Swivel and rollator walkers are appropriate for patients with lower thoracic lesions in spina bifida; where as, reciprocating gait orthoses are used for a upper lumbar lesion. What type of patients would benefit from A) Front swivel wheels B) two wheel rollator C) four wheel rollator? I am trying to get an better sense of clinically who would from different types of rolaltors. Also, what is the difference between a posterior rollator versus anterior?