• Cesar A Benetton, Guilherme Cesa, Gabriel El-Kouba Junior, Ana Paula B Ferreira, João Ricardo N Vissoci, and Ricardo Pietrobon.
• Orthopedics and Traumatology Institute (IOT), Joinville, SC, Brazil.
• J Shoulder Elbow Surg. 2015 Mar 1;24(3):358-63.

BackgroundAlthough classification systems of olecranon fractures are important to help choose the best treatment and to predict prognosis, their degree of observer agreement is poorly investigated. The objective of this study was to investigate the intraobserver and interobserver reliability of currently used classification systems for olecranon fractures. Our hypothesis is that the Colton classification presents an acceptable agreement because it is simpler to use; on the other hand, considering the AO classification's complexity, we expect it to reach a lower level of agreement.MethodsRadiographic images of elbow joint fractures were classified according to Colton, AO, Mayo, and Schatzker classification systems. The raters were 8 orthopedic surgeons split into 2 groups with 4 participants each, one with specialists in upper extremity surgery and the other with orthopedic surgeons without a specific focus on upper extremity surgery. This first procedure was the pretest training, aimed at calibrating participants' judgment. Image classification was conducted after all training was completed. After 30 days from the initial rating session, the test was conducted once again following the exact same procedures.ResultsThe Colton classification has substantial intraobserver and interobserver agreement for specialists and nonspecialists. The Schatzker classification revealed a fair agreement for both specialists and nonspecialists. A fair concordance was also found for the Mayo classification. The AO classification demonstrated a moderate rate of agreement for specialists, whereas nonspecialists presented slight intraobserver agreement.ConclusionNo classification system is widely accepted because it can be affected by interobserver variability, which can raise questions about its use in a research as well as in a clinical context.Copyright © 2015 Journal of Shoulder and Elbow Surgery Board of Trustees. Published by Elsevier Inc. All rights reserved.

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