Fact-sheet: Knee prosthesis dislocation


Updated on 09/10/2019 at 1:34 PM

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Definition

Concerns sliding prostheses rather than hinged prostheses.
Improper component angulation leading to capsuloligamentous imbalance and eventually femorotibial dislocation.

In posterior-stabilized prostheses, possible posterior dislocation of the tibia behind the femoral implant.

Radiography

Importance of correct implantation with the goal, after total arthroplasty, of achieving a knee that is normally aligned in all three planes of space.

Frontal plane: weight-bearing goniometry (varus/valgus).
Sagittal plane: angular positioning of the implants.
Axial plane: CT.

Ultrasound

Assessment for periprosthetic collection or effusion.

CT

Good component positioning in all three planes, particularly for axial plane assessment.

MRI

Artifacts

Management

Immobilization after reduction
If recurrence, repeat surgery