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Worsening back pain in pregnancy.

A 28-year-old Chinese woman in her second trimester presented complaining of 4 months of continuous low back pain. She gave a 3-year history of dull back pain, never severe enough to prevent her going to work. The pain, dull in nature, usually came on after prolonged standing and walking. A history revealed a similar exacerbation of her back pain during her first pregnancy 2 years ago. On physical examination, no signs of nerve root compression were detected. Apart from tenderness demonstrated during a stress manoeuvre of the sacroiliac joints, the rest of the physical examination was normal. Plain roentgenograms of her spine and pelvis (Fig) taken before her current pregnancy were retrieved for evaluation. What is she suffering from?