Video 4-33. Figure 8 double purse-string suture
This is a variation of the purse-string approach for larger defects. Like the standard purse-string technique, it is designed to either shrink the size of a defect or obviate it entirely, depending on the degree of tension and the size of the defect. It is a niche technique, as it leads to a slight puckering in the surrounding skin, a feature that may be acceptable (and will likely resolve with time) on areas such as the forearms and back but is less desirable in cosmetically sensitive locations such as the face.
Suture choice is dependent in large part on location, though as always the smallest gauge suture material appropriate for the anatomic location should be utilized. On the back and shoulders, 2-0 or 3-0 suture material is effective, and on the extremities and scalp, a 3-0 or 4-0 absorbable suture material may be used. In the unlikely event this technique is used on the face, a 4-0 or 5-0 absorbable suture is adequate. Since the technique requires easy pull through of suture material, monofilament absorbable suture is generally preferable. If suture removal is planned, a monofilament nonabsorbable suture is also an option.
After extensive undermining is performed, a single buried vertically oriented suture is placed at the center of the wound; a set-back dermal suture may be utilized.
Once the wound has been bisected, the wound edge at the far end of one of the nascent round- or oval-shaped wounds, parallel to the incision line, is reflected back.
With the tail of the suture material resting between the surgeon and the far end of the wound, the needle is inserted into the underside of the dermis on the far edge of the wound with a trajectory running parallel to the incision. Generally, this entry point in the dermis should be approximately 3-6 mm set-back from the epidermal edge, depending on the thickness of the dermis and the anticipated degree of tension across the closure. The needle, and therefore the suture, should pass through the deep dermis at a uniform depth. Bite size is dependent on needle size, though in order to minimize the risk of necrosis it may be prudent to restrict the size of each bite. The needle should exit the dermis at a point equidistant from the cut edge from where it entered.
The needle is then grasped with the surgical pickups and simultaneously released by the hand holding the needle driver. As the needle is freed from the tissue with the pickups, the needle is grasped again by the needle driver in an appropriate position to repeat the preceding step to the left of the previously placed suture.
A small amount of suture ...