Five-year results of the uncemented RM pressfit cup clinical evaluation and migration measurements by EBRA

Tobias Wyss; Peter Kägi; Peter Mayrhofer; Hubert Nötzli; Dominik Pfluger; Karl Knahr

doi:10.1016/j.arth.2012.11.004

Five-year results of the uncemented RM pressfit cup clinical evaluation and migration measurements by EBRA

J Arthroplasty. 2013 Sep;28(8):1291-6. doi: 10.1016/j.arth.2012.11.004. Epub 2013 Mar 20.

Authors

Tobias Wyss¹, Peter Kägi, Peter Mayrhofer, Hubert Nötzli, Dominik Pfluger, Karl Knahr

Affiliation

¹ Department of Orthopaedic Surgery, Sonnenhof, Berne, Switzerland.

PMID: 23523483
DOI: 10.1016/j.arth.2012.11.004

Abstract

This was a prospective consecutive, study of 50 patients (mean age 72 years, 56% males) treated unilaterally for primary osteoarthrosis using the uncemented, isoelastic, monoblock RM Pressfit Cup. Migration and wear were assessed using the EBRA (Ein-Bild-Röntgen-Analyse) software (201 radiographs from 36 patients). Mean migration was 0.82 mm after 2 years and 1.25 mm after 5 years. A decreasing migration rate over the period was observed. The mean annual wear rate was 0.09 mm/y. Five years after surgery, 84% of patients reached good or excellent Harris hip score values. No revisions related to the acetabular component were necessary. All cups appeared to have high primary stability.

Keywords: EBRA; RM Pressfit Cup; migration; total hip arthroplasty.

MeSH terms

Aged
Algorithms
Arthroplasty, Replacement, Hip*
Female
Follow-Up Studies
Hip Joint / diagnostic imaging*
Hip Joint / surgery
Hip Prosthesis*
Humans
Incidence
Joint Instability / epidemiology
Longitudinal Studies
Male
Osteoarthritis, Hip / surgery
Prospective Studies
Prosthesis Design
Prosthesis Failure*
Radiography
Retrospective Studies
Software
Treatment Outcome