title: Reply.
authors.affiliation: Paracelsus Medical University, Salzburg, Austria, La Trobe University, Bundoora, Australia and Australian Hip and Knee Institute, Melbourne, Australia.
authors.forename: Adam G
authors.initials: AG
authors.lastname: Culvenor
authors.affiliation: Paracelsus Medical University, Salzburg, Austria.
authors.forename: Anja
authors.initials: A
authors.lastname: Ruhdorfer
authors.affiliation: Paracelsus Medical University, Salzburg, Austria.|Chondrometrics GmbH, Ainring, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Wirth
authors.affiliation: Paracelsus Medical University, Salzburg, Austria.|Chondrometrics GmbH, Ainring, Germany.
authors.forename: Felix
authors.initials: F
authors.lastname: Eckstein