scholarly journals Clinical evaluation of model-based radiostereometric analysis to measure femoral head penetration and cup migration in four different cup designs

2017 ◽  
Vol 35 (4) ◽  
pp. 760-767 ◽  
Author(s):  
Bita Shareghi ◽  
Per-Erik Johanson ◽  
Johan Kärrholm
Keyword(s):  
Femoral Head ◽  
Clinical Evaluation ◽  
Radiostereometric Analysis ◽  
Head Penetration ◽  
Model Based ◽  
Femoral Head Penetration

Evaluation of a new cemented highly cross-linked all-polyethylene cup: a prospective and randomised study assessing wear and fixation characteristics using radiostereometric analysis

2021 ◽  
pp. 112070002198999
Author(s):  
Volker Otten ◽  
Daniel Wästerlund ◽  
John Lindbjörn ◽  
Carl Mertens ◽  
Sebastian Mukka ◽  
...  
Keyword(s):  
Femoral Head ◽  
Polyethylene Wear ◽  
Controlled Trial ◽  
Controlled Study ◽  
Radiostereometric Analysis ◽  
Randomised Study ◽  
Head Penetration ◽  
Proximal Migration ◽  
Secondary Outcomes ◽  
Femoral Head Penetration

Background and purpose: The aim of this prospective, randomised and controlled study was to evaluate the wear and fixation properties of a new cemented highly cross-linked all-polyethylene (HXLPE) cup in comparison with a conventional cemented ultra-high molecular weight polyethylene (ConvPE) cup using radiostereometric analysis (RSA). Patients and methods: A total of 58 patients (58 hips) with primary osteoarthritis (OA) were enrolled in a randomised controlled trial to receive either a ConvPE cup (control) or HXLPE cup (intervention) with identical geometry. The subjects were randomised in a 1:1 ratio. The primary endpoint was proximal wear measured as femoral head penetration into the cup, secondary outcomes were 3D-wear and annual proximal wear from 1 to 5 years. Cup fixation was measured as movement of the cup in relation to the acetabular bone with proximal migration being the primary outcome measure, 3D-migration and change in inclination as secondary outcomes. The patients were followed for 5 years with RSA performed postoperatively, at 3, 12, 24, and 60 months. Results: The HXLPE displayed a lower median proximal femoral head penetration compared to ConvPE, with a median difference at 2 years of –0.07 mm (95% CI, –0.10 to –0.04 mm), and –0.19 mm (95% CI, –0.27 to –0.15 mm) at 5 years. Annual proximal wear between 1 and 5 years was 0.03 mm/year for HXLPE and 0.06 mm/year for ConvPE (mean difference 0.05 mm, [95% CI, 0.03–0.07 mm]). Proximal migration, 3D migration and change in inclination was numerically slightly higher for HXLPE, albeit not statistically significant. Conclusions: Compared to ConvPE, the HXLPE cup displayed significantly lower polyethylene wear. Cup migration was not statistically significant different. ClinicalTrials.gov Identifier: NCT04322799.

Standing versus Supine Radiographs in RSA Evaluation of Femoral Head Penetration

2006 ◽  
Vol 448 ◽  
pp. 46-51 ◽  
Author(s):  
Charles R Bragdon ◽  
Jonas Thanner ◽  
Meridith E Greene ◽  
Henrik Malchau ◽  
Georgios Digas ◽  
...  
Keyword(s):  
Femoral Head ◽  
Head Penetration ◽  
Femoral Head Penetration

Characterization of Long-Term Femoral-Head-Penetration Rates

2000 ◽  
Vol 82 (8) ◽  
pp. 1102-1107 ◽  
Author(s):  
JAMES E. DOWD ◽  
CHRISTI J. SYCHTERZ ◽  
ANTHONY M. YOUNG ◽  
CHARLES A. ENGH
Keyword(s):  
Femoral Head ◽  
Head Penetration ◽  
Femoral Head Penetration

scholarly journals Does vitamin E highly-crosslinked polyethylene convey an advantage in primary total hip replacement? A systematic review and meta-analysis

2019 ◽  
Vol 30 (5) ◽  
pp. 598-608 ◽  
Author(s):  
Michael C Wyatt ◽  
Andrew Roberton ◽  
Michael Foxall-Smi ◽  
Andrew D Beswick ◽  
Setor K Kunutsor ◽  
...  
Keyword(s):  
Systematic Review ◽  
Vitamin E ◽  
Femoral Head ◽  
Hip Replacement ◽  
Meta Analysis ◽  
Risk Of Bias ◽  
Initial Screening ◽  
Head Penetration ◽  
Clinically Significant ◽  
Femoral Head Penetration

Background: Vitamin E highly cross-linked polyethylene (HXLPE) was developed to reduce wear in total hip replacement (THR). This formal systematic review and meta-analysis aimed to provide independent synthesis of wear characteristics of Vitamin E treated HXLPE compared to HXPLE/UHMWPE. Secondary outcome measures were differences in revision rates and functional scores. Methods: We performed a formal systematic review as per PRISMA guidelines; literature searches were conducted on 14 November 2017 (MEDLINE, Embase on Ovid, and the Cochrane Library). We included randomised controlled trials, analyses of joint registries, and case-controlled studies of primary THR comparing cups with a vitamin E HXLPE bearing with bearing surfaces made from other types of polyethylene. Initial screening was performed by 2 independent assessors; disagreement resolved in discussion with a third reviewer. Studies were evaluated using the Cochrane risk of bias tool. Data extraction permitted meta-analysis. Results: 372 studies were identified on initial screening, 5 studies met the eligibility criteria. There was no significant heterogeneity between studies. There was variable risk of bias. At a mean of 35 (range 20–60) months, Vitamin E HXLPE had significant advantages over highly cross-linked polyethylene with regards total femoral head penetration ( p = 0.004). Given the RSA measurement errors this may not be clinically significant. There were neither significant differences in revision rates nor Harris Hip Scores ( p = 0.06). Conclusion: At a minimum of 3 years follow-up there was reduced total femoral head penetration for vitamin E HXLPE over HXLPE. This bearing surface does not, as yet, have clinically significant advantages in terms of revision rates or patient function over HXLPE.

Comparison of Steady State Femoral Head Penetration Rates Between Two Highly Cross-Linked Polyethylenes in Total Hip Arthroplasty

2010 ◽  
Vol 25 (5) ◽  
pp. 680-686 ◽  
Author(s):  
John-Paul Whittaker ◽  
Kory D. Charron ◽  
Richard W. McCalden ◽  
Steven J. MacDonald ◽  
Robert B. Bourne
Keyword(s):  
Steady State ◽  
Femoral Head ◽  
Total Hip Arthroplasty ◽  
Hip Arthroplasty ◽  
Head Penetration ◽  
Total Hip ◽  
Femoral Head Penetration
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