(Objective AOCBC-8) Arthritis, Osteoporosis, and Chronic Back Conditions (Objective AOCBC-9) (Objective AOCBC-4) Arthritis, Osteoporosis, and Chronic Back Conditions (Objective AOCBC-6) Arthritis, Osteoporosis, and Chronic Back Conditions (Objective AOCBC-5) (Objective AOCBC-1) (Objective AOCBC-2) (Objective AOCBC-12) (Objective AOCBC-10) (Objective AOCBC-3) (Objective AOCBC-7) (Objective AOCBC-11) 50 to 80% of American adults will experience back pain