Aseptic loosening of the option stemmed tibial tray in the Zimmer NexGen LPS total knee arthroplasty system.
Knee
; 47: 1-12, 2024 Mar.
Article
en En
| MEDLINE
| ID: mdl-38171206
ABSTRACT
BACKGROUND:
We investigated the relationship between the backside deformation of polyethylene (PE) tibial inserts and aseptic loosening of the Option stemmed tibial tray used with Zimmer NexGen posterior-stabilised (PS) devices. We hypothesized that explanted inserts used in PS designs would exhibit greater extents of PE backside deformation than those used in equivalent cruciate retaining (CR) designs and that PE inserts retrieved from total knee arthroplasties (TKAs) revised for aseptic tibial tray loosening would exhibit greater extents of backside deformation than TKAs revised for other reasons.METHODS:
A total of 73 explanted fixed-bearing TKAs (42 CR and 31 PS) were examined. PE components underwent geometric examination with a coordinate measuring machine using validated techniques. Multiple regression modelling was used to identify variables associated with revision secondary to aseptic loosing and to determine factors associated with increased PE backside deformation.RESULTS:
PE inserts retrieved from TKAs with aseptic loosening had significantly greater backside deformation than those retrieved from TKAs revised for other reasons (p < 0.001). Greater PE backside deformation was significantly associated with larger tray/insert clearance heights (p < 0.001), thinner inserts (p < 0.001) and PS TKAs (p = 0.001).CONCLUSION:
PE backside deformation was significantly greater in the PS TKAs. This may provide one explanation for the increased rate of aseptic loosening reported with the Option tibial tray used with the Legacy Posterior Stabilised (LPS) system.Palabras clave
Texto completo:
1
Base de datos:
MEDLINE
Asunto principal:
Diseño de Prótesis
/
Falla de Prótesis
/
Artroplastia de Reemplazo de Rodilla
/
Polietileno
/
Prótesis de la Rodilla
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Knee
Asunto de la revista:
ORTOPEDIA
Año:
2024
Tipo del documento:
Article