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01-05-2012 | Original Paper

Failure rate of a rotating hinge knee design due to yoke fracture of the hinged tibial insert: a retrospective data analysis and review of the literature

Authors: Joerg Friesenbichler, Ran Schwarzkopf, Patrick Sadoghi, Scott E. Marwin, Mathias Glehr, Werner Maurer-Ertl, Andreas Leithner

Published in: International Orthopaedics | Issue 5/2012

Abstract

Purpose

Rotating hinge knee prostheses are known to provide inherent stability. Yoke fractures of the hinged tibial insert of modern generation rotating hinge devices are a matter of continued concern. The aim of this study was to describe incidence and management of yoke fracture of the LPS™ hinged tibial insert.

Methods

Retrospective data analysis of two institutions identified 40 patients with a LPS™ total knee arthroplasty. Implant survival and prosthetic complications was calculated according to Kaplan-Meier.

Results

Out of the group of 40 patients, four fractures of the metal yoke occurred in four cases (failure rate: 10%). Furthermore, a second fracture occurred in two patients. The overall revision-free prosthetic survival was 57% at 38 months, while prosthetic survival until yoke fracture was 86% at 38 months.

Conclusion

Handling yoke fractures as mechanical complication includes replacing the hinged insert, stabilization of the joint and joint line height preservation in order to decrease the cantilever effect at the insert-base plate interface.

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Title: Failure rate of a rotating hinge knee design due to yoke fracture of the hinged tibial insert: a retrospective data analysis and review of the literature
Authors: Joerg Friesenbichler
Ran Schwarzkopf
Patrick Sadoghi
Scott E. Marwin
Mathias Glehr
Werner Maurer-Ertl
Andreas Leithner
Publication date: 01-05-2012
Publisher: Springer-Verlag
Published in: International Orthopaedics / Issue 5/2012
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI: https://doi.org/10.1007/s00264-011-1462-9

At a glance: The STEP trials

Springer Medicine

Failure rate of a rotating hinge knee design due to yoke fracture of the hinged tibial insert: a retrospective data analysis and review of the literature

Abstract

Purpose

Methods

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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