title: Post-operative deformation and extrusion of the discoid lateral meniscus following a partial meniscectomy with repair.
abstract: OBJECTIVE
  The purpose of this study was to investigate the morphology of the discoid lateral meniscus sequentially following a partial meniscectomy with repair using magnetic resonance imaging (MRI).
  
  
  METHODS
  Nine patients with a symptomatic discoid lateral meniscus with a peripheral tear were enrolled in this study, and a partial meniscectomy with repair was performed arthroscopically. An MRI examination was performed 2 weeks after surgery (before weight bearing was permitted) and again 6 months after surgery (when sporting activities could resume). The width, height and distance of the discoid lateral meniscus were measured. The distance was defined as the distance between the edges of the discoid lateral meniscus and the tibia.
  
  
  RESULTS
  The width of the anterior, middle and posterior segments significantly decreased from 2 weeks to 6 months after surgery. The height of the middle and posterior segments significantly increased from 2 weeks to 6 months after surgery, whereas the height of the anterior segment did not significantly change. The distance of the anterior, middle and posterior segments significantly decreased from 2 weeks to 6 months after surgery.
  
  
  CONCLUSIONS
  The discoid lateral meniscus exhibited deformation and extrusion from 2 weeks to 6 months after a partial meniscectomy with repair. Therefore, the function of load transmission might not be maintained appropriately after surgery.
  
  
  METHODS
  IV.
authors.affiliation: Department of Orthopedic Sports Medicine, Hoshigaoka Medical Center, 4-8-1 Hoshigaoka, Hirakata, Osaka, 573-8511, Japan.
authors.forename: Tomohiko
authors.initials: T
authors.lastname: Matsuo
authors.affiliation: Department of Orthopedic Sports Medicine, Hoshigaoka Medical Center, 4-8-1 Hoshigaoka, Hirakata, Osaka, 573-8511, Japan.
authors.forename: Kazutaka
authors.initials: K
authors.lastname: Kinugasa
authors.affiliation: Department of Orthopedic Sports Medicine, Hoshigaoka Medical Center, 4-8-1 Hoshigaoka, Hirakata, Osaka, 573-8511, Japan.
authors.forename: Kousuke
authors.initials: K
authors.lastname: Sakata
authors.affiliation: Department of Orthopedic Surgery, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Tomoki
authors.initials: T
authors.lastname: Ohori
authors.affiliation: Department of Orthopedic Surgery, Osaka University Graduate School of Medicine, 2-2 Yamada-oka, Suita, Osaka, 565-0871, Japan.
authors.forename: Tatsuo
authors.initials: T
authors.lastname: Mae
authors.affiliation: Department of Orthopedic Sports Medicine, Hoshigaoka Medical Center, 4-8-1 Hoshigaoka, Hirakata, Osaka, 573-8511, Japan. hamada-m@umin.ac.jp.
authors.forename: Masayuki
authors.initials: M
authors.lastname: Hamada
mesh_terms: D000293:Adolescent; D000328:Adult; D001182:Arthroscopy / Q000379:methods; D002648:Child; D005260:Female; D006801:Humans; D008279:Magnetic Resonance Imaging; D008297:Male; D008592:Menisci, Tibial / Q000002:abnormalities / Q000000981:diagnostic imaging / Q000601:surgery*; D009139:Musculoskeletal Abnormalities / Q000000981:diagnostic imaging / Q000601:surgery*; D011183:Postoperative Complications / Q000000981:diagnostic imaging*; D000068958:Return to Sport; D013977:Tibia / Q000000981:diagnostic imaging; D016896:Treatment Outcome; D016474:Weight-Bearing; D055815:Young Adult
keywords: Discoid lateral meniscus; MRI; Partial meniscectomy; Peripheral tear; Repair