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Related Concept Videos

Structural Classification of Joints01:20

Structural Classification of Joints

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Joints, also known as articulations, are classified based on their structural characteristics, i.e., based on whether the articulating surfaces of the adjacent bones are directly connected by fibrous connective tissue or cartilage, or whether the articulating surfaces contact each other within a fluid-filled joint cavity. These differences serve to divide the joints of the body into three structural classifications.
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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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Classification of Bones

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The bones of the human skeletal system are of varied shapes, sizes, and functions. They can be classified based on their shape and function into four major classes: long bones, short bones, flat bones, and irregular bones. Some classifications include a fifth type, the sesamoid bones, as a separate class, whereas others categorize them under short bones.
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Interobserver and Intraobserver Reliability of a Novel Classification System for Distal Radioulnar Joint Instability.

Awad Dmour1, Alexandra Maria Burlui1, Bianca-Ana Dmour1

  • 1Faculty of Medicine, Grigore T. Popa University of Medicine and Pharmacy, 700115 Iasi, Romania.

Life (Basel, Switzerland)
|February 27, 2026
PubMed
Summary

A new classification system for distal radioulnar joint instability demonstrates excellent reliability and reproducibility among orthopedic surgeons. This tool promises standardized assessment and improved treatment strategies for these complex fractures.

Keywords:
Essex Lopresti injuryGaleazzi fractureclassification systemdistal radioulnar joint instabilitydistal radius fracturesinterobserver reliabilityintraobserver reliability

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Area of Science:

  • Orthopedic Surgery
  • Trauma Care
  • Radiology

Background:

  • Distal radioulnar joint (DRUJ) instability is inadequately addressed in current fracture classifications, leading to diagnostic ambiguity and varied treatment approaches.
  • A precise and reproducible classification system is crucial for effective clinical management and research in DRUJ instability.

Purpose of the Study:

  • To evaluate the interobserver and intraobserver reliability of a proposed classification system for distal radioulnar joint instability.
  • To assess the clinical utility of this system for standardized diagnosis and management of DRUJ injuries.

Main Methods:

  • Retrospective observational study involving 45 clinical cases of distal radius fractures, Galeazzi fractures, and Essex Lopresti injuries.
  • Five orthopedic surgeons (3 specialists, 2 residents) independently classified cases using predefined clinical and radiological criteria.
  • Interobserver agreement analyzed using Fleiss Kappa; intraobserver reliability assessed using Cohen Kappa after a two-week interval.

Main Results:

  • Excellent overall interobserver agreement (Fleiss Kappa = 0.87), with highest agreement for Galeazzi fractures and lowest for Essex Lopresti injuries.
  • Specialist surgeons showed higher agreement than residents, indicating a learning curve or experience-dependent factor.
  • Excellent intraobserver reproducibility was observed, with 96% identical classifications upon reassessment.

Conclusions:

  • The proposed classification system for distal radioulnar joint instability exhibits high reliability and reproducibility.
  • This system has significant potential for clinical application in standardizing the assessment of DRUJ instability.
  • The findings support its use in guiding future clinical practice and biomechanical research in this field.