Evaluation of acetabular stability in uncemented prostheses

Hugh J. Clarke, Riyaz H. Jinnah, Karen E. Warden, M. Biomed Eng, Quentin G.N. Cox, Mark J. Curtis

Research output: Contribution to journalArticlepeer-review

Abstract

The stability of two commonly used uncemented acetabular prostheses fixed with either pegs or screws has been established by evaluating the torque strengths in ten cadaveric acetabulae. The initial stability of implants to simulated frictional loads was satisfactory compared to previous estimations of the frictional torques in polyethylene-on-metal and metal-on-metal articulations. Testing of the torque required to produce 2o of rotation at the bone-implant interface showed that the peg fixation required significantly greater loads than did the screw fixation (P<.03). Testing the prostheses to failure gave good results, although lower than previous cemented arthroplasty estimations. The margin of stability over the frictional torques that can be generated is such that it may affect the bony ingrowth into these prostheses. This may account for the common finding of fibrous ingrowth in these prostheses.

Original languageEnglish (US)
Pages (from-to)335-340
Number of pages6
JournalJournal of Arthroplasty
Volume6
Issue number4
DOIs
StatePublished - 1991

Keywords

  • micromotion
  • torsional acetabular stability
  • uncemented

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine

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