title: Erratum to: Reliability of classification for post-traumatic ankle osteoarthritis.
authors.affiliation: Orthopaedic Hand and Upper Extremity Service, Yawkey Centre, Massachusetts General Hospital, Harvard Medical School and University of Amsterdam Medical School, 55 Fruit Street, Boston, MA, 02114, USA. femke__claessen@hotmail.com.
authors.forename: Femke M A P
authors.initials: FM
authors.lastname: Claessen
authors.affiliation: Orthotrauma Research Centre Amsterdam, Academic Medical Centre Amsterdam, Amsterdam, The Netherlands.
authors.forename: Diederik T
authors.initials: DT
authors.lastname: Meijer
authors.affiliation: Orthopaedic Surgeon, Shoulder and Elbow Unit, Onze Lieve Vrouwe Gasthuis, Amsterdam, The Netherlands.
authors.forename: Michel P J
authors.initials: MP
authors.lastname: van den Bekerom
authors.affiliation: Orthotrauma Research Centre Amsterdam, Academic Medical Centre Amsterdam, Amsterdam, The Netherlands.
authors.forename: Barend D J
authors.initials: BD
authors.lastname: Gevers Deynoot
authors.affiliation: Orthotrauma Research Centre Amsterdam, Academic Medical Centre Amsterdam, Amsterdam, The Netherlands.
authors.forename: Wouter H
authors.initials: WH
authors.lastname: Mallee
authors.affiliation: Orthotrauma Research Centre Amsterdam, Academic Medical Centre Amsterdam, Amsterdam, The Netherlands.
authors.forename: Job N
authors.initials: JN
authors.lastname: Doornberg
authors.affiliation: Department of Orthopaedic Surgery, Academic Medical Centre Amsterdam, Amsterdam, The Netherlands.
authors.forename: C Niek
authors.initials: CN
authors.lastname: van Dijk