title: Clinical factors indicating short nasal bone overlap.
abstract: CONCLUSIONS
  It is important to take adequate precautions when performing septoplasty for elderly patients.
  
  
  OBJECTIVE
  Septoplasty is the treatment of choice for deviation of the nasal septum. Saddle nose is a rare complication caused by damage to the keystone area. In this area, the nasal bone overlaps the upper lateral cartilages, so careful attention is needed when performing septoplasty to patients with short nasal bone overlap. Therefore, the factors associated with short nasal bone overlap were investigated to allow adequate precautions to be taken during surgery.
  
  
  METHODS
  Computed tomography (CT) including the paranasal sinus region was performed in 177 patients. Data including sex, age, and the primary disease were obtained from their medical records. The degree of septal deviation and the bone overlap distance in the midline were measured using CT.
  
  
  RESULTS
  It was found that advancing age was significantly associated with shorter bone overlap distance in the midline. There was no significant association between the degree of septal deviation and nasal bone overlap distance in the midline. Furthermore, there was no significant difference in the overlap distance between nasal sinus diseases and other diseases, and between sexes.
authors.affiliation: a Department of Otolaryngology-Head and Neck Surgery, Tohoku University Graduate School of Medicine , Sendai, Miyagi, Japan.
authors.forename: Yuri
authors.initials: Y
authors.lastname: Nomura
authors.affiliation: a Department of Otolaryngology-Head and Neck Surgery, Tohoku University Graduate School of Medicine , Sendai, Miyagi, Japan.
authors.forename: Kazuhiro
authors.initials: K
authors.lastname: Nomura
authors.affiliation: a Department of Otolaryngology-Head and Neck Surgery, Tohoku University Graduate School of Medicine , Sendai, Miyagi, Japan.
authors.forename: Daiki
authors.initials: D
authors.lastname: Ozawa
authors.affiliation: a Department of Otolaryngology-Head and Neck Surgery, Tohoku University Graduate School of Medicine , Sendai, Miyagi, Japan.
authors.forename: Kazuya
authors.initials: K
authors.lastname: Arakawa
authors.affiliation: a Department of Otolaryngology-Head and Neck Surgery, Tohoku University Graduate School of Medicine , Sendai, Miyagi, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Hidaka
authors.affiliation: a Department of Otolaryngology-Head and Neck Surgery, Tohoku University Graduate School of Medicine , Sendai, Miyagi, Japan.
authors.forename: Yukio
authors.initials: Y
authors.lastname: Katori
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009295:Nasal Bone / Q000002:abnormalities* / Q000000981:diagnostic imaging / Q000601:surgery; D015508:Nasal Obstruction / Q000151:congenital* / Q000000981:diagnostic imaging / Q000601:surgery; D012225:Rhinoplasty / Q000379:methods*; D014057:Tomography, X-Ray Computed; D055815:Young Adult
keywords: Saddle nose; septal deviation; septoplasty; the keystone area