Journal
MEDICAL ENGINEERING & PHYSICS
Volume 100, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.medengphy.2022.103755
Keywords
Osseointegration; Bone-anchored attachment; Direct skeletal attachment; Osseointegrated prostheses for the rehabilitation of amputees (OPRA); OPRA; Low plasticity burnishing; Fretting fatigue; Mechanical testing
Categories
Funding
- Promobilia Foundation
- IngaBritt and Arne Lundbergs Foundation
- Swedish Foundation for Strategic Research (SSF)
- Swedish Innovation Agency (VINNOVA)
- Swedish Research Council (Vetenskapsradet)
- Integrum AB
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This article investigates the effect of a surface enhancement method (LPB) on the fretting fatigue resistance of bone-anchored implants. The results show that the LPB treatment significantly improves the implant's ability to resist fretting fatigue and reduces wear at the modular interface.
Fretting fatigue is a common problem for modular orthopedic implants which may lead to mechanical failure of the implant or inflammatory tissue responses due to excessive release of wear debris. Compressive residual stresses at the contacting surfaces may alleviate the problem. Here we investigate the potential of a surface enhancement method known as low plasticity burnishing (LPB) to increase the fretting fatigue resistance of bone-anchored implants for skeletal attachment of limb prostheses. Rotation bending fatigue tests performed on LPB treated and untreated test specimens demonstrate that the LPB treatment leads to statistically significantly increased resistance to fretting fatigue (LPB treated test specimens withstood on average 108,780 load cycles as compared with 37,845 load cycles for untreated test specimens, p = 0.004). LPB treated test specimens exhibited less wear at the modular interface as compared with untreated test specimens. This surface treatment may lead to reduced risk of fretting induced component failure and a reduced need for revision of implant system componentry.
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