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Intra- and inter-observer reliability of Laredo classification system in Legg–Calvé–Perthes Disease

European Journal of Orthopaedic Surgery & Traumatology volume 29, pages 1043–1047 (2019)Cite this article

Abstract

The purpose of the current study was to investigate intra- and inter-observer reliability of arthrographic Laredo classification system in Perthes disease. Forty-seven patients were included in this cross-sectional descriptive study. Patients’ age, gender, physical findings and hip arthrographs were collected from hospital medical records. Two different sets of power point slides were prepared in which the order of cases was randomized and blinded. Observers were divided into three groups according to their surgical experience (9 residents, 10 seniors, 10 pediatric orthopedists), and they assessed two times 1 month’s intervals. Statistical analysis was performed by using the SPSS v21. Inter- and intra-observer reliabilities were calculated using intra-class correlation coefficient, weighted kappa and percentage agreement. Percentage agreement of Laredo classification was about 50% for all groups (residents, seniors and pediatric orthopedists); intra-observer reliabilities were excellent, excellent and fair, respectively. Inter-observer reliability of Laredo classification for each set was found to be excellent for all groups. Length of experience did not correlated significantly with the level of intra-observer agreement. As a conclusion, our results showed that Laredo’s arthrographic classification system’s intra-observer reliability is at least at a fair level and inter-observer reliability is at an excellent level. We believe that this classification system is valuable for an orthopedic surgeon who deals with the treatment of Perthes disease.

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Acknowledgements

We thank Asuman Filiz Guzelant for her contribution.

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Affiliations

  1. Department of Orthopaedics and Traumatology, Tepecik Training and Research Hospital, İzmir, Turkey

    Serkan Erkus, Ali Turgut & Onder Kalenderer

  2. Ege University School of Medicine ARGEFAR, İzmir, Turkey

    Kivanc Yuksel

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  1. Serkan Erkus
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  2. Ali Turgut
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  3. Onder Kalenderer
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Correspondence to Onder Kalenderer.

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Erkus, S., Turgut, A., Kalenderer, O. et al. Intra- and inter-observer reliability of Laredo classification system in Legg–Calvé–Perthes Disease. Eur J Orthop Surg Traumatol 29, 1043–1047 (2019). https://doi.org/10.1007/s00590-019-02405-7

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Keywords

  • Arthrography
  • Reliability
  • Laredo classification
  • Perthes
  • Children