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The Oswestry-Bristol Classification.

Nikhil Sharma1, Ashley Brown1, Theodoros Bouras1

  • 1The Robert Jones and Agnes Hunt Orthopaedic Hospital NHS Foundation Trust, Gobowen, UK.

The Bone & Joint Journal
|January 1, 2020
PubMed
Summary
This summary is machine-generated.

The Oswestry-Bristol Classification (OBC) offers improved reliability for assessing trochlear dysplasia severity compared to the Dejour system. This new MRI-based classification aids in standardizing surgical decisions for patellofemoral instability.

Keywords:
Dejour classificationMedial patellofemoral ligament reconstructionPatellofemoral instabilityTrochlear dysplasia

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Area of Science:

  • Orthopaedic Surgery
  • Radiology
  • Biomedical Engineering

Background:

  • Trochlear dysplasia is a key factor in patellofemoral instability.
  • The current standard, Dejour classification, demonstrates poor reliability in imaging assessments.
  • Accurate severity grading is crucial for effective surgical management.

Purpose of the Study:

  • To evaluate the inter- and intraobserver reliability of the Oswestry-Bristol Classification (OBC) for trochlear dysplasia.
  • To compare the reliability of the OBC with the established Dejour classification system.

Main Methods:

  • Thirty-two CT and axial MRI scans were independently reviewed by four orthopaedic surgeons.
  • Scans were classified using both the Oswestry-Bristol Classification (OBC) and the Dejour classification.
  • Inter- and intraobserver agreement were statistically analyzed using kappa and S-statistics.

Main Results:

  • The Oswestry-Bristol Classification (OBC) achieved fair-to-good interobserver agreement (mean kappa 0.68).
  • The OBC demonstrated good-to-excellent intraobserver agreement.
  • The Dejour classification showed poor interobserver agreement (mean kappa 0.52) and fair-to-good intraobserver agreement.

Conclusions:

  • The Oswestry-Bristol Classification (OBC) is a reliable tool for assessing trochlear dysplasia severity.
  • The OBC can enhance clinical practice by standardizing surgical decision-making for recurrent patellar instability.
  • This MRI-specific system offers a more consistent approach to grading trochlear dysplasia.