👉 The term "zygapophysial" is not a well-defined word in medical terminology. It refers to a type of surgical procedure, specifically used for treating conditions such as prolapse and sphincter dysfunction. The specific purpose or context of this term would be difficult to determine without more information about its usage in the medical literature or within the broader context of the field of surgery. If you could provide more details or clarify your question, I'd be happy to help further.