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Abstract
For surgical intervention of unilateral vocal cord paralysis, there are several techniques such as thyroplasty type I, vocal cord injection, and arytenoid adduction. Based on analysis of the glottal gap image and vocal function, when a glottal gap width between both vocal processes is more than 10% of the membranous vocal cord length, postoperative vocal function was not favorable. Simulation of each procedure of thyroplasty type I with an expanded polytetra-fluoroethylene (Gore-tex(R)) implant was undertaken on an excised human larynx. When the cartilage wedge was not removed from the window, medialization of the membranous vocal cord was achieved. When the cartilage wedge was removed, medialization of the vocal process as well as that of the membranous vocal cord was achieved. In a case of functional vocal disorder of immobile vocal cords with aphonia, modified thyroplasty type I presented good vocal function.
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