Validation of three classification systems for posterior malleolus fractures of the ankle.

This study reports the inter-rater and intra-rater reliability for three classification systems for posterior malleolus fractures. Based on definitions by Landis and Koch (Biometrics 33:159-174, 1977), inter-rater reliability was rated as 'moderate' for the Haraguchi and Mason classifications and 'substantial' for the Bartoníček classification. Similarly, the intra-rater reliability was rated as 'substantial' for all three classifications.