Super-Pulsed Thulium Fiber Laser-Assisted Retrograde Intrarenal Surgery Is a Viable Alternative to Supine and Prone Percutaneous Nephrolithotomy for Solitary 20–30 mm Renal Stones: Clinical Outcomes, Efficacy, and Safety Analysis

Kidney stones are a common and painful problem, affecting a significant portion of the population at some point in their lives. When these hard mineral deposits grow large, specifically between two and three centimeters, they become difficult to manage. For decades, the standard medical approach to removing such large stones has been a procedure called percutaneous nephrolithotomy. In this surgery, doctors make a small incision in the patient's back, insert a tube directly into the kidney, and use tools to break up and remove the stone. While highly effective at clearing the stone immediately, this method carries risks of bleeding and requires a longer hospital stay. Recently, a different approach has gained attention: retrograde intrarenal surgery. Instead of cutting the back, doctors pass a thin, flexible camera up through the natural urinary tract to reach the kidney. For years, this method was reserved for smaller stones, but new laser technology has changed the game. A specific type of laser, known as a thulium fiber laser, can now turn stones into fine dust with high efficiency. This raises a critical question for surgeons: can this less invasive, internal approach now compete with the traditional back-incision surgery for large stones, offering similar success rates with fewer side effects?

A team of researchers set out to answer this question by comparing three different surgical strategies for patients with single kidney stones measuring between two and three centimeters. They looked at the traditional method where the patient lies face down, a variation where the patient lies on their back, and the newer internal approach using the advanced thulium fiber laser. The study involved 260 patients treated at a single medical center over a six-year period. To ensure a fair comparison, all procedures were performed by the same experienced surgeon, and the patients were carefully selected to have similar stone sizes and locations. The researchers tracked how long the surgeries took, how much blood the patients lost, how long they stayed in the hospital, and most importantly, whether the stones were completely gone one month after the operation.

The results revealed a fascinating trade-off between immediate results and overall recovery. When the surgeons looked at the patients the day after surgery, the traditional methods of removing the stone through the back were slightly more successful at clearing the kidney completely right away. However, when the researchers checked the patients again one month later using a low-dose computerized scan, the gap had closed. At that one-month mark, all three groups achieved nearly identical success rates, with roughly ninety percent of patients in every group being completely free of stones. This suggests that while the internal laser method might leave tiny fragments behind initially, the new laser technology is so effective at turning stones into dust that the body naturally flushes these small remnants away over the following weeks, leading to the same final outcome as the more invasive surgeries.

Beyond the final success rate, the differences in the patient experience were stark. The group that underwent the internal laser surgery lost significantly less blood than the groups that had surgery through the back. On average, the blood loss for the laser group was minimal, whereas the other groups experienced a measurable drop in hemoglobin levels. This lower risk of bleeding is a major advantage, particularly for patients who might be on blood thinners or have other health conditions that make surgery risky. Furthermore, the hospital stay for the laser group was shorter. Patients treated with the internal laser left the hospital in about one day, while those with the back-incision surgeries stayed slightly longer. The time spent in the operating room was also comparable between the laser group and the back-incision group where the patient lay on their back, though the traditional face-down position took the longest to complete.

The study concludes that for carefully selected patients with solitary stones of this size, the internal laser surgery is a safe and effective alternative to the traditional back-incision methods. It offers the same high likelihood of being stone-free after one month but comes with the benefits of less bleeding and a quicker return home. The researchers noted that while the laser approach is promising, it is not a magic bullet for every situation, and the choice of procedure depends on the specific details of the patient's case. They emphasized that these findings come from a single center and that larger, randomized studies are needed to confirm these results across different hospitals and patient populations. Nevertheless, the data provides strong evidence that advances in laser technology are expanding the options for patients, allowing them to avoid more invasive surgery without sacrificing the ultimate goal of a stone-free kidney.