Offloading Diabetic Foot Ulcers: What the Evidence Says About Total Contact Casts, Removable Devices, and Footwear
Plantar diabetic foot ulcers (DFUs) develop and persist largely because of repetitive mechanical stress on insensate skin. Peripheral neuropathy removes the protective pain signal that would normally prompt a person to shift weight or stop walking, allowing abnormal plantar pressure to accumulate at high-risk sites — most commonly the forefoot and midfoot. Redistributing this pressure, a process known clinically as offloading, is considered one of the most important interventions for healing a neuropathic plantar ulcer, yet it remains among the most inconsistently applied elements of diabetic foot care in everyday practice.
Why Offloading Is Central to Ulcer Healing
A 2016 systematic review and meta-analysis published in the Journal of Vascular Surgery, which pooled data from 19 interventional studies and 1,605 patients, found that total contact casting (TCC) produced better healing outcomes than removable cast walkers, therapeutic shoes, or conventional wound care. The same review reported no meaningful advantage of irremovable cast walkers over TCC, and noted that therapeutic footwear and custom insoles reduced ulcer relapse compared with regular shoes (Elraiyah et al., 2016). These findings established the evidentiary basis for regarding non-removable, knee-high offloading devices as a reference standard for plantar forefoot and midfoot ulcers.
Comparing Offloading Devices
Total Contact Casting Versus Removable Cast Walkers
A 2022 rapid review and meta-analysis in BMJ Open Diabetes Research & Care examined five randomized controlled trials comparing fiberglass total contact casting with removable cast walkers in adults with neuropathic plantar foot ulcers. The pooled analysis found that TCC was associated with a shorter time to healing — a mean difference of roughly 5.4 fewer days — than removable cast walkers, a finding supported by trial sequential analysis. The authors cautioned that the overall evidence base remains limited in size and consistency, and called for larger, better-designed trials (Okoli et al., 2022).
Why Non-Removable Devices Tend to Outperform Removable Ones
The consistent theme across the offloading literature is adherence. Removable devices, including cast walkers and offloading shoes, are only effective when actually worn during weight-bearing activity. Because a non-removable device cannot be taken off by the patient, it enforces continuous offloading and largely eliminates the adherence gap that undermines removable alternatives. A French clinical review in La Revue du Praticien emphasized this point directly, noting that off-loading shoes are effective only when worn consistently, and framed clinician-patient engagement around device adherence as central to avoiding preventable infection and amputation (Ha Van, 2019).
International Guideline Recommendations
The International Working Group on the Diabetic Foot (IWGDF) issued a dedicated, GRADE-methodology guideline on offloading in 2023, updating its 2019 practical guidance. The 2023 guideline recommends using a non-removable knee-high offloading device as the first-choice intervention for healing a neuropathic plantar forefoot or midfoot ulcer. Where non-removable offloading is contraindicated or not tolerated, a removable knee-high or ankle-high device is recommended as the second-choice option. If no offloading devices are available, appropriately fitted footwear combined with felted foam is proposed as a third-choice interim measure. For ulcers that fail to heal with non-surgical offloading, the guideline outlines surgical options including Achilles tendon lengthening, metatarsal head resection, joint arthroplasty, and metatarsal osteotomy (Bus et al., 2023). This guidance builds on the broader 2019 IWGDF practical guidelines, which situate offloading as one of several interdependent pillars of diabetic foot management alongside wound care, infection control, and vascular assessment (Schaper et al., 2020).
Despite this strong international consensus, implementation varies widely by region. A comparative analysis of national diabetic foot guidelines across Western Pacific nations found that offloading recommendations showed the lowest concordance with IWGDF guidance of any guideline chapter examined, with only 20% of national recommendations rated similar or partially similar to the international standard (Parker et al., 2019). This gap between guideline evidence and local clinical practice remains a recognized barrier to reducing ulcer-related complications.
Offloading in Charcot Neuroarthropathy
Total contact casting also serves as the accepted standard of care during the active phase of Charcot neuroarthropathy, a condition that shares underlying neuropathic mechanisms with plantar ulceration and carries a similarly high risk of infection, ulceration, and amputation if inadequately offloaded. A 2024 systematic review in SAGE Open Medicine examined whether weight-bearing status during total contact casting affects healing in active Charcot foot. Across five studies comprising 158 patients, the review found that permitting weight-bearing during casting did not appear to negatively affect the healing process, though the authors noted the absence of direct comparative trials between weight-bearing and non-weight-bearing protocols and called for further randomized study (Prem et al., 2024).
Clinical Summary
The cumulative evidence supports non-removable, knee-high offloading devices, particularly total contact casts, as the most effective mechanical intervention for healing neuropathic plantar diabetic foot ulcers, largely because their non-removable design enforces the continuous pressure redistribution that removable devices depend on patient adherence to achieve. Current IWGDF guidance formalizes this hierarchy while providing stepwise alternatives when non-removable casting is not feasible. Despite consistent international recommendations, adoption of best-practice offloading remains uneven across health systems, underscoring a persistent gap between the evidence base and everyday clinical implementation.
References
- Elraiyah T, Prutsky G, Domecq JP, et al. A systematic review and meta-analysis of off-loading methods for diabetic foot ulcers. Journal of Vascular Surgery. 2016;63(2 Suppl):59S-68S. doi:10.1016/j.jvs.2015.10.006
- Okoli GN, Rabbani R, Lam OLT, et al. Offloading devices for neuropathic foot ulcers in adult persons with type 1 or type 2 diabetes: a rapid review with meta-analysis and trial sequential analysis of randomized controlled trials. BMJ Open Diabetes Research & Care. 2022;10(3):e002822. doi:10.1136/bmjdrc-2022-002822
- Ha Van G. Why and how to off-load a diabetic foot ulcer? La Revue du Praticien. 2019;69(6):616-619.
- 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. doi:10.1002/dmrr.3647
- 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. doi:10.1002/dmrr.3266
- Parker CN, van Netten JJ, Parker TJ, et al. Differences between national and international guidelines for the management of diabetic foot disease. Diabetes/Metabolism Research and Reviews. 2019;35(2):e3101. doi:10.1002/dmrr.3101
- Prem R, Vignaraja V, Lewis T, Budair B. Weight bearing versus non-weight bearing total contact cast in the management of active Charcot foot: A systematic review. SAGE Open Medicine. 2024;12:20503121241306957. doi:10.1177/20503121241306957
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