An orthotic knee brace for treating unicompartmental osteoarthritis in a knee joint is described. 0 and including an aqueous carboxy functional polymer and a condensation catalyst. A flexible web connects the peripheral edge of the first panel with the peripheral edge of the second panel, and defines an insulation cavity between the first panel and the second panel filled with compressible insulation. The delay signal path has an amount of delay in accordance with a number of stacked inverter delay elements comprising the delay signal path. The locking head may be in a secured configuration upon a single motion or movement of the locking head.