Pseudotumour Formation Due to Tribocorrosion at the Taper Interface of Large Diameter Metal on Polymer Modular Total Hip Replacements

Does Surface Topography Play a Role in Taper Damage in Head-neck Modular Junctions?

“…The evaluation of stem and head taper angles was based on only 15 points taken in obviously undamaged areas. Other studies have used full metrology data sets to fit the initial taper geometry and to determine the taper angle [7,8,23]. However, the obtained results fit well within the range of these studies.…”

Femoral Head-Trunnion Dissociation in Metal-on-Polyethylene Total Hip Arthroplasty – A Unique Case Report

“…Further confounders exist as there are studies that both support and refute the concept of taper size and geometry being associated with corrosion [8,9]. In a retrieval analysis, Cook et al suggest that a combination of taper and trunnion angle mismatch, the use of a proximal contacting taper, and coupling of dissimilar metal alloys leads to taper damage and material loss [10]. Subsequent to the above mentioned reports, Styker Orthopaedics (Mahwah, NJ) issued a class II recall of 42,519 Co-Cr V40 LFIT head balls on August 29, 2016.…”

CORR Insights®: Modular to Monoblock: Difficulties of Detaching the M2a-Magnum™ Head Are Common in Metal-on-metal Revisions

“…It has been widely reported [1,3,5,6] that the trunnion becomes damaged after the head or titanium interface is removed. Instead of removing the stem, an alternative sleeve could cover the damaged trunnion.…”

“…However, corrosion is commonly found on metal-on-metal (MoM) large femoral heads, modular prostheses, and revision MoM implants [1,4]. During revision, the prosthesis head must be detached from the stem.…”