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An arch index of 0.30 indicates a low arch, which suggests that the person's foot is more flat than normal. In individuals with low arches, the longitudinal arch support is important for stabilizing the foot structure and providing adequate support during ambulation. This type of support helps to distribute weight evenly across the foot, alleviating stress on the plantar fascia and reducing the risk of pain or injury commonly associated with flat feet.

The longitudinal arch support works by providing cushioning and enhancing the biomechanical function of the foot, making it crucial for individuals with low arches. It helps to maintain a proper foot position, promoting a more efficient gait and reducing the likelihood of conditions such as overpronation.

Other interventions, such as heel lifts, transverse arch support, or metatarsal pads, are more suitable for different foot conditions. Heel lifts would elevate the heel but not specifically address the medial long arch's functionality. Transverse arch support primarily focuses on the width of the foot rather than the longitudinal arch height, and metatarsal pads aim to relieve pressure at the metatarsal heads rather than provide the necessary support for a low arch. Therefore, for a patient with a low arch index, longitudinal arch support is the most appropriate orthotic intervention