Quantification of Bone and Cement Strains Surrounding a Distal Ulnar Implant With Varying Cement-Stem Interface Conditions

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Abstract and keywords

Implant loosening following joint replacement surgery is a health-care concern. The role of implant-cement debonding on the propensity of loosening has received limited attention. This thesis examines changes in strains within the cement mantle and bone surrounding distal ulnar implants, as a function of cement-stem interface bonding. A method to embed strain gauges within the cement mantle of the restrictive distal ulnar canal was developed. This technique was applied in 8 cadaveric distal ulnae, where strains were quantified at 2 internal and 5 external (i.e., bone surface) locations under torsion and bending loads with bonded and de-bonded cement-stem interfaces. For a bonded stem, the distal-most external strains increased under all loading scenarios, while proximal internal strains increased only under torsional loading (p&t;0.05). A finite element model of the testing scenarios with bending loads gave similar results. This work will contribute to the future optimization of distal ulnar implants.

Keywords: distal radioulnar joint; distal ulnar implant; bone cement; cement-stem interface conditions; implant debonding; strain gauge embedment

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Cited By (1)

Year	Entry
2013	Hosein YK. The Effect of Stem Surface Treatment and Substrate Material on Joint Replacement Stability: An in-Vitro Investigation Into the Stem-Cement Interface Mechanics Under Various Loading Modes [PhD thesis]. University of Western Ontario; 2013.