Figure 2.

82-year-old female with lumbar decompression and pedicle screw fixation 8 years ago, with severe lumbar pain since 3 months, especially when changing positions (a-b) Preoperative magnetic resonance imaging showing intravertebral vacuum phenomenon at L2. (c-d) After PVP in another hospital, cleft is not opacified completely, flexion extension lateral film shows L2 is unstable (e-f) After repeated PVP in our hospital, flexion extension lateral film shows L2 is stable. (g-h) After 1-year followup, there is callus along the anterior margin of L1 and L2 with no cement dislodgement