Same as ligamentous.

adjective. Composing a ligament; of the nature of a ligament; binding.

adjective. Of, pertaining to, or resembling a ligament

"For those of you who slept through the Podiatry 101 lecture in medical school, this condition is an irritation of the -- ahem -- plantar fascia, aka the plantar aponeurosis -- which is the ligamental structure under the foot that supports the arch."

ligamentous  

binding