title: Erratum to: The challenge of treating complex knee instability.
authors.affiliation: University of Pittsburgh Medical Center, Pittsburgh, PA, USA. vmusahl@gmail.com.
authors.forename: V
authors.initials: V
authors.lastname: Musahl
authors.affiliation: Istituto Ortopedico Rizzoli, Laboratorio di Biomeccanica e Innovazione Tecnologica, Bologna, BO, Italy.|Dipartimento Scienze Biomediche e Neuromotorie, Università di Bologna, Bologna, BO, Italy.
authors.forename: S
authors.initials: S
authors.lastname: Zaffagnini
authors.affiliation: University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
authors.forename: R
authors.initials: R
authors.lastname: LaPrade
authors.affiliation: University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
authors.forename: M T
authors.initials: MT
authors.lastname: Hirschmann
authors.affiliation: University of Pittsburgh Medical Center, Pittsburgh, PA, USA.
authors.forename: J
authors.initials: J
authors.lastname: Karlsson