About Centra: Centra Healthcare Solutions is a nationwide employment firm focusing on finding you a Physical Therapy Assistant Job, PTA Job, PTA Travel Job, Travel Physical Therapy Assistant Job, Physical Therapist Assistant Job and Travel PTA Job. Some of the techniques that the PTA will use for treating a patient include: massages, electrical stimulation, paraffin baths, hot and cold packs, traction and ultrasound and other assigned exercises.