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Dislocation of rotating-hinge knee prostheses with antidislocation mechanism.

Daniel Pacha-Vicente¹, Amer Malik, Enric Castellet-Feliu

¹Department of Orthopaedic Surgery, Vall d'Hebron Hospital, Barcelona, Spain.

The Journal of Arthroplasty

|February 19, 2008

Summary

Two cases of femorotibial dislocation occurred in 192 Endo-Model knee reconstructions. This complication arose from antidislocation feature loosening, leading to excessive laxity and implant dislocation in rotating-hinge prostheses.

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Area of Science:

Orthopedic surgery
Biomedical engineering
Prosthetics and implants

Background:

The Endo-Model rotating-hinge prosthesis features an antidislocation mechanism designed to prevent dislocation.
Difficult knee reconstructions often utilize such advanced prosthetic designs.

Observation:

A review of 192 consecutive Endo-Model prosthesis implantations identified two instances of femorotibial dislocation.
These dislocations occurred despite the presence of the antidislocation feature.

Findings:

Loosening of the antidislocation feature can lead to increased flexion laxity.
This laxity permits excessive distraction, ultimately causing implant dislocation.

Implications:

This study highlights a potential failure mode in rotating-hinge knee prostheses with antidislocation designs.

Related Experiment Videos

Further research may be needed to refine or reinforce antidislocation mechanisms in knee implants.

Clinicians should be aware of this potential complication during difficult knee reconstructions.