title: Position of TORP on the stapes footplate assessed with cone beam computed tomography.
abstract: OBJECTIVE
  To improve hearing outcomes of ossiculoplasty with a total ossicular replacement prosthesis (TORP) in ears lacking a footplate superstructure, 3-dimensional computed tomography (3D CT) images were reconstructed to verify the position of the TORP on the footplate and contact between the TORP and the stapes footplate.
  
  
  METHODS
  Retrospective study.
  
  
  METHODS
  University-affiliated tertiary referral center.
  
  
  METHODS
  Six ears of 6 patients who underwent ossiculoplasty with TORP and were followed for greater than 3 years postoperatively.
  
  
  METHODS
  Cone beam CT (CBCT) images.
  
  
  METHODS
  An en face view of the stapes footplate and a volume-rendered 3D image were reconstructed.
  
  
  RESULTS
  The en face view of the stapes footplate showed whether the TORP was centered on the stapes footplate. Volume-rendered 3D CBCT images revealed TORP malpositioning or migration, which were not detected on 2-dimensional CBCT images. In such cases, the TORP shaft was in contact with the wall of the oval window niche or the TORP had moved from the stapes footplate.
  
  
  CONCLUSIONS
  Accurate visualization of TORP location on the footplate is important. Images that accurately show the position of the TORP on the stapes footplate will help improve hearing outcomes.
authors.affiliation: Department of Otolaryngology, Takanoko Hospital, Matsuyama, Ehime, Japan. komori@kochi-u.ac.jp
authors.forename: Masahiro
authors.initials: M
authors.lastname: Komori
authors.forename: Naoaki
authors.initials: N
authors.lastname: Yanagihara
authors.forename: Jun
authors.initials: J
authors.lastname: Hyodo
authors.forename: Shinya
authors.initials: S
authors.lastname: Miuchi
mesh_terms: D000293:Adolescent; D002648:Child; D018424:Cholesteatoma, Middle Ear / Q000601:surgery; D054893:Cone-Beam Computed Tomography; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D021621:Imaging, Three-Dimensional; D008297:Male; D008875:Middle Aged; D009998:Ossicular Prosthesis; D019933:Ossicular Replacement / Q000379:methods*; D012189:Retrospective Studies; D013199:Stapes / Q000000981:diagnostic imaging*; D013201:Stapes Surgery / Q000379:methods*; D016896:Treatment Outcome; D055815:Young Adult