular component inserts. Bone Joint Res 2017;6:530–534. DOI: 10.1302/2046-3758.69.BJR-2016-0249.R1

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Section: Discussioncontrasting

confidence: 86%

Section: Discussionsupporting

confidence: 77%

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A simple method of measuring the wear of explanted acetabular component inserts

Krakow

Klockow

Roehner

et al. 2017

Bone & Joint Research

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“…12 RSA wear analysis can also be performed in a retrospective manner using the center index method. 13 With this method, the relative location in threedimensional space of the femoral head to the acetabular cup is measured in the present-day exam. The immediate post-operation position of the head to the cup is assumed to be a central point defined by the circumference of the acetabular cup.…”

Section: Methodsmentioning

confidence: 99%

Wear performance of cobalt chromium, ceramic, and oxidized zirconium on highly crosslinked polyethylene at mid-term follow-up

Teeter

MacLean

Somerville

et al. 2018

Journal of Orthopaedics

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Patients with THA using a ceramic head and using an OxZr head were each matched to patients with a CoCr head. Mean implantation time was 5 years. There was no difference in steady state wear rate between the ceramic (0.066 ± 0.050 mm/year) and CoCr match groups (0.052 ± 0.041 mm/year), or between the OxZr (0.022 ± 0.029 mm/year) and CoCr match groups (0.048 ± 0.071 mm/year). Follow-up into the second decade will be necessary before any changes in THA wear rate from using ceramic or OxZr bearings may be appreciated clinically with available imaging techniques.

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“…12 Patients underwent a standard supine RSA examination with simultaneous, bilateral calibrated radiograph exposures. The 3-dimensional difference between the current location of the femoral head and the original location of the femoral head (at the time of the index proced ure, before any wear occurred) was calculated as the total femoral head penetration.…”

Section: Methodsmentioning

confidence: 99%

Thirteen-year wear rate comparison of highly crosslinked and conventional polyethylene in total hip arthroplasty: long-term follow-up of a prospective randomized controlled trial

Teeter

Yuan

Somerville

et al. 2017

CJS

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Thirteen-year wear rate comparison of highly crosslinked and conventional polyethylene in total hip arthroplasty: long-term follow-up of a prospective randomized controlled trial Background: The purpose of this study was to report the radiographic wear rates from a previous randomized controlled trial of first-generation highly crosslinked versus conventional polyethylene in total hip arthroplasty (THA) at a minimum of 13 years' follow-up. Methods:Patients returned for radiographic imaging and radiostereometric analysis (RSA). Radiographs were reviewed for the presence of osteolysis or component loosening. Femoral head penetration (which includes both wear and creep) was measured using RSA. We compared Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC), 12-Item Short Form Health Survey (SF-12) and Harris Hip Scores (HHS) with preoperative values. Results:There was 1 revision in each group. There was no difference in WOMAC, SF-12, or HHS outcome scores between the highly crosslinked and conventional polyethylene groups (all p ≥ 0.13). Wear rate was lower with crosslinked polyethylene than conventional polyethylene (0.04 ± 0.02 mm/year v. 0.08 ± 0.03 mm/year, p = 0.007). Conclusion:First-generation crosslinked polyethylene demonstrates greater wear resistance than conventional polyethylene after 13 years of implantation. Crosslinked polyethylene continues to outperform conventional polyethylene into the second decade of implantation.

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Center index method—an alternative for wear measurements with radiostereometry (RSA)

Cited by 8 publications

References 18 publications

A simple method of measuring the wear of explanted acetabular component inserts

A simple method of measuring the wear of explanted acetabular component inserts

Wear performance of cobalt chromium, ceramic, and oxidized zirconium on highly crosslinked polyethylene at mid-term follow-up

Thirteen-year wear rate comparison of highly crosslinked and conventional polyethylene in total hip arthroplasty: long-term follow-up of a prospective randomized controlled trial

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