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Potentiodynamic Corrosion Testing

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Published on: September 4, 2016

Mechanically assisted taper corrosion in modular TKA.

Christina M Arnholt¹, Daniel W MacDonald¹, Mariya Tohfafarosh¹

¹Implant Research Center, Drexel University, Philadelphia, Pennsylvania.

The Journal of Arthroplasty

|July 6, 2014

Summary

Taper corrosion is common in revised total knee arthroplasty (TKA) components. This study found that mixed alloys, taper design, and component type influence fretting corrosion, though clinical impact is uncertain.

Keywords:

TKA corrosion fretting modularity retrieval

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Area of Science:

Biomaterials Science
Orthopedic Surgery
Medical Device Engineering

Background:

Modular total knee arthroplasty (TKA) components are widely used.
Concerns exist regarding the long-term durability and potential failure modes of modular interfaces.
Fretting corrosion at the taper junction is a suspected issue impacting device longevity.

Purpose of the Study:

To investigate the prevalence and characteristics of taper damage in revised modular TKA components.
To identify design features and patient factors associated with fretting corrosion.
To evaluate the extent of fretting corrosion in retrieved femoral and tibial components.

Main Methods:

Analysis of 198 explanted modular TKA components after a mean implantation of 3.9 years.
Semi-quantitative assessment of fretting corrosion using a 4-point scoring system.
Statistical evaluation of design features (e.g., alloy pairing, taper design) and component type as predictors of corrosion.

Main Results:

High prevalence of mild-to-severe fretting corrosion observed in 94% of femoral and 93% of tibial tapers.
Significant associations found between fretting corrosion and mixed alloy pairings (p=0.03), specific taper designs (p<0.001), and component type (p=0.02).
The study confirmed taper corrosion in TKA components.

Conclusions:

Taper corrosion is a prevalent finding in revised modular TKA components.
Component design, material combinations, and type significantly influence the occurrence of taper corrosion.
Further research is needed to clarify the clinical significance and patient outcomes related to taper corrosion in TKA.