Which of the following is an indication for a SMO ( Supra-Malleolar Orthosis )?

• A. Unequal weight distribution, resulting in skin breakdown, foot deformities, or abnormal shoe wear
• B. High blood pressure
• C. Improved ankle stability
• D. Normal subtalar alignment

Answer: (A)

An indication for a Supra-Malleolar Orthosis is when there is uneven weight distribution across the foot that leads to skin breakdown, foot deformities, or abnormal shoe wear. When a child has hindfoot valgus or excessive pronation, the foot doesn't bear and transfer pressure evenly. The SMO supports the foot just above the ankle, helping control subtalar motion and align the midfoot and hindfoot. This realignment reduces excessive inward rolling, spreads pressures more evenly through the sole, and protects the skin from irritation or ulcers while also helping to slow or correct deformity progression.

High blood pressure has no relation to foot alignment or orthotics, so it isn’t an indication. Improved ankle stability can be an outcome of using an SMO but isn’t the primary reason for prescribing it. Normal subtalar alignment wouldn’t require this device, since the orthosis is intended to address abnormal motion or alignment.