CORR Insights®: What Are the Interobserver and Intraobserver Variability of Gap and Stepoff Measurements in Acetabular Fractures?

Ruurd L. Jaarsma

Research output: Contribution to journalComment/debate

Abstract

Gap and stepoff have commonly been used in orthopaedic fracture assessment since Knirk and Jupiter [7] presented their work on distal radius fractures in young adults in 1986. They described a significantly increased (91%) risk of post-traumatic arthritis in incongruent joints at approximately 7 years in patients in whom a step of more than 2 millimeters was identified on the distal radius surface on plain radiographs. Since then, this 2-millimeter cutoff has been used in daily practice for articular fracture fixation, as well as in other smaller and larger joints. Unfortunately, this is often done without support by further research specific to the joint concerned. House and Jupiter [5] revisited the classic paper [7] in 2009 and self-critiqued the lack of interobserver agreement, among other methodologic flaws.

Original languageEnglish
Pages (from-to)2809-2811
Number of pages3
JournalClinical orthopaedics and related research
Volume478
Issue number12
DOIs
Publication statusPublished - Dec 2020

Keywords

  • Commentary
  • Interobserver Variability
  • Intraobserver Variability
  • Gap and stepoff values
  • Gap and stepoff measurements
  • Acetabular Fractures

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