Nitinol-teflon stapes prosthesis improves low-frequency hearing results after stapedotomy

Area of Science:

• Otolaryngology
• Biomaterials
• Hearing Restoration

Background:

• Stapes prostheses are crucial for restoring hearing in cases of otosclerosis.
• Traditional platinum-Teflon pistons require manual crimping, influencing surgical outcomes.
• Nitinol-Teflon prostheses offer shape-memory properties, potentially simplifying implantation.

Purpose of the Study:

• To compare the hearing results of nitinol-Teflon stapes prostheses with traditional platinum-Teflon pistons.
• To evaluate the ease of crimping and adaptability of nitinol prostheses.

Main Methods:

• Retrospective chart review of 188 primary stapes surgeries performed between 1998 and 2009.
• Patients received either a 0.6-mm platinum-Teflon (n=144) or nitinol-Teflon (n=44) piston prosthesis.
• Hearing outcomes were assessed using American Academy of Otolaryngology-Head and Neck Surgery guidelines, focusing on the air-bone gap.

Main Results:

• Overall success in closing the air-bone gap was similar between nitinol (92%) and platinum (96%) groups (p=not significant).
• Nitinol prostheses demonstrated significantly better low-frequency hearing results (250 Hz, 500 Hz) compared to platinum.
• Crimping nitinol prostheses proved difficult in some cases, often requiring manual crimping in addition to laser application.

Conclusions:

• Nitinol-Teflon stapes prostheses did not consistently offer the claimed ease of crimping.
• The superior low-frequency hearing outcomes with nitinol justify further development to improve device usability.
• Both prosthesis types are effective, but nitinol shows potential for enhanced audiological results with design refinement.