Offloading Systems for Diabetic Foot Ulcers
This collection carries Integra LifeSciences total contact casting systems, cast boots and application tools, used to offload plantar diabetic foot ulcers by redistributing pressure away from the wound across the whole plantar surface and up the lower leg. The range covers complete TCC systems, individual boots, MEDE-KAST kits and the tools needed to apply and remove them.
The principle behind everything here is simple and frequently underweighted: a plantar ulcer on a foot that keeps being walked on will not close, no matter what dressing is applied to it. Pressure is the cause. A dressing manages the wound surface; offloading removes the force that created it and keeps recreating it.
That is why offloading is generally regarded as the primary intervention for plantar diabetic foot ulcers rather than an adjunct to dressing selection. The wound care aisle solves one half of the problem and the cast solves the other.
→ Part of Wound Care. Also see Advanced Dressings, Foam Dressings and Hydrogel Dressings.
How a Total Contact Cast Works
A total contact cast is moulded to conform closely to the entire plantar surface and lower leg, so load that would concentrate under the ulcer is spread across a much larger contact area and partly transferred up the leg.
Two mechanisms do the work. The close contact across the whole foot means no single point carries disproportionate load, which is what a normal shoe allows to happen at the site of a bony prominence or deformity. And the extension up the lower leg transfers a meaningful share of body weight into the cast wall rather than through the sole.
There is a third factor that gets discussed less and matters as much. Diabetic foot ulcers frequently occur in people with peripheral neuropathy, meaning they cannot feel the wound. Without pain there is no natural limp, no instinctive weight shift, and no reason to stop walking on it. The patient is not being non-compliant; their protective sensation is gone.
Non-Removable Against Removable: The Adherence Question
The strongest practical argument for a total contact cast over a removable walker is that it cannot be taken off.
A removable device only offloads while it is being worn. Studies of adherence with removable devices have repeatedly found that patients wear them for a minority of their daily steps, and the steps taken without it are precisely the ones that keep the ulcer open. Getting up in the night, moving around the house, a quick trip to the door: individually trivial, collectively enough to prevent closure.
A non-removable cast takes that decision out of the equation entirely. Every step is an offloaded step. That is the entire mechanism of its advantage, and it explains why a device that appears less convenient produces better outcomes in practice.
The trade-off is real and should be weighed: the wound cannot be inspected between cast changes, the patient cannot bathe normally, and application requires trained personnel. Whether a non-removable approach is appropriate for a given patient is a clinical decision made against the wound, the infection status, the vascular assessment and the patient's circumstances.
TCC Systems
Complete casting systems supply the components needed for a single application, which removes the assembly and inventory problem that made total contact casting difficult to adopt in general clinics.
Historically, TCC required a clinician skilled in traditional casting and a stock of separate materials, and the application took considerable time. Pre-assembled single-use systems reduced both the skill threshold and the time, which is the main reason the technique became practical outside specialist centres.
The range: DER-TCC21131, DER-TCC23000, DER-TCC23001, DER-TCC23002, DER-TCC23005, DER-TCC23051 and DER-TCC23214.
Further system configurations: DER-TCC24000, DER-TCC24001, DER-TCC24005, DER-TCC24051, DER-TCC24214 and DER-TCC25051.
Specialist configurations: DER-TCC2FCT03, DER-TCC2FCT04, DER-TCC2GSII, DER-TCC2PFC045 and DER-TCC2ULTRS.
MEDE-KAST kits
The MEDE-KAST total contact casting system DER-TCC2MDKKS and the MEDE-KAST DER-TCC2ULTR.
Cast Boots and Sizing
The cast boot is the walking surface over the cast, and it determines gait as well as protecting the cast itself.
Sizing matters for a reason beyond fit. A boot that raises the casted foot without any compensation on the other side creates a leg length discrepancy, and walking with uneven leg lengths puts strain through the hip and back and alters gait on both sides. For a patient who will be in the cast for weeks, that is not a minor consideration, and it is a common reason for secondary complaints during treatment.
Boot options: DER-TCC21100, DER-TCC21114, DER-TCC21116, DER-TCC21124, DER-TCC21126 and DER-TCC24002.
Application and removal tools
The total contact cast tools DER-TCC2VACFLT. Cast removal on a neuropathic foot is a procedure requiring care rather than speed: the patient cannot feel the blade, so the usual protective feedback that stops a cast saw injury is absent. Dedicated tools and trained technique matter more here than in general orthopaedic casting.
