Daily Foot Inspection in SCI: Blister Prevention, Kolhapuri Chappals, and Orthoses

Neuropathic foot complications represent a major source of preventable morbidity in chronic spinal cord injury. Because cutaneous sensation across the L4, L5, and S1 dermatomes is denervated, wheelchair users and limited ambulators receive zero sensory warning when footwear causes friction, when toes catch in wheel spokes, or when rigid orthotic edges dig into bony prominences. Furthermore, the loss of sympathetic autonomic innervation impairs sweat gland function, resulting in severely dry, cracked skin (xerosis) that fissures easily. Developing a disciplined twice-daily foot inspection regimen and selecting safe, protective footwear is essential to prevent chronic osteomyelitis and lower limb amputations.

Domestic and Cultural Indian Realities

In Indian cultural and domestic routines, traditional open footwear, such as Kolhapuri chappals, leather sandals, and rubber flip-flops (hawai chappals), is ubiquitous. However, for an insensate foot, traditional toe-thong chappals are catastrophic. The central leather or rubber post between the first and second toes exerts continuous friction during movement, causing deep interdigital blister lacerations within hours. Furthermore, flaccid or spastic feet slide off open chappals, allowing paralyzed toes to drag along abrasive concrete or catch beneath wheelchair footplates. Patients must transition to enclosed, smooth orthopaedic shoes with wide toe boxes.

Clinical Biomechanics and Neurological Recovery

Neuropathic blister formation follows two mechanical pathways: concentrated normal pressure and repetitive friction shear. In wheelchair users, if footrests are adjusted too high, excessive pressure shifts onto the ischial tuberosities; if adjusted too low, the posterior thigh compresses against the seat edge while the heels hang unsupported. In ambulators wearing rigid ankle-foot orthoses (AFOs), repetitive pistoning of the heel within the plastic shell generates high shear forces over the calcaneus and Achilles tendon. Without sensation to prompt postural adjustments, shear blisters rapidly ulcerate through the thin subcutaneous fat to expose underlying bone.

Functional Movement Analysis and Clinical Assessment

Clinical foot assessment utilizes the 10-gram Semmes-Weinstein monofilament to map loss of protective sensation across ten standard plantar sites. Bony prominences, the medial and lateral malleoli, navicular tuberosity, first and fifth metatarsal heads, and posterior calcaneus, are palpated for induration, erythema, and warmth. Toenails are inspected: improper curved trimming by caregivers frequently causes ingrown toenails (onychocryptosis), creating localized sepsis that triggers severe autonomic dysreflexia in T6 and above injuries.

Targeted Rehabilitation and Functional Independence Protocol

The foot care protocol mandates a twice-daily inspection routine: once in the morning before donning footwear, and once at night before bed. Patients use a shatterproof long-handled inspection mirror or smartphone camera to view the soles and heels. Footwear must feature smooth linings, extra depth to accommodate custom plastazote or EVA insoles, and Velcro strap closures. Wheelchair footplates must be equipped with heel-loops and padded calf straps to prevent feet from slipping backward into the front caster wheels during outdoor propulsion.

Red Flags and Emergency Escalation

Any open blister, fluid-weeping crack, or non-blanching red mark on the foot mandates immediate discontinuation of all footwear and walking orthoses until evaluated by a clinician. In individuals with spinal cord injuries at T6 or higher, an ingrown toenail or hidden plantar blister can trigger severe autonomic dysreflexia. If a foot wound exhibits foul-smelling discharge, black necrotic tissue, or ascending redness and swelling up the calf, transport the patient immediately to an orthopaedic or diabetic foot surgical team to prevent osteomyelitis.

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