• Thomas J Vogl, Robert Pflugmacher, Johannes Hierholzer, Gerd Stender, Matthew Gounis, Ajay Wakhloo, Christian Fiebig, and Renate Hammerstingl.
• *Universitaetsklinikum Frankfurt, Frankfurt am Main, Germany †Universitatsmedizin CHARITÉ, Klinik fur Unfall und Wiederherstellungschirurgie, Berlin, Germany ‡Klinikum Ernst-von Bergmann GmbH, Potsdam, Germany §Paracelsus Klinik, Marl, Germany; and ¶University of Massachusetts Medical School, Department of Radiology and Neurological Surgery, Worcester, Massachusetts.
• Spine. 2013 Sep 15;38(20):1730-6.

Study DesignA novel randomized, controlled, unblinded clinical trial comparing 2 procedural interventions for painful osteoporotic vertebral compression fractures.ObjectiveThe primary study objective was to evaluate cement leakage for a cement directed kyphoplasty system (CDKS) with anteriorly biased cement flow and vertebroplasty. The secondary study objective was to compare adjacent level fracture rates and vertebral body height for these 2 intervention methods.Summary Of Background DataCement leakage remains a significant clinical problem associated with vertebroplasty and kyphoplasty procedures. Uncontrolled cement flow in the posterior direction can result in leakage into the vertebral veins or spinal canal, leading to potentially serious clinical complications.MethodsSeventy-seven patients with painful osteoporotic vertebral compression fractures were enrolled. Patients were randomized 2:1 for treatment with CDKS (49 patients, 65 levels) or vertebroplasty (28 patients, 39 levels). Cement leakage was evaluated from radiographs and computed tomographic scans. Three- and 12-month follow-ups included additional radiographs and computed tomographic scans to assess changes in vertebral body height and the incidence of new fractures.ResultsTreatment with CDKS significantly reduced the number of levels with leaks and the total number of leaks per level, as compared with vertebroplasty (P = 0.0132 and P = 0.0012, respectively). Significantly, fewer lateral cortical and spinal canal leaks (posterior leaks) occurred in the CDKS group (P = 0.0050, P = 0.02260, respectively). Three adjacent level fractures occurred in the vertebroplasty group, as compared with 2 in the CDKS group. Vertebral body height maintenance was equivalent.ConclusionCement directed kyphoplasty effectively reduces posterior cement leakage, reducing the risk of leakage related complications.Level Of Evidence2.

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