Analysis on stress and micromotion on various peg fixation at glenoid implant

Abstract

Six commercially available implant designs were simulated via finite element analysis. The objectives of this study are (1) to determine the effect of peg numbers and orientations to the stress distribution at the implant and cement (2) to compare the micromotion between fully cemented and partially cemented implant. An applied load of 750 N was subjected to the implant at inferior location in which pegs were distributed. The result showed, by increasing the peg numbers, implant stress decreased and increased maximum stress at cement. While, fully cemented implant had higher micromotion compared to partially cemented implant. There are no significant differences between four-fins and six-fins implants under both load conditions. In conclusion, increase in peg numbers results in decreased stress at implant and partially cemented implant can provide better stability in terms of micromotion than fully cemented as it allows bone in-growth between fins. While, adding more fins in partially cemented implant does not influence the micromotion of the implant at all.

Periprosthetic bone response to axial loading following TKR

“…A few recent studies demonstrate that the maximum compressive stress inside the cancellous bone with a MBT component is just 33 percent of that with a similar APE component (Houdek et al, 2017;Small et al, 2010). Moreover, loading conditions because of altered bone-implant condylar surface geometry, loading patterns, tibial tray placement and malalignment may likewise have significant effect on stress distribution in the periprosthetic region (Dalury et al, 2008;Hunter et al, 2009;Özkan et al, 2013;Wahab et al, 2016).…”