Rectangular Advancement Flap for Recurrent Pilonidal Sinus: A Novel 'Bridge Stone' Technique to Eliminate Midline Corner Tension
This study presents a novel "bridge stone" rectangular advancement flap technique that eliminates midline corner tension in recurrent pilonidal sinus surgery, demonstrating high safety, rapid healing, and a low 3.8% recurrence rate in a retrospective analysis of 26 patients.
Original paper licensed under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). This is an AI-generated explanation of the paper below. It is not written or endorsed by the authors. For technical accuracy, refer to the original paper. Read full disclaimer
In the deep fold where the buttocks meet, a small but persistent problem can take hold known as pilonidal sinus disease. It is a chronic condition where tiny tunnels form under the skin, often filled with hair and debris, leading to painful infections and abscesses. While the condition is common, especially among young adults, finding a permanent cure has long been a struggle for surgeons. The core difficulty lies in the location itself: the natural crease of the body creates a pocket where moisture and friction accumulate, making it hard for wounds to heal and easy for infections to return. For decades, the medical community has relied on various surgical methods to remove the diseased tissue, ranging from simple open wounds that heal slowly to complex skin flaps that cover the area. However, even with these advanced techniques, the disease frequently comes back, often in the exact same spot, forcing patients to undergo repeated, frustrating surgeries.
The central challenge in fixing this area is not just removing the infection, but understanding how the shape of the surgical repair affects the outcome. Surgeons have long observed that when they use skin flaps to cover the wound, the corners of that flap often become the weak points where the problem returns. If a sharp corner of the new skin sits right in the middle of the body's natural crease, it creates a point of high tension and a place where hair can easily get trapped again. Recent research has suggested that keeping the edges of a surgical scar at least two centimeters away from this central line is crucial for success. Building on this idea, a team of surgeons at Mersin University in Turkey set out to test a new approach designed specifically to eliminate these dangerous corners entirely.
The researchers developed a novel surgical method they call the "bridge stone" flap, named for the way it distributes tension across the wound like a stone in an arch. In this procedure, the surgeon removes the diseased tissue in a clean, rectangular shape rather than a diamond or oval shape. The key innovation is how the new skin is brought in to cover the hole. Instead of creating a flap with sharp points that might land in the risky middle zone, the team designs a rectangular piece of skin from the side that slides directly over the wound. This creates a straight line of closure right down the center of the body, with no sharp angles touching the midline. By shifting every single corner of the repair well away from the center, the technique aims to remove the stress points that usually cause the disease to flare up again.
To see if this new method worked, the team tracked 26 patients who had suffered from recurring pilonidal disease and had failed previous surgeries. These patients, mostly young men with an average age of 25, underwent the bridge stone flap procedure. The surgery itself was efficient, taking a median of 45 minutes, and most patients were able to leave the hospital the next day. The recovery process was generally smooth, with the wounds fully healing in a median of 14 days. While a few patients experienced minor issues like fluid buildup or temporary swelling, there were no serious complications such as tissue death or large blood clots, which are risks with some other complex flap surgeries.
The most significant finding emerged when the researchers followed the patients for a median of 28 months. In that time, only one patient out of the 26 experienced a return of the disease. This single recurrence happened in a young man who had a complex history of multiple inflammatory conditions and had undergone four previous surgeries, suggesting that his underlying health issues, rather than the surgical technique itself, may have been the cause. For the other 25 patients, the disease did not return, and they reported high levels of satisfaction with the results. The study indicates that by moving all the corners of the repair away from the center and creating a straight, tension-free line, surgeons can significantly reduce the chance of the disease coming back.
The authors emphasize that while these results are promising, they are preliminary and based on a relatively small group of patients. The technique appears to be safe and effective for treating recurrent cases, offering a simpler alternative to the geometrically complex flaps used in the past. However, the researchers note that larger studies with longer follow-up periods are needed to confirm that this advantage holds true over many years. For now, the bridge stone flap offers a compelling new strategy: by respecting the geometry of the body and avoiding the weak points where corners usually fail, it provides a durable solution for a condition that has long been difficult to cure.
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