Are the Oxford® medial unicompartmental knee arthroplasty new instruments reducing the bearing dislocation risk while improving components relationships? A case control study - 18/03/16
Bienvenue sur EM-consulte, la référence des professionnels de santé.
Article gratuit.
Connectez-vous pour en bénéficier!
Abstract |
Introduction |
The recently introduced Microplasty® system is an upgrade of conventional phase III instrumentation. However, little is known of its impact on the position of the implant following the Oxford® mobile-bearing unicompartmental knee arthroplasty (UKA). This study investigated whether the Microplasty® instrumentation system can improve the positioning of the implant and reduce the rate of early failure.
Hypothesis |
Microplasty® provides a better positioning and decreases the rate of dislocation.
Materials and methods |
The medical records and radiographs of 82 consecutive Oxford® UKAs were reviewed retrospectively. The radiographic parameters and prevalence of early failure of 41 UKAs performed with the Microplasty® system and 41 UKAs using the conventional instrumentation system were compared. Both groups were comparable in terms of demographics and preoperative status.
Results |
The femoral components in the Microplasty® group were more contiguously placed and more convergent in relation to the tibial components compared to the conventional instrumentation system (P<0.01). The frequency of bearing dislocation was lower in the Microplasty® group (P=0.04). A wide gap and the angle between components were associated with an increased risk of bearing dislocation.
Conclusion |
The Microplasty® instrumentation system consistently placed the femoral and tibial components in more contiguous and convergent positions. Such changes in position decreased the risk of bearing dislocations by reducing the space available for bearing rotation.
Level of evidence |
Level III, case control study.
Le texte complet de cet article est disponible en PDF.Keywords : Knee arthroplasty, Unicompartimental arthroplasty, Joint prosthesis instruments
Plan
Vol 102 - N° 2
P. 183-187 - avril 2016 Retour au numéro
Article précédent
- Effects of third fragment size and displacement on non-union of femoral shaft fractures after locking for intramedullary nailing
- J.R. Lee, H.-J. Kim, K.-B. Lee
- Allograft integration in a rabbit transgenic model for anterior cruciate ligament reconstruction
- M. Bachy, I. Sherifi, F. Zadegan, H. Petite, R. Vialle, D. Hannouche
Bienvenue sur EM-consulte, la référence des professionnels de santé.