title: Comparison of Audiometric and Functional Outcomes Between the Standard and Modified 360 Nitinol Shape Memory Stapes Prostheses.
abstract: OBJECTIVE
  To compare audiometric and functional outcomes between two designs of heat-activated self-crimping stapes prostheses-a modified shape memory circumferential nitinol-Teflon piston versus its predecessor-in patients with otosclerosis.
  
  
  METHODS
  A retrospective analysis of preoperative and postoperative hearing thresholds.
  
  
  METHODS
  Tertiary referral center and teaching hospital.
  
  
  METHODS
  One hundred sixty-three consecutive procedures of primary stapes surgery for clinically proven otosclerosis in 108 women and 55 men with an average age of 46 years.
  
  
  METHODS
  Stapedotomy and insertion of either a standard or a circumferential stapes prosthesis.
  
  
  METHODS
  Four-frequency pure-tone average preoperative and postoperative air-bone thresholds were recorded. A secondary outcome measure was stability of the implant, as measured by failure rates.
  
  
  RESULTS
  Success of closure of the air-bone gap to within 10 dB was achieved in 97% and comparable in both groups (original prosthesis, 23.6; standard deviation, 7.3, with the average reduction seen in the circumferential prosthesis group being 22.6, standard deviation, 5.6). All the differences were not statistically significant using two-way analysis of variance. Failure rate for the original piston was 6%, with no failures seen with the circumferential piston.
  
  
  CONCLUSIONS
  Both prostheses showed comparable postoperative hearing outcomes, with the circumferential prosthesis being found to be more stable.
authors.affiliation: ENT Department, Royal National Throat, Nose & Ear Hospital, London, United Kingdom.
authors.forename: Jeremy
authors.initials: J
authors.lastname: Lavy
authors.forename: Charlie
authors.initials: C
authors.lastname: Huins
authors.forename: Sherif
authors.initials: S
authors.lastname: Khalil
authors.forename: Andrew
authors.initials: A
authors.lastname: Hall
authors.forename: Owain
authors.initials: O
authors.lastname: Hughes
mesh_terms: D000328:Adult; D000368:Aged; D000497:Alloys; D001299:Audiometry / Q000379:methods*; D001301:Audiometry, Pure-Tone; D001844:Bone Conduction; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009998:Ossicular Prosthesis; D010040:Otosclerosis / Q000601:surgery; D011138:Polytetrafluoroethylene; D011474:Prosthesis Design; D011475:Prosthesis Failure; D019919:Prosthesis Implantation; D012189:Retrospective Studies; D013201:Stapes Surgery; D016896:Treatment Outcome
chemical_list: D000497:Alloys; C013616:nitinol; D011138:Polytetrafluoroethylene