Description
A 30-year-old woman presented to the orthopaedics outpatient department with low back pain (LBP) for 4 weeks, not relieved on medications. She had no known comorbidities. On examination, there was movement restriction of the lower spine and focal right posterior lumbar tenderness. Blood routines showed raised acute inflammatory markers. Imaging work-up included a routine frontal radiograph of the lumbar spine which showed a lumbosacral transition vertebra with enlarged right transverse process (figure 1). Sacroilliac joints appeared normal. Plain MRI of the lumbar spine was performed which revealed lumbosacral transitional vertebra (LSTV) with enlarged transverse process articulating with the sacral ala bilaterally forming diarthroidal joint (Castellvi type IIb) and the subchondral bone of this joint showed T2 short inversion recovery hyperintense signals and hypointense signals on T1-weighted images, which was suggestive of marrow oedema. The intervening cartilage was also hyperintense. There were no signal abnormalities on...
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