Title

Cement microcracks in thin-mantle regions after in vitro fatigue loading

UMMS Affiliation

Department of Orthopedics and Physical Rehabilitation

Date

7-31-2004

Document Type

Article

Medical Subject Headings

Analysis of Variance; Arthroplasty, Replacement, Hip; Biomechanics; *Bone Cements; Cadaver; Femur; *Hip Prosthesis; Humans; Materials Testing; Prosthesis Failure; Statistics, Nonparametric; Stress, Mechanical; Weight-Bearing

Disciplines

Orthopedics | Rehabilitation and Therapy

Abstract

An in vitro study of cemented femoral hip components was conducted to determine if microcracks in the cement mantle would preferentially form in thin-mantle regions as a result of cyclic fatigue loading via stair-climbing. Overall, there was not an increased amount of microcracks in thin-mantle (<2 >mm) regions (number found/number expected = 0.59, P<.03). However, through cracks that extended between the stem to the bone were more prevalent in thin-mantle regions (number found/number expected = 2.93, P<.03). Although cracks form throughout the cement mantle and appear to grow at the same rate, thin-mantle regions are most likely to have through cracks after fatigue loading. This is consistent with results from at-autopsy studies of well-fixed femoral components and supports the general guideline that thin-mantle regions should be avoided in the cementing of the femoral stem.

Rights and Permissions

Citation: J Arthroplasty. 2004 Aug;19(5):605-12. Link to article on publisher's website

Comments

At the time of publication, David Ayers was not yet affiliated with the University of Massachusetts Medical School.

Related Resources

Link to Article in PubMed

PubMed ID

15284982