Stability of Uncemented Cups - Long-Term Effect of Screws, Pegs and HA Coating: A 14-Year RSA Follow-Up of Total Hip Arthroplasty
2016 (English)In: The Journal of Arthroplasty, ISSN 0883-5403, E-ISSN 1532-8406, Vol. 31, no 1, 156-161 p.Article in journal (Refereed) Published
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, 0.21mm/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.
Place, publisher, year, edition, pages
2016. Vol. 31, no 1, 156-161 p.
THA, cup, migration, wear, clinical outcome, radiostereometry
IdentifiersURN: urn:nbn:se:umu:diva-112202DOI: 10.1016/j.arth.2015.07.012ISI: 000366677000031PubMedID: 26260783ScopusID: 2-s2.0-84953839160OAI: oai:DiVA.org:umu-112202DiVA: diva2:876479