A physical therapist examines a 4-year-old born with L3 myel…

A physical therapist examines a 4-year-old born with L3 myelomenigocele. When ambulating short distances without orthotic support, the child demonstrates a mild Trendelenburg gait pattern, weakness of the ankle dorsiflexors, and poorly coordinated knee extension during stance phase. Which orthotic support is MOST appropriate to support functional ambulation?