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Related Concept Videos

Functional Classification of Joints01:09

Functional Classification of Joints

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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.
Synarthrosis
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Knee Joint01:23

Knee Joint

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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.
A total of seven ligaments support the knee joint. The patellar ligament, which is also attached to the quadriceps femoris...
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Related Experiment Video

Updated: May 5, 2026

The Transition to an Anterior-Based Muscle Sparing Approach Improves Early Postoperative Function but is Associated with a Learning Curve
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Dual mobility in total hip arthroplasty.

Darren R Plummer1, Bryan D Haughom, Craig J Della Valle

  • 1Department of Orthopaedic Surgery, Rush University Medical Center, 1611 West Harrison Street, Suite 300, Chicago, IL 60612, USA.

The Orthopedic Clinics of North America
|November 26, 2013
PubMed
Summary

Dual-mobility cups reduce hip dislocation after total hip arthroplasty (THA). Design improvements aim to minimize wear and intraprosthetic dislocation risks in revision THA.

Keywords:
DislocationDual-mobilityRevision total hip arthroplastyTotal hip arthroplasty

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Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Materials science

Background:

  • Postoperative instability is a primary cause for revision total hip arthroplasty (THA).
  • Dual-mobility cups have emerged as a solution to reduce dislocation rates in primary THA.
  • These cups are also utilized in revision THA to address and prevent instability.

Purpose of the Study:

  • To evaluate the effectiveness of dual-mobility cups in reducing dislocation in total hip arthroplasty.
  • To explore the application of dual-mobility cups in revision THA for instability.
  • To discuss design modifications addressing concerns like wear and intraprosthetic dislocation.

Main Methods:

  • Review of existing literature on dual-mobility cup performance in primary and revision THA.
  • Analysis of biomechanical advantages: increased range of motion, head-to-neck ratio, and jump distance.
  • Examination of design modifications targeting fixation, wear, and intraprosthetic dislocation.

Main Results:

  • Dual-mobility cups demonstrate a reduced rate of dislocation in primary THA.
  • They offer benefits in managing instability during revision THA.
  • Achieved biomechanical advantages contribute to lower instability risk.

Conclusions:

  • Dual-mobility articulations show significant promise in improving THA outcomes.
  • Addressing concerns of wear and intraprosthetic dislocation through design is crucial.
  • Further research into specific design modifications can optimize dual-mobility cup performance.