Fig.2

A 69-year-old woman suffered L1 vsOVCF with spinal canal compromise treated with percutaneous kyphoplasty. a The pre-operative kyphotic angle was 33°. b, c Pre-operative CT showed retropulsion of the posterior wall fragment into the spinal canal. d, e The pre-operative MRI displayed high signal intensity in the vertebral body in T2-weighted and short tau inversion recovery (STIR) images. f, g The post-operative X-ray films showed cement distributed well and did not leak. The kyphotic angle was 17°. h, i The post-operative MRI showed reduction of the retropulsed bone fragment from the spinal canal. j The minimal incisions of PKP (black arrows)