title: Design-Dependent Calculation of the Prosthesis Length in Malleostapedotomy.
abstract: OBJECTIVE
  The results of a recently published micro-CT study suggested a correlation of the distance between long incus process and stapes footplate and the required prosthesis length in malleostapedotomy. The goal of this study was to test the reliability of that assumption.
  
  
  METHODS
  Rectangular and bent prostheses were tested in 11 cadaveric human temporal bone specimens; 1 of them showed a stapedial artery. Prosthesis length was calculated based on the distance between long incus process and stapes footplate. The rate of acceptable prosthesis insertion into the vestibule was investigated.
  
  
  RESULTS
  In both prostheses designs, the insertion depth into the vestibule did not exceed 1.0 mm. Two prostheses did not pass the footplate level in bent prostheses (18%) and 1 in rectangular prostheses (9%).
  
  
  CONCLUSIONS
  A rough estimation of the required prosthesis length in malleostapedotomy seems possible if the distance between long incus process and stapes footplate is known and a design-dependent equation exists.
authors: Department of Otorhinolaryngology and Head and Neck Surgery, University Medicine, Ernst-Moritz-Arndt-University, Greifswald, Germany holger.kaftan@uni-greifswald.de.
authors: Holger
authors: H
authors: Kaftan
authors: Department of Otorhinolaryngology and Head and Neck Surgery, University Medicine, Ernst-Moritz-Arndt-University, Greifswald, Germany.
authors: Markus
authors: M
authors: Blaurock
authors: Department of Otorhinolaryngology and Head and Neck Surgery, University Medicine, Ernst-Moritz-Arndt-University, Greifswald, Germany.
authors: Silke
authors: S
authors: Kaftan
mesh_terms: D004429:Ear Ossicles / Q000473:pathology / Q000601:surgery; D004867:Equipment Design / Q000379:methods; D006801:Humans; D009998:Ossicular Prosthesis; D019933:Ossicular Replacement / Q000295:instrumentation / Q000379:methods; D010040:Otosclerosis / Q000473:pathology / Q000601:surgery; D017755:Prosthesis Fitting / Q000379:methods; D015203:Reproducibility of Results; D013201:Stapes Surgery / Q000295:instrumentation / Q000379:methods
keywords: malleostapedotomy; otosclerosis; stapedial artery; stapedotomy