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Modular Orthopaedic Implant

Fretting Fatigue & Wear Analysis

Clients:
Orthopaedic Companies

Application:
Modular orthopaedic devices with potential Fretting fatigue & wear analysis of a modular orthopaedic implant design & optimisation to reduce outcomes on femur implant necks

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 Scope:  Modular orthopaedic devices are a feature of total joint replacements today. If modular designs are not ideally matched, this can lead to fatigue & fretting corrosion due to the resulting micro-motion & contact stresses found at the mating surfaces during cyclical loading. This results in interface wear, which can lead to implant rejection due to wear debris induced osteolysis. In this study we assess implant design changes between a modular femoral implant and quantify the resulting fretting fatigue & wear over a gait cycle.

 Input:  Geometric Parameters | Implant Gait Load Cycle | Modular Design Press-Fit Tolerances | Coefficient of Friction| Fatigue Properties (Fretting & S-N Curves) | Wear Factors

 Outputs:  Contact Stresses | Contact Sliding Distances | Slip amplitude | Fatigue Failed Regions (Material & Fretting) | Wear Volumes per Million Cycles

 Physics: Fretting Fatigue | Material Fatigue | Contact | Wear | Solid Mechanics (Stress-Strain)