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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

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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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Conflict of interest

The authors declare that they have no conflict of interest.

Author information

Correspondence to Mathias Glehr.

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Friesenbichler, J., Schwarzkopf, R., Sadoghi, P. et al. 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. International Orthopaedics (SICOT) 36, 993–998 (2012). https://doi.org/10.1007/s00264-011-1462-9

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Keywords

  • Total Knee Arthroplasty
  • Joint Line
  • Mechanical Complication
  • Revision Total Knee Arthroplasty
  • Tibial Insert