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Related Experiment Video

Updated: Feb 8, 2026

Treatment with Locking Intramedullary Nailing for Intertrochanteric Fracture of the Femur Utilizing a New Awl with a Distal Positioner
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Distal radius fractures are difficult to classify.

Daniel Wæver1, Mette Lund Madsen2, Jan Hendrik Duedal Rölfing3

  • 1Department of Orthopaedics, Regionshospitalet Randers, Randers, Denmark; Department of Orthopaedics, Aarhus University Hospital, Aarhus, Denmark.

Injury
|June 23, 2018
PubMed
Summary
This summary is machine-generated.

The AO/OTA classification system showed the most reliable results for distal radius fractures (DRFs), though agreement on fracture groups was weak. Frykman and Older systems had poor reliability for DRF classification.

Keywords:
AO/OTADistal radius fractureFracture classification systemFrykmanInterobserver reliabilityIntraobserver reproducibilityOlderPrognosis

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Area of Science:

  • Orthopaedic surgery
  • Radiology
  • Medical classification systems

Background:

  • Distal radius fractures (DRFs) have historically been described using eponyms.
  • Several classification systems for DRFs emerged in the late 20th century.
  • Evaluating the reliability of these systems is crucial for consistent clinical application.

Purpose of the Study:

  • To assess the inter- and intra-observer agreement of the AO/OTA, Frykman, and Older classification systems for distal radius fractures.
  • To determine which classification system offers the most reliable framework for DRF categorization.

Main Methods:

  • Four observers with varying levels of experience evaluated 573 DRF radiograms.
  • Fractures were classified using the AO/OTA, Frykman, and Older systems.
  • Radiograms of 30 patients were re-evaluated after 6 months to assess intra-observer reproducibility.

Main Results:

  • Inter-observer reliability for AO/OTA fracture types (A, B, C) was 'weak' (kappa = 0.45), dropping to 'minimal' (kappa = 0.24) for detailed groups.
  • Frykman system showed 'weak' inter-observer reliability (kappa = 0.41); Older system had the lowest (kappa = 0.10).
  • Intra-observer reproducibility for AO/OTA types was moderate to good (0.58–0.87), but lower for detailed groups and other systems.

Conclusions:

  • The AO/OTA classification system demonstrates the highest reliability for routine use in distal radius fractures, despite limitations in group agreement.
  • The Frykman and Older classification systems are not recommended due to less convincing reliability results.
  • Standardizing DRF classification is essential for improving diagnostic accuracy and treatment planning.