Micromotion between the half bearings in the Interax prosthesis: A roentgen stereophotogrammetric analysis

Maurilio Marcacci, Raffaella Soavi, Ivano Loreti, Laura Bragonzoni, Francesco Iacono, Andrea Visani

Research output: Contribution to journalArticle

Abstract

We assessed the migration and movement between the half-bearings of the Interax prosthesis in 18 patients using roentgen stereophotogrammetric analysis (RSA). This study showed movements of the tibial component even in successful knee arthroplasty: 17 Prostheses migrated only initially and remained stable after 1 year, whereas 1 prosthesis migrated consistently throughout 3-year follow-up. RSA revealed no or minimal displacement between the half-bearings until the 4-year follow-up, confirming that their fixation to the baseplate was adequate. In the case of loosening, a rotation about the longitudinal axis of 1.3° and a medial-lateral translation of 0.5 mm was observed between the half-bearings. Cold flow was revealed by RSA in the posterior region of the medial half-bearing.

Original languageEnglish
Pages (from-to)991-997
Number of pages7
JournalJournal of Arthroplasty
Volume16
Issue number8
DOIs
Publication statusPublished - 2001

Keywords

  • Cold flow
  • Half-bearing
  • Knee arthroplasty
  • Micromotion
  • Roentgen stereophotogrammetric analysis
  • Wear

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Surgery

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