Pressure relief, or offloading, is one of the most decisive yet frequently underused elements of diabetic foot ulcer care. In a person with peripheral neuropathy, the protective sensation that would normally prompt someone to shift their weight or rest a sore foot is diminished or absent. Repetitive mechanical stress then concentrates on a small area of skin—typically under the metatarsal heads or the great toe—until tissue breaks down and a plantar ulcer forms. Because that same unfelt pressure continues with every step, no wound dressing, antibiotic, or advanced biologic can heal a plantar ulcer efficiently while the mechanical cause is left uncorrected. This article reviews what the peer-reviewed literature from the past decade says about which offloading strategies work, why device selection and patient adherence matter so much, and where clinical practice still diverges from the evidence.
Why Offloading Sits at the Center of Ulcer Healing
The International Working Group on the Diabetic Foot (IWGDF), which has issued evidence-based guidance since 1999, identifies mechanical offloading as a cornerstone of treatment for plantar diabetic foot ulcers, alongside management of infection and vascular disease. In the IWGDF framework, relieving pressure at the ulcer site is not an adjunct to healing—it is a prerequisite. The group’s systematic-review methodology, updated for its 2023 guidelines using the GRADE evidence-to-decision framework, consistently ranks non-removable knee-high devices above other options for healing non-infected, non-ischemic plantar forefoot ulcers.
The Evidence for Non-Removable Devices
A 2024 meta-analysis of randomized controlled trials, conducted to inform the Italian guidelines on diabetic foot syndrome, quantified these effects. Pooling data across trials, any plantar offloading device was associated with higher odds of ulcer healing than no offloading (odds ratio 3.13). More importantly, a total contact cast (TCC) or a non-removable knee-high walker produced significantly higher healing rates than other, removable offloading devices (odds ratio 2.64). The same analysis found that surgical offloading of an active ulcer—procedures that structurally reduce pressure at the wound—combined with post-operative offloading achieved higher healing rates than offloading devices alone (odds ratio 6.77), though this applies to selected cases.
The advantage of non-removable devices is largely mechanical and behavioral: because the patient cannot take the device off, the ulcer is protected during every step taken throughout the day, not only when the person chooses to wear a device.
Adherence: The Hidden Variable
Removable devices depend on the patient wearing them consistently, and real-world adherence is often modest. A randomized clinical trial comparing a removable walker with a cast-shoe reported a 24-week healing rate of 81% in the walker group versus 62% in the cast-shoe group, but mean adherence was only about 55% and 46%, respectively. The investigators found that ulcer healing was significantly associated with better adherence, a lower SINBAD wound-severity score, absence of infection and ischemia, smaller and more superficial wounds, and better glycemic control. Adherence, initial wound severity, and the degree of wound-area reduction at four weeks emerged as the strongest predictors of outcome—with early area reduction serving as a useful clinical checkpoint for whether current management is working.
A Persistent Gap Between Evidence and Practice
Despite consistent guidance, gold-standard devices remain underused. A survey of Swedish prosthetic and orthotic clinics found that 86% of practitioners treated plantar neuropathic forefoot ulcers with modified off-the-shelf footwear combined with insoles—an approach the IWGDF specifically recommends against as a primary healing device—while only 20% provided a total contact cast and none used a non-removable knee-high walker. Many practitioners were unaware that TCC and non-removable knee-high walkers are considered the gold standard. In other words, the observed pattern of care was nearly the opposite of what the evidence supports, driven in part by knowledge gaps as well as practical concerns about casting time and complexity.
Newer TCC systems aim to reduce those barriers. One case series described a TCC system that could be applied in roughly seven minutes and allowed immediate ambulation, with 18 of 20 wounds (90%) healing in a mean of about 22 days—illustrating that some historical objections to casting are being addressed by design improvements, even if larger controlled data are still needed.
Clinical Takeaways
The literature of the past decade points in a consistent direction. Offloading is essential to plantar diabetic foot ulcer healing, and non-removable knee-high devices—the total contact cast and non-removable walkers—offer the most reliable pressure relief and the strongest healing evidence for appropriate, non-infected, adequately perfused wounds. Removable devices can work well but hinge on consistent wear, making adherence a central determinant of success. Early wound-area reduction, wound severity scoring, and control of infection, ischemia, and blood glucose all influence outcomes and should be assessed alongside the choice of device. Finally, a well-documented gap between guideline recommendations and everyday practice suggests that wider awareness of gold-standard offloading—and of the newer, faster casting systems that make it more practical—remains an important opportunity to improve healing and reduce the downstream risk of infection and amputation.
References
- Schaper NC, van Netten JJ, Apelqvist J, Bus SA, Hinchliffe RJ, Lipsky BA. Practical Guidelines on the prevention and management of diabetic foot disease (IWGDF 2019 update). Diabetes/Metabolism Research and Reviews. 2020;36(Suppl 1):e3266.
- Bus SA, Monteiro-Soares M, Game F, van Netten JJ, Apelqvist J, Fitridge R, Senneville E, Schaper NC. Standards for the development and methodology of the 2023 IWGDF guidelines. Diabetes/Metabolism Research and Reviews. 2023;40(3):e3656.
- Gauna C, Romeo F, Scatena A, Miranda C, Uccioli L, Vermigli C, et al. Offloading systems for the treatment of neuropathic foot ulcers in patients with diabetes mellitus: a meta-analysis of randomized controlled trials for the development of the Italian guidelines for the treatment of diabetic foot syndrome. Acta Diabetologica. 2024;61(6):693–703.
- Khalifa WA, Argoon SA, AbdEllah-Alawi MH. Determinants of healing of diabetic foot ulcer comparing two offloading modalities: a randomized prospective study. The Foot (Edinburgh). 2023;56:102016.
- 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.
- Liden B. Total Contact Cast System to Heal Diabetic Foot Ulcers. Surgical Technology International. 2017;30:71–76.
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