x-ray of lumbosacral spine: bony ankylosis of posterior elements at L1-L2
x-ray of lumbosacral spine: bony ankylosis of posterior elements at l1-l2
x-ray of lumbosacral spine: bony ankylosis of posterior elements at L1-L2
x-ray of lumbosacral spine: bony ankylosis of posterior elements at l1-l2