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10.04.2019 | Original Article

The Survivorship of the Uncemented Iso-Elastic Monoblock Acetabular Component at a Mean of 6-Year Follow-up

verfasst von: T. E. Snijders, MD, J. J. Halma, MD, J. R. A. Massier, S. M. van Gaalen, MD, PhD, A. de Gast, MD, PhD

Erschienen in: HSS Journal ®

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Abstract

Background

Aseptic loosening, caused by wear and osteolysis, is the most frequent reason for hip replacement revision in the UK. To prevent aseptic loosening, an acetabular component with vitamin E added to irradiated highly cross-linked polyethylene (HXLPE) was developed to reduce oxidative degradation.

Questions/Purposes

A prior study of the vitamin E–blended HXLPE acetabular component after 2 years of follow-up reported no adverse reactions or abnormal mechanical behavior. To further examine this hypothesis of reducing wear and osteolysis, we sought to evaluate outcomes after 6-year follow-up.

Methods

A cohort of 95 of the 112 initial patients (84.2%) completed the 6 years of follow-up after receiving a vitamin E–blended HXLPE acetabular component. Evaluation was performed in terms of clinical (visual analog scale [VAS] score, VAS score with weight-bearing, VAS score for satisfaction, and Harris Hip Score) and radiological (inclination, polar gap, radiolucencies, migration, and 2-D linear femoral head penetration rate) assessment.

Results

The mean VAS score for patient satisfaction was 8.75 and the mean Harris Hip Score was 91.8. There were two revisions because of deep infections and one because of a peri-prosthetic femoral fracture. Two acetabular components migrated initially; however, delayed acetabular stabilization occurred. Both patients had good clinical scores at 72 months. The mean femoral head penetration rate was 0.036 mm/year.

Conclusions

This prospective cohort study has shown no adverse reactions concerning the vitamin E additive, promising wear rates, no signs of osteolysis, a 100% survival rate for aseptic loosening, and an all-cause survivorship percentage of 97.4% at 6 years of follow-up.
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Metadaten
Titel
The Survivorship of the Uncemented Iso-Elastic Monoblock Acetabular Component at a Mean of 6-Year Follow-up
verfasst von
T. E. Snijders, MD
J. J. Halma, MD
J. R. A. Massier
S. M. van Gaalen, MD, PhD
A. de Gast, MD, PhD
Publikationsdatum
10.04.2019
Verlag
Springer US
Erschienen in
HSS Journal ®
Print ISSN: 1556-3316
Elektronische ISSN: 1556-3324
DOI
https://doi.org/10.1007/s11420-018-09658-8

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