The influence of contact conditions and micromotions on the fretting behavior of modular titanium alloy taper connections

What is the Trouble With Trunnions?

“…Retrieval analysis can be used to study how taper geometry, taper tolerances, taper diameter, taper metallurgy, taper surface finish, and femoral head diameter influence risk of tribocorrosion. Some centers have modeled contact conditions and micromotions on fretting behavior of modular taper connections [3,15,17]. Finite element analysis provides clues to these questions, but an in vitro model that reproduces the pattern of taper tribocorrosion seen in vivo will be needed to provide more definitive answers.…”

“…(2) What THA design features are associated with tribocorrosion in taper junctions? (3) What are the microscopic and tribological characteristics of the debris produced at the taper junctions? (4) What are the cellular and immunological traits of the biological response to taper tribocorrosion debris?…”

Surface and subsurface changes as a result of tribocorrosion at the stem-neck interface of bi-modular prosthesis

“…Although modern TJR is considered a generally successful procedure, wear and corrosion at such interfaces is still one factor that can limit the lifetime of the prosthesis [2][3][4][5]. High revision rates owing to Adverse Reaction to Metal Debris (ARMD) and pseudotumour formation have been linked to metal ion release associated with the modular taper interfaces [6,3,5,7].…”

Fretting of CoCrMo and Ti6Al4V alloys in modular prostheses

“…Therefore, previous tribocorrosion studies have employed relatively high contact pressures ranging from 0.87 -1.3 GPa in order to encourage various fretting regimes at the contact. These are namely: stick, partial slip and gross slip fretting regimes 4,5,16 . This study for similar reasons assessed the fretting behavior of the CoCr and Ti tribocouples at an initial Hertzian contact pressure of 1GPa.…”

“…Metallic materials have been used in the design of THRs since their conception in the 19 th century 2 . In the 1970s, modularity was introduced to the design of THR prostheses; hence creating a ceramic -metal and/or metal -metal contact at the modular taper junction 3,4 . The metal -metal contacts are couplings of either similar or dissimilar metallic alloys [5][6][7] .…”