2. Flat Base
FDI prefer a flat base for their orthotics. This concept is based on individual professional experience of utilising and modifying prefabricated orthoses for over 30 years and treating thousands of patients with lower limb disorders.
A flat base provides a stable platform without providing any unnecessary lateral or medial shift at the subtalar joint, allowing the orthoses to sit perfectly into the shoe. Why would you purchase an orthotic with a curved base if you then have to apply modifications to create a flat stable base?
Additional rearfoot postings also sit better on a flat base and are easily glued into position. The photo shows an FDI Easy Fit Modification glued directly to an FDI orthotic. A perfect fit was achieved straight out of the packet, with no grinding or shaping required.