Unless you suture the abdominal flap back down, you have to use drains to absorb the fluid that collects. The fluid will prevent the surfaces from sticking and healing and may form a cavity called a bursa that may require surgery to correct. However drains do not prevent all fluid collection, called seromas, and then the surgeon has to puncture the fluid collection (aspirate the fluid), 1-3 times on average, until no more fluid keeps accumulating. By carefully suturing the abdominal flap back down to the abdominal wall, fluid collection is kept to such a minimum that no seroma can form. Why more surgeons do not use them may be multifactorial, e.g. feeling there is some risk of seroma, thinking that their current technique works for them, so why change? Not wanting to take the extra time, or not wanting to have the added expense involved in taking more time. I have used a drainless tummy tuck for the last five years, and have not had a clinically significant seroma, so this is my method of choice. I originally started with the suturing technique and drains, but there was insufficient fluid in the drain to justify using them, so I evolved to using the suturing technique without drains. The literature supports this: Even with drains or tissue glue there is a a 5-45 % incidence of seroma per the literature. A meta-analysis in the Aesthetic Surgery Journal, Aesthet Surg J. 2017 Mar 1;37(3):316-323. doi: 10.1093/asj/sjw192. Seretis K, Goulis, D, Demiri EC, Lykoudis, EG Prevention of Seroma Formation Following Abdominoplasty: A Systematic Review and Meta-Analysis reviewed all the literature on this topic, and found that "preventive measures" decreased the incidence of seroma four-fold. One of the studies included in the "preventive group" that used only progressive tension sutures, from 2006, showed fluid accumulation between the sutures, detected only on ultrasound. This fluid was not clinically detectable by palpation or inspection and resulted in no need for seroma aspiration or any complication. The total amount of fluid associated with clinical complications including drainage in the other groups was greater than 80 cc, and the total amount of non-clinically detectable fluid in the progressive-tension group was always 80 cc or less. The use of drains plus progressive tension sutures did not change the amount of fluid, so there is really no benefit to using drains plus progressive tension sutures.