[New surgical technics in functional esotropias (the thread operation and classical technics)]

Area of Science:

• Ophthalmology
• Strabismus Surgery

Context:

• Surgical management of functional esotropias has evolved significantly.
• The Fadenoperation by Cüppers is a key procedure for muscular spasms causing convergent squints.
• Classical surgical techniques are still used but with modified approaches.

Purpose:

• To analyze the mechanism of medical rectus recession and Fadenoperation.
• To investigate the effectiveness of Fadenoperation in treating blocking esotropias.
• To identify reasons for incomplete Fadenoperation outcomes and suggest complementary surgical actions.

Summary:

• Medical rectus recession primarily acts through muscular slacking, not modification of the arc of contact.
• Fadenoperation's main mechanism involves changing the arc of contact, with muscle exclusion playing a role.
• While effective for adduction incomitance, Fadenoperation's impact on primary position deviation is less understood.

Impact:

• A statistical report on 143 operated blocking esotropias indicates Fadenoperation alone is often insufficient for complete motor recovery.
• Identifies specific muscular actions needed in conjunction with Fadenoperation for optimal results.
• Provides insights into improving surgical outcomes for complex strabismus cases.