Offloading—the practice of redistributing or removing mechanical pressure from a wound—is widely regarded as the single most important intervention for healing a plantar diabetic foot ulcer. Because peripheral neuropathy blunts protective sensation, many people with diabetes continue to walk on an open wound without pain, exposing the ulcer to repetitive pressure that stalls healing and deepens tissue damage. Understanding how offloading works, and which devices the evidence supports, helps clarify why pressure relief is treated as a cornerstone of diabetic foot care rather than an optional add-on.
Why pressure relief drives healing
A neuropathic plantar ulcer typically forms at a site of concentrated mechanical load, most often under the metatarsal heads or the midfoot. Each step delivers a burst of pressure to the wound bed, disrupting the fragile cellular activity required for tissue repair. Removing that load allows the wound to close. International guidance reflects this: the International Working Group on the Diabetic Foot (IWGDF) describes offloading as “arguably the most important” of the multiple interventions needed to heal a neuropathic plantar foot ulcer, working alongside infection control, vascular assessment, and wound care (Bus et al., 2020).
A hierarchy of offloading devices
Not all offloading is equally effective, and the evidence supports a clear order of preference. The 2019 IWGDF offloading guideline recommends a non-removable, knee-high device—a total contact cast (TCC) or a knee-high walker rendered irremovable—as the first-choice treatment for a neuropathic plantar forefoot or midfoot ulcer (Bus et al., 2020). The reason is partly biomechanical and partly behavioural: a device the patient cannot take off guarantees consistent pressure relief and removes the temptation to walk unprotected.
When a non-removable device is contraindicated or not tolerated, the guideline lists removable knee-high devices as the second choice and removable ankle-high devices as the third. Appropriately fitted footwear combined with felted foam ranks only fourth. The Society for Vascular Surgery, in collaboration with the American Podiatric Medical Association and the Society for Vascular Medicine, reached a consistent conclusion, recommending offloading with a total contact cast or an irremovable fixed ankle walking boot for patients with plantar diabetic foot ulcers (Hingorani et al., 2016).
Evidence on casting techniques
The total contact cast has long been called the gold standard, and reported healing outcomes support its use. A retrospective case series of a streamlined TCC system found that 18 of 20 wounds (90%) healed, in a mean of roughly 22 days (Liden, 2017). Researchers have also explored variations that may ease the practical burdens of casting. A retrospective comparison of a non-removable total contact softcast with a conventional TCC reported similar healing ratios and a shorter mean healing time with the softcast (5.5 versus 8.4 weeks), although wound depth confounded the result and the authors called for a randomized trial (Vierhout et al., 2022).
Offloading is also central to managing Charcot neuroarthropathy, a destructive process of bone and joint breakdown in the neuropathic foot. A cohort study found that offloading initiated in the earliest (stage 0) phase was associated with shorter total contact casting duration, a lower risk of new Charcot events, and a reduced need for reconstructive surgery compared with later offloading (Schoug et al., 2024), underscoring the value of early, sustained pressure relief.
A persistent gap between evidence and practice
Despite consistent recommendations, gold-standard devices remain underused. A survey of Swedish prosthetic and orthotic clinics found that 86% of practitioners treated neuropathic forefoot ulcers with modified off-the-shelf footwear and insoles—an approach guidelines specifically advise against—while only 20% provided a total contact cast and none used a non-removable knee-high walker (Gigante et al., 2023). Limited awareness of which devices qualify as gold standard appeared to contribute to the gap. This disconnect matters because the choice of offloading device measurably influences how quickly, or whether, an ulcer heals.
Key takeaways
Offloading is foundational to healing plantar diabetic foot ulcers, and the evidence points consistently in one direction: non-removable, knee-high devices such as the total contact cast deliver the most reliable pressure relief and the strongest healing outcomes, with removable devices and therapeutic footwear occupying lower tiers of preference. Early offloading is also protective in Charcot neuroarthropathy. Yet guideline-recommended devices remain underutilized in everyday practice, representing a clear opportunity to align routine care more closely with the best available evidence.
References
Bus SA, Armstrong DG, Gooday C, et al. Guidelines on offloading foot ulcers in persons with diabetes (IWGDF 2019 update). Diabetes/Metabolism Research and Reviews. 2020;36(S1):e3274.
Schaper NC, van Netten JJ, Apelqvist J, et al. Practical Guidelines on the prevention and management of diabetic foot disease (IWGDF 2019 update). Diabetes/Metabolism Research and Reviews. 2020;36(S1):e3266.
Hingorani A, LaMuraglia GM, Henke P, et al. The management of diabetic foot: A clinical practice guideline by the Society for Vascular Surgery in collaboration with the American Podiatric Medical Association and the Society for Vascular Medicine. Journal of Vascular Surgery. 2016;63(2 Suppl):3S-21S.
Liden B. Total Contact Cast System to Heal Diabetic Foot Ulcers. Surgical Technology International. 2017;30:71-76.
Vierhout BP, Visser R, Hutting KH, et al. Comparing a non-removable total contact cast with a non-removable softcast in diabetic foot ulcers: A retrospective study of a prospective database. Diabetes Research and Clinical Practice. 2022;191:110036.
Schoug J, Katzman P, Fagher K, Löndahl M. Charcot Foot Offloading in Stage 0 Is Associated With Shorter Total Contact Cast Treatment and Lower Risk of Recurrence and Reconstructive Surgery: A Pilot Study. Diabetes Care. 2024;47(2):252-258.
Gigante I, Sigurjónsdóttir ED, Jarl G, Hellstrand Tang U. Offloading of diabetes-related neuropathic foot ulcers at Swedish prosthetic and orthotic clinics. Diabetes/Metabolism Research and Reviews. 2023;39(4):e3611.
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