title: Arthroscopic Treatment of Posterior Ankle Impingement in the Supine Position Using Coaxial Posterior Portals.
authors.affiliation: North District Hospital, Hong Kong SAR, China luithderek@yahoo.co.uk.
authors.forename: Tun Hing
authors.initials: TH
authors.lastname: Lui
keywords: ankle arthroscopy; anterior ankle impingement; endoscopy; os trigonum; posterior ankle impingement