Measurement variability of slipped capital femoral epiphysis

R. T. Loder, L. C. Blakemore, F. A. Farley, A. T. Laidlaw

Research output: Contribution to journalArticle

11 Scopus citations


Measurement variability of slipped capital femoral epiphysis (SCFE) is unknown, yet treatment may be dependent upon slip severity. We studied the variability in SCFE measurement using both continuous variables (epiphyseal displacement, slip angle) and discrete variables (mild, moderate, or severe). We selected 48 hips with SCFE having adequate radiographs; each hip was measured on 2 different occasions by 4 different observers. Intra- and inter- observer variability (95% confidence level) was ± 12°and ± 12°for the lateral-epiphyseal shaft angle, ± 16% and ± 17% for AP epiphyseal- metaphyseal displacement, and ± 18% and ± 21% for frog-lateral epiphyseal- metaphyseal displacement. The lateral epiphyseal-shaft angle converted into a discrete category (mild, moderate, severe) was the only SCFE measurement with acceptable reliability for either intra-observer (κ(ω) = 0.80) or inter- observer (κ(ω) = 0.75) variability.

Original languageEnglish (US)
Pages (from-to)33-42
Number of pages10
JournalJournal of Orthopaedic Surgery
Issue number1
StatePublished - Dec 1 1999
Externally publishedYes


  • Inter- observer
  • Intra-observer
  • Measurement variability
  • Slip angle
  • Slip displacement
  • Slipped capital femoral epiphysis

ASJC Scopus subject areas

  • Surgery

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  • Cite this

    Loder, R. T., Blakemore, L. C., Farley, F. A., & Laidlaw, A. T. (1999). Measurement variability of slipped capital femoral epiphysis. Journal of Orthopaedic Surgery, 7(1), 33-42.