What surgical procedure is most commonly used to treat spastic senile entropion?

The procedure most commonly used to treat spastic senile entropion is Ziegler cautery. Spastic senile entropion is a condition where the eyelid turns inward due to muscle spasm, which can lead to ocular irritation and damage. Ziegler cautery involves the thermal cauterization of the eyelid to induce a controlled healing response, allowing for the correction of the inward turning of the eyelid through tightening of the surrounding tissues.

The other options, while they may pertain to other ocular conditions or treatments, do not address the specific need for treating spastic entropion. Electrolysis is typically used for hair removal and is not considered an appropriate treatment for entropion. A chalazion procedure relates to the excision or drainage of a blocked gland in the eyelid, whereas pterygium removal deals with the removal of an abnormal growth on the eye surface and does not apply to correcting eyelid malpositions. Therefore, Ziegler cautery is specifically suitable for managing the muscle spasms associated with spastic senile entropion.