title: The double ACL sign: an unusual bucket-handle tear of medial meniscus.
abstract: Several characteristic magnetic resonance imaging (MRI) signs of meniscal bucket-handle tears are well known and widely used. This case report presents a new MRI sign of a meniscal bucket-handle tear. A 17-year-old boy visited our hospital because of the pain in his left knee. Preoperative MRI on sagittal view showed a tear in the anterior horn of the medial meniscus and a displaced fragment of the medial meniscus in front of the original anterior cruciate ligament (ACL), which looks like another ACL. Under arthroscopic examination, the bucket-handle medial meniscus displaced parallel to the ACL was observed. A longitudinal tear was extended from the anterior horn to the posterior horn of medial meniscus. To our knowledge, this new MRI sign of bucket-handle tear, "the double ACL sign", has not been previously reported. Level of evidence V.
authors.affiliation: Department of Orthopaedic Surgery, Kobe University Graduate School of Medicine, Chuo-ku, Kobe, 650-0017, Japan.
authors.forename: Koji
authors.initials: K
authors.lastname: Takayama
authors.forename: Takehiko
authors.initials: T
authors.lastname: Matsushita
authors.forename: Tomoyuki
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Seiji
authors.initials: S
authors.lastname: Kubo
authors.forename: Masahiro
authors.initials: M
authors.lastname: Kurosaka
authors.forename: Ryosuke
authors.initials: R
authors.lastname: Kuroda
mesh_terms: D000293:Adolescent; D016118:Anterior Cruciate Ligament / Q000473:pathology* / Q000601:surgery; D001182:Arthroscopy / Q000379:methods; D005500:Follow-Up Studies; D006801:Humans; D015601:Injury Severity Score; D007718:Knee Injuries / Q000473:pathology / Q000601:surgery; D008279:Magnetic Resonance Imaging / Q000379:methods*; D008297:Male; D008592:Menisci, Tibial / Q000473:pathology* / Q000601:surgery; D011300:Preoperative Care / Q000379:methods; D018570:Risk Assessment; D012421:Rupture / Q000473:pathology / Q000601:surgery; D000070600:Tibial Meniscus Injuries; D016896:Treatment Outcome