Is removal of subchondral bone plate advantageous in cemented cup fixation? A randomized RSA study.

Gunnar Flivik, Ingvar Kristiansson, Uldis Kesteris, Leif Ryd

Research output: Contribution to journalArticlepeer-review

19 Citations (SciVal)

Abstract

There is uncertainty regarding whether and how the subchondral bone plate should be treated during acetabular preparation for cemented cup fixation in a total hip arthroplasty. We hypothesized that removing the bone plate would improve the cement-bone interface without jeopardizing the initial cup stability, and therefore, be advantageous to long-term cup survival. We randomized 50 patients with primary osteoarthritis into two groups, one for removal and one for retention of the subchondral bone plate. The patients were evaluated during 2 years followup using repeated radiostereometric examinations, analyses of radiolucent lines, and clinical followups. Patient scoring was done using the Western Ontario and McMaster Universities Osteoarthritis Index, the Short Form-12, and the Harris hip score. Removal of the subchondral bone plate resulted in a superior cement-bone interface with less development of radiolucent lines. The radiostereometry results showed small migrations in both groups. We found no differences in cup stability between groups, although a difference was observed in rotational behavior with the removal group stabilizing in a slightly vertical position whereas the retention group showed slight but progressive rotation into a more horizontal position. No differences were found during clinical followups. Removing the subchondral bone plate, where possible, improves the cement-bone interface without jeopardizing the stability, implying better long-term cup survival. However, it is a more demanding surgical technique.
Original languageEnglish
Pages (from-to)164-172
JournalClinical Orthopaedics and Related Research
Volume448
DOIs
Publication statusPublished - 2006

Subject classification (UKÄ)

  • Orthopedics

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