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[Rotating platform spinout in LCS knee arthroplasty].

T K Lichtinger¹, A Pingsmann, G Saxler

¹Klinik und Poliklinik für Orthopädie, Universität Duisburg-Essen, Hufelandstrasse 55, 45122, Essen, Germany. thomas.lichtinger@t-online.de

Der Unfallchirurg

|October 18, 2006

Summary

A lax flexion gap in knee arthroplasty can lead to instability and dislocation. This case highlights recurrent subluxations due to rotating platform malrotation (spinout) after LCS total knee arthroplasty.

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Area of Science:

Orthopedic surgery
Biomedical engineering
Knee biomechanics

Background:

Flexion instability following knee arthroplasty can lead to subluxation or dislocation.
The LCS rotating platform total knee arthroplasty is susceptible to specific modes of failure.

Observation:

A case of recurrent subluxations with malrotation (spinout) of the rotating platform after primary LCS total knee arthroplasty is presented.
The laxity of the flexion gap was identified as a critical factor.

Findings:

In LCS rotating platform knee arthroplasty, the flexion gap should not be laxer than the extension gap.
Malrotation, or spinout, of the rotating platform is a potential complication linked to flexion gap laxity.

Implications:

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Surgical technique modifications are crucial to prevent spinout.
Recommendations include utilizing a higher rotating platform and a more proximal distal transverse femoral osteotomy to ensure adequate tensioning of the flexion gap.