Diabetic foot is a complication of diabetes mellitus in which wounds, ulcers and other injuries may develop on the foot and heal poorly. A person may not immediately notice a small crack, callus or cut because of reduced sensation in the feet.

In people with diabetes, foot wounds may take longer to heal because of impaired sensation and reduced blood supply to the tissues. If the wound is deep or developed after surgery, the doctor may use negative pressure wound therapy (NPWT) after cleansing and controlling infection. It helps remove excess fluid from the wound and support the healing process.

In this article, we explain in more detail what diabetic foot is, why these wounds are difficult to heal and when negative pressure wound therapy may be appropriate.

Diabetic Foot: Why Wound Treatment Requires a Comprehensive Approach

Treating wounds associated with diabetic foot syndrome requires addressing several factors that may interfere with healing at the same time. Therefore, simply cleaning the wound and choosing a dressing is not enough. It is necessary to control infection, assess blood supply, reduce pressure on the foot and consider the effects of diabetes on tissue condition.

One of the causes of this condition is diabetic neuropathy, or nerve damage that reduces sensation in the foot. A person may not feel a cut, burn or constant pressure on a particular area. Diabetic angiopathy, or impaired blood supply to the limbs, often occurs alongside neuropathy. As a result, tissues receive less oxygen, which makes recovery more difficult. Infection is another contributing factor that can deepen the damage and requires separate treatment.

Diabetic Foot: Treatment Starts with Identifying the Cause of the Wound

Diabetic foot is a complication of diabetes mellitus in which wounds, ulcers, and other injuries may develop on the foot and heal more slowly. A person may not immediately notice a small crack, callus, or cut because of reduced sensation in the feet.

The characteristics of a wound associated with diabetic foot syndrome may vary depending on how it developed. One of the causes is diabetic neuropathy—nerve damage that reduces the ability to feel pain, pressure or temperature. For example, a patient may continue putting weight on an injured area of the foot without realizing that constant pressure is preventing it from healing.

Another problem is impaired blood supply. When blood flow to the foot tissues is reduced, they receive less oxygen and fewer nutrients needed for recovery. If an infection develops in the wound, the damage may deepen, and the healing process may become more complicated.

Therefore, even a small wound or callus requires attention in people with diabetes. It is important not only to treat the injury itself but also to determine what is preventing it from healing.

How to Treat Leg and Foot Wounds in Diabetes

No single treatment method suits every wound associated with diabetes. Local wound care focuses on cleansing the wound and, when indicated, removing non-viable tissue, controlling drainage, and creating conditions that allow the wound to heal gradually. If an infection is present, it is treated separately. If blood supply is impaired, ischemia must be addressed first. If there is excessive pressure on the foot, the doctor reduces it with special footwear, orthoses, or other offloading devices, depending on the wound's location and condition.

For the patient, this means negative pressure wound therapy can help control a complex wound, reduce drainage, and support the formation of new tissue needed for healing.

Negative Pressure Wound Therapy for Diabetic Foot: Mechanism and Clinical Goals

Negative pressure wound therapy, or NPWT, involves using a specialized system that creates controlled negative pressure within the wound. Through the dressing material, the system removes excess wound exudate and helps control drainage.

One important goal of NPWT is to support the formation of granulation tissue—new tissue that gradually fills the wound defect. In this way, negative pressure wound therapy can help prepare a complex wound for the next stage of treatment, including wound closure or reconstructive surgery.

The practical benefit is that it helps control exudate while supporting new tissue formation. For deep and postoperative wounds, this can be an important part of local wound care when standard wound care is insufficient to optimally control the wound condition.

Limitations of Negative Pressure Wound Therapy in Diabetic Foot Syndrome

Negative pressure wound therapy is not suitable for every wound. Before using it, the doctor assesses the wound condition, blood supply, infection, and risk of bleeding. If problems interfere with healing, they must be addressed first.

At the same time, the use of NPWT depends on the wound type. For postoperative wounds and ulcers that developed without surgical intervention, the doctor assesses the indications for negative pressure wound therapy and determines whether it is appropriate in the particular case. Therefore, NPWT is not a universal treatment for every wound associated with diabetic foot. Its place in treatment depends on the specific situation and the overall wound-healing strategy.

How to Assess the Effectiveness of NPWT in Diabetic Foot

Clinicians assess the effectiveness of negative pressure wound therapy by monitoring wound progression. The doctor monitors wound area and depth, drainage amount and characteristics, granulation tissue condition, signs of infection, and the condition of the surrounding skin.

Positive progress may include a gradual reduction in the wound defect, formation of healthy granulation tissue, and decreased wound drainage. Clinicians also assess blood supply to the foot and adherence to offloading recommendations. If the wound does not show the expected improvement or signs of deterioration appear, the doctor reassesses the treatment strategy and changes the approach if necessary.

People with diabetes should not wait until a small foot wound becomes very painful or increases in size. Because of reduced sensation, an injury may go unnoticed, and impaired blood supply can slow healing. If a wound is deep, infected, does not heal or develops after surgery, medical attention is necessary. After assessing the wound, a specialist will determine whether standard wound care is sufficient or whether to add NPWT to treatment.