Purpose of Diabetic Shoes
Diabetic shoes serve two critical purposes: preventing first and recurrent foot ulcers in at-risk patients, and protecting feet from injury that could lead to ulceration, infection, and amputation. These specialized shoes are not intended to heal existing ulcers but rather to reduce plantar pressure and accommodate foot deformities to prevent ulcer development. 1
Primary Prevention Functions
Protection from Injury
- All at-risk diabetic patients must be instructed never to walk barefoot, in socks only, or in thin-soled standard slippers, whether at home or outside. 1
- This fundamental protective measure prevents direct trauma to insensate feet that could initiate ulceration. 1
Prevention of First Ulcers
- Properly fitting footwear prevents both plantar and non-plantar first foot ulcers in at-risk patients. 1
- When foot deformities or pre-ulcerative signs are present, therapeutic shoes with custom-made insoles or toe orthoses should be prescribed. 1
Secondary Prevention: Recurrent Ulcer Prevention
Plantar Pressure Reduction
- For preventing recurrent plantar foot ulcers, prescribe therapeutic footwear that demonstrates at least 30% plantar pressure relief compared to standard therapeutic footwear during walking. 1
- This pressure reduction is the key mechanism by which diabetic shoes prevent ulcer recurrence. 2, 3
- Strong evidence supports rocker soles for reducing peak plantar pressure, and moderate evidence supports custom insoles with metatarsal additions for offloading forefoot pressure. 2
Clinical Effectiveness
- Stock diabetic shoes with rocker-shaped walking soles and shock absorption insoles reduced first-year ulcer relapse rates from 60% (normal footwear) to 15% in high-risk patients with healed ulcers. 4
- Custom orthopedic shoes showed a 38% ulcer incidence over 5 years in patients with severe diabetic foot syndrome, many with prior amputations. 5
Critical Limitations and Caveats
Not for Active Ulcer Healing
- Conventional or standard therapeutic shoes must NOT be used to heal plantar foot ulcers. 1
- Offloading devices (non-removable knee-high walkers or cast boots) are required for ulcer healing, not diabetic shoes. 1
- Meta-analyses show offloading devices increase ulcer healing rates by 39% compared to therapeutic footwear (RR 1.39), with non-removable devices showing even larger effects (RR 1.98). 1
Adherence is Essential
- The effectiveness of diabetic shoes depends entirely on patient adherence—they must actually be worn consistently. 1
- Studies showing effectiveness typically report 89% of patients wearing shoes "always or nearly always." 5
Durability Considerations
- Approximately 25% of custom diabetic shoes require replacement after only 1 year, not the typical 2-year expectation. 5
- Regular monitoring and replacement are necessary to maintain protective effects. 5
Mechanism of Action
Therapeutic diabetic footwear works through:
- Redistributing plantar pressure across a larger contact area to reduce peak pressures at high-risk sites. 2, 3
- Accommodating foot deformities (hammertoes, Charcot deformity, prominent metatarsal heads) to prevent pressure points. 1, 6
- Providing cushioning and shock absorption to reduce repetitive stress during walking. 4
- Rocker sole designs that reduce forefoot loading during gait. 2, 4