Clinical efficacy and safety of electronic flexible endoscope-assisted minimally invasive-transforaminal lumbar interbody fusion and conventional open transforaminal lumbar interbody fusion in the treatment of single-segment lumbar degenerative disease: a retrospective study
This retrospective study of 76 patients demonstrates that electronic flexible endoscope-assisted minimally invasive transforaminal lumbar interbody fusion (MIS-TLIF) offers comparable long-term clinical outcomes to conventional open TLIF for single-segment lumbar degenerative disease, while providing advantages such as reduced blood loss and faster early recovery at the cost of longer operative time, increased fluoroscopy exposure, and a steeper learning curve.
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
The human spine is a remarkable engineering feat, a flexible column of bones that supports our weight while allowing us to move, twist, and bend. Yet, when the soft cushions between these bones wear down or the bones themselves shift out of alignment, the result can be severe pain, numbness, and a loss of mobility. For decades, surgeons have treated these degenerative conditions by opening the back, moving muscles aside to reach the spine, and fusing the vertebrae together with screws and cages. While effective, this traditional approach requires cutting through significant amounts of muscle and tissue, which can lead to long recovery times and lingering back pain. In recent years, the medical community has sought ways to achieve the same stability without causing as much trauma, leading to the development of minimally invasive techniques that use smaller incisions and specialized tools to reach the spine through natural gaps in the muscle.
A team of researchers at Zhejiang Chinese Medical University and Hangzhou First People's Hospital recently set out to test a new variation of this minimally invasive approach. They focused on a specific surgical method called transforaminal lumbar interbody fusion, which is used to treat single-level degenerative disease in the lower back. The standard version of this procedure involves a large incision down the center of the back, where muscles are stripped away to expose the spine. The researchers wanted to see if they could improve upon the existing minimally invasive methods by using a new tool: an electronic flexible endoscope. Unlike the rigid, straight tubes used in many current surgeries, this new device is a thin, flexible camera that can bend, allowing the surgeon to see around corners and into tight spaces without needing to cut away as much tissue. The team compared patients who received this new flexible endoscope-assisted surgery against those who underwent the traditional open surgery to see which method offered better results in terms of pain relief, recovery speed, and safety.
The study involved 76 patients who had been suffering from single-level lumbar degenerative disease, such as a herniated disc or spinal stenosis, and had not found relief through conservative treatments. The patients were divided into two groups. One group of 40 patients underwent the new flexible endoscope-assisted minimally invasive surgery, while the other group of 36 patients received the conventional open surgery. Both groups underwent the same fundamental procedure: removing the damaged disc, cleaning the space between the vertebrae, and inserting a cage filled with bone graft to fuse the two vertebrae together, all secured with screws. The only major difference was how the surgeon accessed the spine and visualized the work area. In the new technique, the surgeon made a small two-centimeter incision and used a flexible camera to navigate the narrow channel, whereas the traditional group required an eight-to-ten-centimeter incision to fully expose the area.
The results showed that the new technique offered distinct advantages in the immediate aftermath of surgery. Patients in the flexible endoscope group lost significantly less blood during the operation and were able to leave the hospital much sooner, staying for an average of roughly five and a half days compared to nearly nine days for the open surgery group. In the early weeks following the procedure, these patients also reported less pain in their lower backs and felt less disabled in their daily lives. By the one-month and three-month marks, the minimally invasive group had significantly lower pain scores and better functional outcomes than the open surgery group. This suggests that the smaller incision and the reduced damage to the surrounding muscles allowed for a faster and more comfortable initial recovery.
However, the new method was not without its trade-offs. The surgeries using the flexible endoscope took longer to perform, averaging about 183 minutes compared to 141 minutes for the open procedure. The surgeons also had to rely on X-ray imaging more frequently to guide the instruments, resulting in longer exposure to fluoroscopy time. Despite these longer operative times, the study found that the long-term results were essentially the same for both groups. By six months and one year after the surgery, the difference in back pain and disability scores between the two groups had disappeared, with both groups showing significant improvement. The fusion rate, which measures whether the bones successfully grew together, was perfect at 100 percent for both groups. Furthermore, the rate of complications, such as nerve injury or infection, was similar in both groups, indicating that the new technique was just as safe as the traditional method, provided the surgeon was skilled enough to handle the more complex tools.
The researchers concluded that this flexible endoscope-assisted approach is a viable and effective alternative to traditional open surgery for single-level lumbar degenerative disease. It offers a clear benefit for patients in the early stages of recovery, with less blood loss, shorter hospital stays, and quicker relief from back pain. Yet, the study also highlighted that this technique is not a magic bullet that eliminates all difficulties. It requires a longer time in the operating room and demands a steep learning curve for surgeons, who must master the use of a flexible camera within a narrow tube. The study did not find this method suitable for more complex cases involving multiple levels of the spine or severe instability, and the authors noted that the technology is still evolving. For now, the findings suggest that for carefully selected patients with single-level problems, this new way of looking inside the spine can lead to a smoother road to recovery without sacrificing the long-term success of the fusion.
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