Delayed bone cement displacement following balloon kyphoplasty.

We report a rare case of delayed cement displacement after balloon kyphoplasty in patient with Kümmell's desease. A 78-year-old woman with Kümmell's desease at T12 level received percutaneous balloon kyphoplasty. Two months after surgery, the patient complained of progressive severe back pain. Computed tomographic scans revealed a breakdown of the anterior cortex and anterior displacement of bone cement. Although this complication is very rare, it is likely to occur in treatment of Kümmell's desease accompanying anterior cortical defect.