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Related Concept Videos

Knee Joint01:23

Knee Joint

The knee joint is the most complicated joint in the body. It consists of three articulations– two tibiofemoral and one patellofemoral. As is characteristic of synovial joints, the knee joint has a thin articular capsule that partially surrounds this joint cavity. Additionally, several ligaments, muscles, and cartilaginous structures support the movement of the knee.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris group...
Pivot Bearings01:23

Pivot Bearings

In mechanical systems, bearings are crucial in facilitating relative motion between two components while minimizing friction and wear. They help distribute various loads (radial, axial or a combination of both loads) across machinery parts, ensuring smooth and efficient operation.
A pivot bearing is a specialized type of bearing designed to support axial loads on a rotating shaft. The bearing surface, or the pivot, is positioned at the end of a shaft to support the axial thrust. The pivot may...

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Related Experiment Video

Updated: Jun 10, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

Complete 180° rotatory dislocation in a mobile-bearing knee prothesis.

Hussein W Turki1, Lorence Trick

  • 1University of Texas Health Science Center at San Antonio, Texas, USA.

The Journal of Arthroplasty
|July 22, 2010
PubMed
Summary

Rotator platform dislocation in total knee arthroplasty is rare. This case details a 180° spinout after closed reduction, highlighting a novel complication in mobile-bearing knee replacements.

Related Experiment Videos

Last Updated: Jun 10, 2026

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty
07:33

In Vitro Application of a Wireless Sensor in Flexion-Extension Gap Balance of Unicompartmental Knee Arthroplasty

Published on: May 5, 2023

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering

Background:

  • Mobile-bearing total knee arthroplasty (TKA) allows for greater rotational freedom.
  • Dislocation of the rotator platform (polyethylene insert) is an uncommon complication.

Observation:

  • A 57-year-old woman presented with partial rotatory subluxation of the polyethylene component after TKA.
  • Closed reduction was attempted for the subluxation.

Findings:

  • Closed reduction resulted in a complete 180° spinout of the polyethylene component, a previously undescribed event.
  • This represents a unique complication following closed reduction for rotator platform subluxation.

Implications:

  • Surgeons should be aware of the potential for a 180° spinout after closed reduction attempts.
  • Revision surgery with polyethylene exchange may be necessary for such dislocations.