A number of substances for paracordal injection have been used in the treatment of unileteral vocal cord paralysis and so on.
The chief reason for vocal disabilities in cases of unilateral vocal cord paralysis or hypogenesis vocalis with bowing is deficient glottal closure for phonation which may be successfully treated with paracordal injection.
Recently new suitable materials were used and discussed, TEFLON by Arnold and SILASTIC (medical grade silicone) by Rubin.
We reported an experience with SILASTIC injected into the unilateral vocal cord paralysis (14 cases) and atrophy of the vocal cord (12 cases).
The result was estimated with phoniatric examinations, such as phonation time, the ratio of phonation time and expiration time, and sound spectrogram etc.
Following problems were discussed and described in this paper.
1) The techniques of injection
2) The points of injection
3) The amount of injecting silicone
4) Indications
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