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Reliability of the Oswestry-Bristol Classification for trochlear dysplasia: expanded characteristics
Christian Konrads1,2, Christoph Gonser1, Sufian S Ahmad1
1Department of Trauma and Reconstructive Surgery, BG Klinik, University of Tübingen, Tübingen, Germany.
Aims:
The Oswestry-Bristol Classification (OBC) was recently described as an MRI-based classification tool for the femoral trochlear. The authors demonstrated better inter- and intraobserver agreement compared to the Dejour classification. As the OBC could potentially provide a very useful MRI-based grading system for trochlear dysplasia, it was the aim to determine the inter- and intraobserver reliability of the classification system from the perspective of the non-founder.
Methods:
Two orthopaedic surgeons independently assessed 50 MRI scans for trochlear dysplasia and classified each according to the OBC. Both observers repeated the assessments after six weeks. The inter- and intraobserver agreement was determined using Cohen's kappa statistic and S-statistic nominal and linear weights.
Results:
The OBC with grading into four different trochlear forms showed excellent inter- and intraobserver agreement with a mean kappa of 0.78.
Conclusion:
The OBC is a simple MRI-based classification system with high inter- and intraobserver reliability. It could present a useful tool for grading the severity of trochlear dysplasia in daily practice.Cite this article: Bone Joint Open 2020;1-7:355-358.
