Retrieval analysis in total knee arthroplasty

Table 5 Main data on some specific designs in retrieval analysis in total knee arthroplasty

Ref.	Methods	Results	Conclusions
Cerquiglini et al[14], 2019	These authors examined 12 Ti PFC Sigma implants, eight CoCr PFC Sigma implants, eight cobalt-chromium PFC Sigma RP implants, and 11 Attune implants	There was no evidence of cement attachment on any of the 11 Attune trays examined. There were significant differences between Ti and CoCr PFC Sigma implants and Attune designs	The majority of the earliest PFC Sigma designs showed evidence of cement, while all of the retrieved Attune trays and the majority of the RP PFC trays in this study had no cement attached
Bormann et al[15], 2020	In this study, wear volume and influencing parameters were investigated at 44 retrieved TKAs with MoM couplings	An elevated wear score of two or higher was found in 43% of cases. A tendency for higher wear scores with higher inlay degradation scores was found	The generated wear volume was high
Mathis et al[16], 2021	These authors investigated the in vivo performance of a new design (Persona), by comparing it with its predecessor (NexGen) in retrieval analysis	The Persona tibial tray showed a significantly smoother surface (0.06 μm) compared to the NexGen (0.2 μm)	The bonding of the antioxidant vitamin-E to the PE component chain used in the novel Persona knee system does not reduce in vivo surface damage compared to highly crosslinked PE component without supplemented vitamin-E used in its predecessor knee system NexGen
Malahias et al[17], 2022	This study examined if the use of the Optetrak Logic PS femoral component was associated with early and more extensive aseptic loosening compared with other PS femoral components. Sixteen individuals received the Optetrak Logic PS femoral component (group A), while 11 received other PS femoral components (group B)	A significant difference was found in presence of backside femoral burnishing between group A (15 of 16 patients; 93.8%) and group B (5 of 11 patients; 45.6%)	The earlier failure rate with the Optetrak Logic PS femoral component was of concern

TKA: Total knee arthroplasty; Ti: Titanium; CoCr: Cobalt-chromium; RP: Rotating platform; MoM: Metal-on-metal; PS: Posterior stabilized; PE: Polyethylene.