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E-pub ahead of print

No difference in whole-blood metal ions between 32-mm and 36- to 44-mm femoral heads in metal-on-polyethylene total hip arthroplasty: a 2-year report from a randomised control trial

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

DOI

  1. A randomised, controlled clinical study on total hip arthroplasty using 4 different bearings: results after 10 years

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  2. Revision rates for metal-on-metal hip resurfacing and metal-on-metal total hip arthroplasty - a systematic review

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  3. 3-year follow-up of a long-term registry-based multicentre study on vitamin E diffused polyethylene in total hip replacement

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

  4. Alternative outcome measures in young total hip arthroplasty patients: a prospective cohort study

    Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

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AIM: To investigate the effect of femoral head size on blood metal-ion levels caused by taper corrosion in metal-on-polyethylene total hip arthroplasty, comparing 36- to 44-mm heads with 32-mm heads.

METHODS: In a randomised, controlled, single-blinded trial, 96 patients were allocated to receive either a 32-mm metal head or the largest possible metal head (36-44 mm) that could be accommodated in the thinnest available vitamin E, cross-linked polyethylene insert. Blood metal ion levels were collected at 1- and 2-year follow-ups.

RESULTS: At 1-year, metal-ion levels did not differ between the groups. The median (interquartile range) blood-ion levels for the 32-mm versus the 36- to 44-mm group were 0.11 µg/L (0.08-0.15) versus 0.12 µg/L (0.08-0.22), p = 0.546, for cobalt, 0.50 µg/L (0.50-0.59) versus 0.50 µg/L (0.50-1.20), p = 0.059, for chromium and 1.58 µg/L (1.38-2.05) versus 1.48 µg/L (1.14-1.87), p = 0.385, for titanium. At 2 years, there was no difference either and the corresponding values were 0.15 µg/L (0.12-0.24) versus 0.18 µg/L (0.12-0.28), p = 0.682 for cobalt, 0.50 µg/L (0.50-0.50) versus 0.50 µg/L (0.50-0.57), p = 0.554, for chromium and 1.54 µg/L (1.16-1.87) versus 1.42 µg/L (1.01-1.72), p = 0.207 for titanium.

CONCLUSIONS: The use of the largest possible metal head (36-44 mm) compared to a 32-mm head in metal-on-polyethylene bearings does not appear to elevate blood metal-ion levels up to 2 years postoperatively. As taper corrosion is probably time-dependent, longer-term reports are needed to evaluate the association between large metal heads and blood metal ion levels.Trial registration: ClinicalTrials.gov (reg. ID NCT0231 6704).

OriginalsprogEngelsk
TidsskriftHip international : the journal of clinical and experimental research on hip pathology and therapy
Sider (fra-til)11207000211022623
ISSN1120-7000
DOI
StatusE-pub ahead of print - 8 jun. 2021

ID: 66134195