Biomedical Engineering Reference
In-Depth Information
Table 16.2
materials-associated indings in thr arthroplasty
Finding
Mechanism
Potential implication
Radiographic
PMMA fragments (early)
Operative debris
Third-body accelerated wear
Single-cycle fracture
PMMA fragments (late)
Fatigue
Third-body accelerated wear
Cup loosening
PMMA mantle fracture (late)
Fatigue
Stem subsidence
Broken cerclage wire
Fatigue
(Early) trochanteric loosening, nonunion
Wire migration
Stem deformation
Plastic yielding
Change in bony support?
Inadequate stem size?
Impending failure?
Stem positioning?
Stem or cup fracture
Fatigue
Manufacturing defect?
Chronic overload
Change in bony support?
Stem/cup positioning?
Local lytic lesion
a
Immune response?
Metal sensitivity?
Excess wear debris?
Progressive failure?
Progressive dissecting lesion
a
Osteoclasis
Excessive wear debris?
Metal sensitivity?
Neoplasm?
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