title: [Clinical significance and anatomical relationship between the inferior margin of oval window and the endosteum of basal cochlear turn].
abstract: OBJECTIVE
  To investigate the safety range of drilling and fenestration on promontory inferior to the oval window in difficult stapedectomy via anatomical study of the relationship between the inferior margin of oval window and the endosteum of basal cochlear turn.
  
  
  METHODS
  By means of histological sections, the distances between the inferior margin of oval window and different locations of endosteum of basal cochlear turn, the corresponding height of the projecting endosteum and the thickness of promontory bone, on three vertical sections through the anterior, posterior and midpoint of the inferior edge of oval window were measured respectively.
  
  
  RESULTS
  The promontory bone inferior to the posterior point of the oval window was thickest, with an average thickness of about 1.1 mm. The endosteum of basal turn at this portion was lowest, with an average height of 0.2 mm. Furthermore, the shortest distance here between the inferior edge of oval window and the endosteum could be no more than 0.3 mm.
  
  
  CONCLUSIONS
  Relatively safe location of drilling on promontory should be selected on promontory inferior to the posterior point of the oval window, with the direction of drilling outward and downward.
authors.affiliation: Department of Otorhinolaryngology Head and Neck Surgery, SUN Yat-Sen Memorial Hospital, Guangzhou 510120, China.
authors.forename: Yu-bin
authors.initials: YB
authors.lastname: Chen
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Yu
authors.initials: Y
authors.lastname: Si
authors.forename: Zhi-gang
authors.initials: ZG
authors.lastname: Zhang
mesh_terms: D003051:Cochlea / Q000033:anatomy & histology*; D006801:Humans; D010046:Oval Window, Ear / Q000033:anatomy & histology*; D013201:Stapes Surgery