Negative Pressure Wound Therapy: What It Is
Negative pressure wound therapy applies controlled sub-atmospheric pressure to a sealed wound through a foam or gauze filler, drawing exudate into a canister and applying mechanical force to the wound bed.
It is used on wounds that are large, heavily exuding, or slow to granulate, and on surgical sites where a closed incision benefits from managed pressure. The mechanisms generally described are removal of exudate and infectious material, reduction of oedema, increased local perfusion, and mechanical deformation of the wound bed that promotes granulation tissue formation.
A working system needs four things: a pump generating and regulating the vacuum, a filler dressing shaped to the wound, an adhesive drape creating an airtight seal, and a canister collecting exudate. The seal is the part that determines whether it works at all, and seal failure over bony prominences, skin folds and near body orifices is the most common practical problem in using NPWT.
NPWT and offloading address different problems and are not alternatives. A diabetic foot ulcer may receive both: NPWT managing the wound bed, a total contact cast removing the pressure that caused it. Whether either is indicated, and in what sequence, is determined by the wound assessment and the treating clinician.
Frequently Asked Questions
Why does offloading matter more than dressing choice for a plantar ulcer?
Because pressure is the cause. A plantar ulcer on a foot that keeps being walked on will not close regardless of what dressing is applied, since the force that created the wound continues to be applied to it. A dressing manages the wound surface; offloading removes the cause. Offloading is generally regarded as the primary intervention for plantar diabetic foot ulcers rather than an adjunct.
How does a total contact cast redistribute pressure?
It is moulded to conform closely to the whole plantar surface and lower leg, so load that would concentrate under the ulcer spreads across a much larger contact area. The extension up the lower leg also transfers a meaningful share of body weight into the cast wall rather than through the sole. Close contact across the whole foot prevents any single point carrying disproportionate load.
Why do patients keep walking on a foot ulcer?
Because they frequently cannot feel it. Diabetic foot ulcers commonly occur in people with peripheral neuropathy, and without pain there is no natural limp, no instinctive weight shift and no reason to stop. This is not non-compliance; the protective sensation that would normally make walking on a wound intolerable is absent, which is precisely why an external device is needed to do that job.
Why is a non-removable cast better than a removable walker?
Because a removable device only offloads while it is being worn, and adherence studies have repeatedly found patients wear them for a minority of their daily steps. The steps taken without it are precisely the ones keeping the ulcer open: getting up in the night, moving around the house, a trip to the door. A non-removable cast makes every step an offloaded step.
What are the drawbacks of total contact casting?
The wound cannot be inspected between cast changes, the patient cannot bathe normally, application requires trained personnel, and a poorly applied cast can itself cause skin damage on an insensate foot. Whether a non-removable approach is appropriate is a clinical decision made against the wound, infection status, vascular assessment and the patient's circumstances.
When is total contact casting not appropriate?
Contraindications generally include active infection requiring frequent inspection or drainage, significant arterial insufficiency, deep abscess or osteomyelitis requiring management, excessive exudate the cast cannot accommodate, and situations where the patient cannot safely manage a cast. This is a general orientation rather than a complete list, and the assessment belongs with the treating clinician who has examined the foot and reviewed the vascular status.
What does a complete TCC system include and why does that matter?
A single-use system supplies the components needed for one application. Historically TCC required a clinician skilled in traditional casting and a stock of separate materials, and application took considerable time, which limited the technique to specialist centres. Pre-assembled systems lowered both the skill threshold and the time, which is the main reason total contact casting became practical in general clinics.
Why does cast boot sizing matter?
Beyond fit, a boot that raises the casted foot without compensation on the other side creates a leg length discrepancy. Walking with uneven leg lengths strains the hip and back and alters gait on both sides, and for a patient in a cast for weeks that produces secondary complaints during treatment. Sizing and any contralateral compensation should be considered together.
Why is cast removal a particular concern on a neuropathic foot?
Because the patient cannot feel the blade. In normal casting, the discomfort of a saw contacting skin is the feedback that prevents injury, and on an insensate foot that feedback is absent. Removal therefore requires care, dedicated tools and trained technique rather than speed, and it is one of the reasons TCC application and removal is kept with trained personnel.
What is negative pressure wound therapy?
NPWT applies controlled sub-atmospheric pressure to a sealed wound through a foam or gauze filler, drawing exudate into a canister and applying mechanical force to the wound bed. It is used on large, heavily exuding or slow-granulating wounds and on some closed surgical incisions. A system requires a pump, a filler dressing, an adhesive drape creating an airtight seal, and a canister, with the seal being what determines whether it works at all.
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