Development of a testing methodology to quantify bone load transfer patterns for multiple stemmed implants in a single bone with an application in the distal ulna

Journal of Biomechanical Engineering
Rebecca L AustmanC E Dunning

Abstract

Optimal parameters for many orthopaedic implants, such as stem length and material, are unknown. Geometry and mechanical properties of bone can vary greatly amongst cadaveric specimens, requiring a large number of specimens to test design variations. This study aimed to develop an experimental methodology to measure bone strains as a function of multiple implant stem designs in a single specimen, and evaluate its efficacy in the distal ulna. Eight fresh-frozen cadaveric ulnae were each instrumented with 12 uniaxial strain gauges on the medial and lateral surfaces of the bone. The proximal portion of each ulna was cemented in a custom-designed jig that allowed a medially directed force to be applied to the distal articular surface. An implant with a finely threaded stem was cemented into the canal by an experienced upper extremity orthopaedic surgeon. Six loads (5-30 N) were applied sequentially to the lateral surface of the prosthetic head using a materials testing machine. Testing was repeated after breaking the stem-cement bond, and after removing and reinserting the stem several times into the threaded cement mantle. Near the end of the testing period, the initial stem was reinserted and data were collected to determine if t...Continue Reading

References

Jan 1, 1979·Journal of Biomechanics·T M Wright, W C Hayes
Jan 1, 1982·Journal of Biomechanics·J B FinlayJ McLean
May 12, 2005·Journal of Biomechanics·Karen D GordonJames A Johnson
Nov 3, 2005·The Journal of Bone and Joint Surgery. American Volume·Christopher P LittleAndrew J Carr
Dec 21, 2005·The Journal of Bone and Joint Surgery. British Volume·S B SneftrupJ O Søjbjerg

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