Factors Influencing the Initial Micromotion Between Polyethylene Acetabular Cups and Titanium Alloy Shells

Richard F Kyle, Cheryl D. Riddle, Matthew Kyle, Sara Rockswold, Craig Bourgeault

Research output: Contribution to journalArticle

5 Scopus citations

Abstract

Mechanical test factors affecting short-term rotational stability under combined torsional and compressive loading was assessed in modular press-fit acetabular components with 4 different locking mechanism designs, by measuring the micromotion of the liner-shell interface at either room (20°C) or body temperature (37°C) and with either a high (2943 N) or low (490 N) compressive load. Liner-shell constructs whose short-term stability was statistically significantly affected by temperature exhibited more rotational stability at body temperature than at room temperature. Liner-shell constructs whose short-term stability was statistically significantly affected by the level of compressive load exhibited more rotational stability with high compressive loads than with low loads. Liner-shell constructs with different locking mechanism designs were influenced by temperature and compressive loads differently. It is recommended to consider including these factors in tests of acetabular component locking mechanisms.

Original languageEnglish (US)
Pages (from-to)443-448
Number of pages6
JournalJournal of Arthroplasty
Volume21
Issue number3
DOIs
StatePublished - Apr 1 2006

Keywords

  • acetabular component
  • liner-shell interface
  • locking mechanism
  • micromotion
  • short-term rotational stability

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