Objective: To explore the therapeutic effect of sternum-hyoid muscle transposition and arytenoid adduction for unilateral vocal cord paralysis (UVCP).
Methods: Included in this study were 19 patients with UVCP lasted for 12 months to 15 years. The surgical technique was as follows. The thyroid cartilage was engaged with a skin hook and gently rotated anteriorly. The lateral-inferior corner of the thyroid cartilage was exposed and the muscular process of the arytenoid was identified. Then, the thyroid lamina on the involved side was parasagittally separated 5 mm off the midline. The inner perichondrium was carefully freed from the overlying thyroid cartilage. The lamina was retracted laterally, and a 3-0 prolene suture was placed through the muscular process and tied to the cricoid cartilage at the origin of the lateral cricoarytenoid muscle. A bipedicled strap muscle flap was then transposed into the space between the lamina and the inner perichondrium. Pre- and postoperative voice evaluations measured mean fundamental frequency, jitter, shimmer, harmonic ratio and maximal phonation time, as well as assessments of voice quality.
Results: Vocal improvement was obtained in 100% (19 of 19) of patients. Immediately after the operation, the ingression could be observed in vocal cord membrane and vocal process, vocal cord volume was amplified. There was a significant difference (P < 0.05) in all parameters (fundamental frequency, jitter, shimmer, harmonic ratio and maximal phonation time) between pre- and postoperative voice evaluations measured mean. There was no significant difference (P > 0.05) in voice evaluations measured mean between 2 months and 12 months after operation in all patients. No major complications were noted in any patient.
Conclusion: Sternum-hyoid muscle transposition and arytenoid adduction for unilateral vocal cord paralysis is simple and convenient, no immune rejection, and the long-term result is stable.
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