Ankle Foot Orthosis Comparative Effect

Inclusion Criteria: * Ages: 18-65 * Sustained a function limiting, below the knee, traumatic lower leg injury that occurred greater than two years ago * Weakness of ankle plantarflexors (\<4/5 on MMT), limited pain free ankle motion (DF\<10deg or PF\<20deg), mechanical pain with loading onto hindfoot/midfoot/forefoot (\>4/10 on verbal numeric pain rating scale), ankle or hindfoot fusion or candidate for ankle or hindfoot fusion, AND/OR a candidate for amputation secondary to ankle/foot impairment * Ability to walk 50 feet without using a cane or crutch * Ability to walk at a slow to moderate pace * Able to read and write in English and provide written informed consent Exclusion Criteria: * Pain \> 8/10 while walking * Ankle weakness as a result of spinal cord injury or central nervous system pathology * Require a knee stabilizing device (i.e. Knee-Ankle Foot Orthosis or Knee Orthosis) to perform daily activities * Surgery on study limb anticipated in the next 6 months * Medical or psychological conditions that would preclude functional testing (ex. severe traumatic brain injury, heart condition, clotting disorder, lung condition, stroke, vestibular disorder) * Nerve, muscle, bone, or other condition limiting function of the contralateral extremity * BMI greater than 45 * Visual or hearing impairment that limit walking ability or limit the ability to comply with instructions given during testing * Pregnancy- Per participant self-report. Due the expected small number of preg…