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.
A retrospective analysis of preoperative and postoperative hearing thresholds.
Tertiary referral center and teaching hospital.
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.
Stapedotomy and insertion of either a standard or a circumferential stapes prosthesis.
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.
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.
Both prostheses showed comparable postoperative hearing outcomes, with the circumferential prosthesis being found to be more stable.
ENT Department, Royal National Throat, Nose & Ear Hospital, London, United Kingdom
Address correspondence and reprint requests to Charlie Huins, F.R.C.S. (ORL-HNS), Professorial Unit, Royal National Throat, Nose & Ear Hospital, 330-332 Gray’s Inn Rd, London WC1X 8DA, United Kingdom; E-mail: firstname.lastname@example.org
The authors disclose no conflicts of interest.