Participants with chronic lower back pain of greater than one month duration will be randomized to receive custom foot orthotics or placebo flat inserts. Both groups will receive chiropractic treatment 5 times over the course of 4 weeks following receipt of orthotics. Subjects and treating doctor will be blind to the insert type. Patients will report present, average, best and worst pain at each visit, and complete a Roland-Morris questionnaire. Secondary outcome measures will be number of fixated vertebral levels identified by motion palpation and challenge and number of muscles testing grade 4 and below from a list of 5 muscles to be tested bilaterally before and after each treatment.