Wound healing, limb salvage and mortality after limb-salvage treatment in patients with diabetes and end-stage renal disease with limb-threatening ischemia: a systematic review and single-arm meta-analysis

For millions of people living with diabetes, the feet are a constant battleground. High blood sugar can damage nerves, leaving the skin unable to feel pain or injury, while also narrowing the tiny blood vessels that deliver oxygen and nutrients needed for repair. When a small cut or blister goes unnoticed and unhealed, it can turn into a deep, non-healing sore. In the most severe cases, the tissue dies, leading to gangrene. This is a critical situation known as limb-threatening ischemia, where the blood flow is so poor that the limb faces the risk of being lost.

The problem becomes even more complex when diabetes is paired with end-stage renal disease, a condition where the kidneys have stopped working and the patient relies on dialysis to filter their blood. Dialysis is a life-saving treatment, but it brings its own set of challenges. The body's chemistry becomes disrupted, leading to hardened arteries and a weakened immune system that struggles to fight infection or knit tissue back together. For doctors, this creates a difficult dilemma: they must decide whether to attempt aggressive surgery to save the leg or to amputate it to prevent a fatal infection. The stakes are incredibly high, as the patients facing this choice are often older and carry multiple serious health conditions.

Until now, there has been no clear, combined picture of what actually happens to these specific patients after they undergo limb-saving treatments. While doctors have data on diabetic patients in general, the unique group of those who also require dialysis has been largely missing from the big studies that guide medical decisions. Researchers wanted to know: if a doctor tries to save the leg of a diabetic patient on dialysis, how often does the wound actually heal? How often is the leg saved from amputation? And perhaps most importantly, how does this affect the patient's chance of survival?

To answer these questions, a team of researchers from Hainan General Hospital in China conducted a massive review of existing medical records. They did not run a new experiment on patients; instead, they gathered and analyzed data from twenty-six different studies published around the world. These studies covered hundreds of patients who had diabetes, kidney failure requiring dialysis, and severe foot problems. The researchers looked for three specific outcomes: whether the open wounds closed completely, whether the leg was kept (avoiding major amputation), and whether the patient survived for a year after treatment. They used a statistical method to combine all these separate pieces of information into a single, more reliable estimate, effectively creating a larger study out of many smaller ones.

The results paint a picture of a very high-risk situation where success is possible but far from guaranteed. The analysis showed that when these patients undergo treatment to save their limbs, only about half of the wounds heal completely. This means that for roughly one in two patients, the severe sore remains open or fails to close fully, leaving them vulnerable to further complications. However, the story is slightly more optimistic when looking at the limb itself. The researchers found that roughly three out of four patients managed to keep their legs. This suggests that even if the wound does not heal perfectly, the aggressive medical interventions used to restore blood flow are often effective enough to prevent the need for a major amputation.

Yet, the cost of this struggle is measured in lives as well as limbs. The study revealed that within one year of treatment, nearly one-third of these patients passed away from any cause. This high mortality rate serves as a stark reminder that for this group of patients, the threat to their life is often greater than the threat to their leg. The researchers also explored whether the intensity of the dialysis treatment made a difference. Their analysis suggested a trend where patients who were fully dependent on dialysis had lower rates of wound healing compared to those who were not on dialysis, though the data was not strong enough to declare this a definitive rule. The study also noted that the type of surgery used—whether older open bypass methods or newer, less invasive tube-based procedures—did not seem to change the overall success rates significantly in this specific group.

The findings offer a sobering but necessary guide for doctors, patients, and families facing these decisions. The data indicates that while saving the leg is a realistic goal for many, the expectation of a fully healed wound should be tempered, and the risk to life must be weighed carefully. The researchers emphasize that because these patients are so complex, they require a team approach involving kidney specialists, vascular surgeons, and wound care experts working together from the very beginning. They also point out that the current evidence is limited by the fact that most of the original studies were retrospective, meaning they looked back at past records rather than following patients forward in a controlled way. This means the numbers are the best estimates available, but they come with a wide range of uncertainty.

Ultimately, this review provides a clearer map of the terrain for one of medicine's most difficult challenges. It confirms that for patients with diabetes and kidney failure, the path to saving a limb is fraught with obstacles. While the majority of legs can be saved, the journey is often long, the wounds are stubborn, and the risk to the patient's life remains severe. The study concludes that there is no one-size-fits-all solution; instead, every decision must be individualized, balancing the hope of keeping a limb against the reality of a fragile health state. The authors call for better, more consistent tracking of these patients in the future so that medical teams can refine their strategies and offer even better care to this vulnerable population.