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But this posture makes your pelvis rock forward into an anterior pelvic tilt, which consequently creates an increased lumbar curve (lordosis). Unfortunately, other tissues such as the muscles described above adapt to this posture over time, which contributes to back pain and injury.
Placement of a Harrington rod that extends to the lower spine can cause flat-back syndrome, in which the lumbar spine no longer curves inward but flattens or even bulges outward, a condition called lumbar kyphosis. About 40 percent of patients with Harrington rods develop flat-back syndrome, A.D.A.M. reports. Symptoms include back pain and an inability to stand up straight. People with flat-back syndrome may lean forward or lose hip flexibility.