title: Traumatic separation of a type I bipartite patella: a report of four knees.
abstract: Four knees in three patients with traumatic separation of a Type I bipartite patella are reported. Sudden anterior knee pain and an audible pop occurred at the time of the injury and the patients had aching or dull pain before the traumatic episode. Previous aching or dull pain led us to differentiate this type of injury from a usual transverse fracture. A round fracture line seen on the radiographs also led us to differentiate this type of injury from a stress fracture. Accordingly, the diagnosis of a traumatic separation of a Type I bipartite patella was confirmed. This is the first report of a traumatic separation of a Type I bipartite patella to our knowledge.
authors.affiliation: Department of Orthopaedic Surgery, Tohoku University Graduate School of Medicine, Seiryo-machi, Aoba-ku, Sendai, 980-8574 Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Okuno
authors.forename: Takehiko
authors.initials: T
authors.lastname: Sugita
authors.forename: Tomomaro
authors.initials: T
authors.lastname: Kawamata
authors.forename: Masahiro
authors.initials: M
authors.lastname: Ohnuma
authors.forename: Norikazu
authors.initials: N
authors.lastname: Yamada
authors.forename: Yusuke
authors.initials: Y
authors.lastname: Yoshizumi
mesh_terms: D000293:Adolescent; D001265:Athletic Injuries / Q000000981:diagnostic imaging* / Q000628:therapy; D005260:Female; D050723:Fractures, Bone / Q000000981:diagnostic imaging* / Q000628:therapy; D006801:Humans; D008297:Male; D010329:Patella / Q000000981:diagnostic imaging* / Q000293:injuries*; D011859:Radiography