Among the many interventions used to heal a diabetes-related foot ulcer, one stands out as arguably the most important: taking pressure off the wound. Most diabetic foot ulcers occur on the sole of the foot, where repetitive mechanical stress during walking prevents fragile tissue from closing. Removing or redistributing that stress — a practice clinicians call offloading — is central to healing. Understanding how offloading works, and why some methods outperform others, helps explain why footwear and casting decisions carry such weight in diabetic foot care.
Why offloading matters
Diabetes-related lower-extremity complications are a large and growing global health problem. A Global Burden of Disease analysis estimated that in 2016 roughly 131 million people — about 1.8% of the world’s population — had a diabetes-related lower-extremity complication such as neuropathy, foot ulceration, or amputation, together accounting for an estimated 16.8 million years lived with disability. Foot ulcers are a critical step on the pathway toward infection, hospitalization, and limb loss, and the middle-aged and older adults who most often develop them bear a disproportionate share of the resulting disability.
In people with peripheral neuropathy, the protective sensation that would normally prompt someone to limp or rest is diminished or absent. As a result, they continue to load an open wound without discomfort, and every step reintroduces the very mechanical stress that is preventing the ulcer from healing. This is the core rationale for offloading: if the tissue cannot signal the need to rest, an external device must do the work of protecting it.
What the evidence says about offloading methods
The strongest evidence favors non-removable, knee-high devices, such as a total contact cast or a knee-high walker rendered irremovable. A 2023 systematic review and meta-analysis found that non-removable offloading devices increased the proportion of ulcers healed compared with removable devices (risk ratio 1.24, 95% confidence interval 1.09–1.41), and were also associated with better adherence and fewer infections. Any offloading device, in turn, tended to outperform therapeutic footwear alone for healing plantar ulcers.
A large part of this advantage comes down to adherence. Removable devices only work while they are being worn, and studies consistently show that people wear them for a minority of their daily steps. A device the patient cannot take off guarantees that the foot is protected during every weight-bearing moment — a simple but decisive difference. This insight has driven interest in hybrid designs; one retrospective study of ventral-windowed total contact casts, which allow wound inspection while remaining irremovable, reported a markedly shorter median time to ulcer remission compared with removable casts.
When devices alone are not enough
For some ulcers, particularly those linked to toe deformities or limited ankle motion, offloading devices can be combined with minor surgical procedures. The same body of evidence indicates that pairing a device with a digital flexor tenotomy for toe ulcers, or with Achilles tendon lengthening for forefoot ulcers, can further improve healing and reduce recurrence at the original site — though these procedures carry their own trade-offs, such as the possibility of new lesions developing elsewhere on the foot.
How offloading fits into the wider care plan
The 2023 International Working Group on the Diabetic Foot (IWGDF) offloading guideline sets out a clear hierarchy. For a neuropathic plantar forefoot or midfoot ulcer, the first choice is a non-removable knee-high device. If that is contraindicated or not tolerated, a removable knee-high or ankle-high device is the second choice, and appropriately fitting footwear combined with felted foam is the third. When non-surgical offloading fails to heal a plantar ulcer, surgical options such as tendon lengthening or metatarsal procedures may be considered. This stepwise pathway is meant to match the intensity of the intervention to the wound while keeping the person mobile and safe.
Offloading does not replace the other pillars of care — wound debridement, infection control, management of blood flow, and glucose management all remain essential. It also does not require complete inactivity. A systematic review of exercise in people with foot ulcers found that non-weight-bearing activity did not appear to harm healing and may offer modest benefit, alongside broader gains for cardiovascular and psychological health. The goal is to redistribute load away from the wound, not to eliminate all movement.
Key takeaways
Offloading is a cornerstone of diabetic foot ulcer healing because it addresses the mechanical cause of most plantar wounds. Current evidence and international guidelines point to non-removable knee-high devices as the most effective first-line option, largely because they ensure the foot is protected at every step. Removable devices, therapeutic footwear, and felted foam remain useful when non-removable casting is not feasible, and selected surgical procedures can help when conservative offloading stalls. Because neuropathy silences the body’s own warning system, consistent pressure redistribution — integrated with wound care, vascular assessment, and glucose control — remains one of the most powerful tools available for healing ulcers and reducing the risk of amputation.
References
Bus SA, Armstrong DG, Crews RT, et al. Guidelines on offloading foot ulcers in persons with diabetes (IWGDF 2023 update). Diabetes/Metabolism Research and Reviews. 2023;40(3):e3647.
Lazzarini PA, Armstrong DG, Crews RT, et al. Effectiveness of offloading interventions for people with diabetes-related foot ulcers: A systematic review and meta-analysis. Diabetes/Metabolism Research and Reviews. 2023;40(3):e3650.
Zhang Y, Lazzarini PA, McPhail SM, et al. Global Disability Burdens of Diabetes-Related Lower-Extremity Complications in 1990 and 2016. Diabetes Care. 2020;43(5):964–974.
Hochlenert D, Fischer C. Ventral Windowed Total Contact Casts Safely Offload Diabetic Feet and Allow Access to the Foot. Journal of Diabetes Science and Technology. 2022;16(1):137–143.
Tran MM, Haley MN. Does exercise improve healing of diabetic foot ulcers? A systematic review. Journal of Foot and Ankle Research. 2021;14(1):19.
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