Stability of Uncemented Cups - Long-Term Effect of Screws, Pegs and HA Coating: A 14-Year RSA Follow-Up of Total Hip Arthroplasty

V.T.C. Otten; S. Crnalic; S.M. Röhrl; Bo Nivbrant; K.G. Nilsson

doi:10.1016/j.arth.2015.07.012

Stability of Uncemented Cups - Long-Term Effect of Screws, Pegs and HA Coating: A 14-Year RSA Follow-Up of Total Hip Arthroplasty

V.T.C. Otten, S. Crnalic, S.M. Röhrl, Bo Nivbrant, K.G. Nilsson

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

© 2016 Elsevier Inc. Screws, pegs and hydroxyapatite-coating are used to enhance the primary stability of uncemented cups. We present a 14-year follow-up of 48 hips randomized to four groups: press-fit only, press-fit plus screws, press-fit plus pegs and hydroxyapatite-coated cups. Radiostereometric migration measurements showed equally good stability regardless cup augmentation. The mean wear rate was high, 0.21. mm/year, with no differences between the groups. Seven hips had radiographical osteolysis but only in hips with augmented cups. Cups without screw-holes compared with cups with screw-holes resulted in better clinical outcome at the 14-year follow-up. Thus, augmentation of uncemented cups with screws, pegs, or hydroxyapatite did not appear to improve the long-term stability compared with press-fit only.

Original language	English
Pages (from-to)	156-161
Number of pages	6
Journal	Journal of Arthroplasty
Volume	31
Issue number	1
DOIs	https://doi.org/10.1016/j.arth.2015.07.012
Publication status	Published - 1 Jan 2016

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AU - Röhrl, S.M.

AU - Nivbrant, Bo

AU - Nilsson, K.G.

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AB - © 2016 Elsevier Inc. Screws, pegs and hydroxyapatite-coating are used to enhance the primary stability of uncemented cups. We present a 14-year follow-up of 48 hips randomized to four groups: press-fit only, press-fit plus screws, press-fit plus pegs and hydroxyapatite-coated cups. Radiostereometric migration measurements showed equally good stability regardless cup augmentation. The mean wear rate was high, 0.21. mm/year, with no differences between the groups. Seven hips had radiographical osteolysis but only in hips with augmented cups. Cups without screw-holes compared with cups with screw-holes resulted in better clinical outcome at the 14-year follow-up. Thus, augmentation of uncemented cups with screws, pegs, or hydroxyapatite did not appear to improve the long-term stability compared with press-fit only.

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Stability of Uncemented Cups - Long-Term Effect of Screws, Pegs and HA Coating: A 14-Year RSA Follow-Up of Total Hip Arthroplasty

Abstract

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