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

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 bo...

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Bibliographic Details
Published in:The Journal of arthroplasty 2006-04, Vol.21 (3), p.443-448
Main Authors: Kyle, Richard F., Riddle, Cheryl D., Kyle, Matthew, Rockswold, Sara, Bourgeault, Craig
Format: Article
Language:English
Subjects:
acetabular component
Acetabulum
Equipment Failure Analysis
Hip Prosthesis
Humans
liner-shell interface
locking mechanism
micromotion
Motion
Polyethylene
Prosthesis Design
Prosthesis Failure
Rotation
short-term rotational stability
Stress, Mechanical
Temperature
Titanium
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Summary: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.
ISSN:0883-5403
1532-8406
DOI:10.1016/j.arth.2005.04.039