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

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Otten, Volker,1973-Umeå universitet,Ortopedi (author)

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

Article/chapterEnglish2022

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2021-02-10
Sage Publications,2022
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LIBRIS-ID:oai:DiVA.org:umu-180299
https://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-180299URI
https://doi.org/10.1177/1120700021989991DOI

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Language:English
Summary in:English

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Subject category:art swepub-publicationtype

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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.

Subject headings and genre

MEDICIN OCH HÄLSOVETENSKAP Klinisk medicin Ortopedi hsv//swe
MEDICAL AND HEALTH SCIENCES Clinical Medicine Orthopaedics hsv//eng
Highly cross-linked polyethylene
RCT
RSA
migration
wear

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Wästerlund, DanielUmeå universitet,Ortopedi (author)
Lindbjörn, JohnUmeå universitet,Ortopedi (author)
Mertens, CarlUmeå universitet,Ortopedi (author)
Mukka, SebastianUmeå universitet,Ortopedi(Swepub:umu)semu0002 (author)
Crnalic, SeadUmeå universitet,Ortopedi(Swepub:umu)secr0001 (author)
Nilsson, Kjell G.Umeå universitet,Ortopedi(Swepub:umu)kjni0001 (author)
Umeå universitetOrtopedi (creator_code:org_t)

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In:HIP International: Sage Publications32:6, s. 779-7861120-70001724-6067

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

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