Cricoarytenoid joint mobility after chronic vocal cord paralysis

Area of Science:

• Laryngology
• Pathology
• Surgical Anatomy

Background:

• Vocal cord paralysis can result from damage to the recurrent laryngeal nerve.
• Long-term effects on the cricoarytenoid joint and laryngeal muscles are not fully understood.
• Thyroplasty medialization is a surgical option for vocal cord paralysis.

Purpose of the Study:

• To histopathologically examine laryngeal specimens from cases of long-standing paralysis.
• To assess for changes in the cricoarytenoid (CA) joints and intrinsic laryngeal musculature.
• To determine the presence or absence of CA joint ankylosis.

Main Methods:

• Histopathological analysis of eleven whole organ laryngeal specimens (10 human, 1 dog).
• Specimens had a history of unilateral or bilateral paralysis lasting 6 months to 17 years.
• Focus on evaluating the cricoarytenoid joints and intrinsic laryngeal muscles.

Main Results:

• No evidence of cricoarytenoid (CA) joint ankylosis was observed in any specimen.
• Ankylosis, defined as fibrous/osseous obliteration or articular surface degeneration, was absent.
• Intrinsic laryngeal musculature was not detailed in the provided abstract, but CA joint integrity was confirmed.

Conclusions:

• The absence of cricoarytenoid (CA) joint ankylosis in long-standing paralysis is a significant finding.
• This supports the potential efficacy and safety of thyroplasty medialization procedures.
• Further research may explore muscular changes in conjunction with joint integrity.