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Related Concept Videos

Functional Classification of Joints01:09

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Functional Classification of Joints
The functional classification of joints is determined by the amount of mobility between the adjacent bones. Joints are functionally classified as a synarthrosis or immobile joint, an amphiarthrosis or slightly moveable joint, or as a diarthrosis, a freely moveable joint. Fibrous and cartilaginous joints can be functionally classified as either synarthroses  or amphiarthroses, whereas all synovial joints are classified as diarthroses.
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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.
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Updated: Jun 29, 2025

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Cemented dual-mobility constructs in uncemented revision acetabular components.

Jacob M Wilson1, Robert T Trousdale1, Nicholas A Bedard1

  • 1Department of Orthopedic Surgery, Mayo Clinic, Rochester, Minnesota, USA.

The Bone & Joint Journal
|March 31, 2024
PubMed
Summary

This study shows that cementing a dual-mobility (DM) cup into an uncemented acetabular shell during revision total hip arthroplasty (THA) offers good implant survival and fixation, though dislocation remains a risk.

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Arthroplasty Research

Background:

  • Dislocation is a primary complication in revision total hip arthroplasty (THA).
  • Dual-mobility (DM) bearings reduce dislocation risk, but options are limited with uncemented shells.
  • A technique involves cementing a monoblock DM cup into an uncemented acetabular shell.

Purpose of the Study:

  • To evaluate implant survival, complications, and radiological outcomes of cementing a DM cup into an uncemented acetabular shell during revision THA.
  • To assess the feasibility and effectiveness of this construct in complex cases.

Main Methods:

  • A retrospective review of 65 hips (64 patients) undergoing revision THA with this technique between 2018-2020.
  • DM cups were cemented into uncemented shells (new or retained).
  • Kaplan-Meier survival analysis and radiological assessment were performed with a mean 2-year follow-up.

Main Results:

  • Two-year survival rates free of aseptic DM revision and dislocation were 92%.
  • Nine revisions occurred: 3 for infection, 3 for aseptic loosening, 2 for dislocation, 1 for construct failure.
  • Five postoperative dislocations occurred, primarily in patients with prior instability or abductor deficiency.

Conclusions:

  • Cementing a DM cup into an uncemented shell is a viable option in revision THA, maximizing head size and optimizing component position.
  • This technique demonstrated good implant fixation, with only one failure at the cemented interface.
  • While dislocation risk is reduced, it is not eliminated, particularly in high-risk patients.