title: The gravity sag view: a simple radiographic technique to show posterior laxity of the knee.
abstract: We introduce a simple radiographic technique of taking a "gravity sag view" to show sagittal laxity secondary to posterior cruciate ligament injury. Side-to-side differences of the tibia-femur step-off measured with these radiographs have proved to be useful parameters for evaluating posterior laxity. This radiographic technique is recommended instead of routine lateral radiographs taken with the knee kept recumbent.
authors.affiliation: Knee and Sports Medicine Service, Department of Orthopaedic Surgery, Osaka University Medical School, Department of Orthopaedic Sports Medicine, Osaka Rosai Hospital, Osaka, Japan. k-shino@osaka-hsu.ac.jp
authors.forename: K
authors.initials: K
authors.lastname: Shino
authors.forename: T
authors.initials: T
authors.lastname: Mitsuoka
authors.forename: S
authors.initials: S
authors.lastname: Horibe
authors.forename: M
authors.initials: M
authors.lastname: Hamada
authors.forename: K
authors.initials: K
authors.lastname: Nakata
authors.forename: N
authors.initials: N
authors.lastname: Nakamura
mesh_terms: D006801:Humans; D007593:Joint Instability / Q000000981:diagnostic imaging* / Q000209:etiology*; D016119:Posterior Cruciate Ligament / Q000000981:diagnostic imaging* / Q000293:injuries*; D011859:Radiography / Q000379:methods