What is the primary technique used in a McDonald cerclage?

The primary technique used in a McDonald cerclage involves a simple purse string suture of nonresorbable material. This procedure is specifically designed to strengthen the cervix in cases of cervical incompetence. During the process, the physician places a suture around the cervix, drawing it tight to provide support and prevent premature dilation.

The choice of nonresorbable material is crucial, as it ensures long-term stability until the pregnancy reaches a more viable stage, usually to term. The purse string technique allows for a tight yet adjustable suture that can be easily removed before or during labor, making it practical for ongoing management of the pregnancy.

This approach stands out because it is straightforward and has historically shown efficacy in preventing pregnancy loss associated with cervical incompetence. Options that suggest a temporary surgical stitch or the use of absorbable sutures do not accurately represent the specific method or material used in a McDonald cerclage. Additionally, the placement of a mesh implant does not pertain to this procedure and is unrelated to the management of cervical incompetence. Thus, the correct answer highlights the specific technique and materials that define the McDonald cerclage method.