ObjectiveTo demonstrate the surgical techniques for transpedicular intravertebral cage augmentation (TPICA) using an expandable cage for Kummell disease, which requires posterior surgical stabilization, and provide the preliminary surgical outcomes. MethodsSix consecutive patients undergoing TPICA surgery using an expandable cage with a minimum 6-month follow-up were evaluated. Radiographic analysis to evaluate the local kyphosis angle (LKA), restoration ratio of anterior vertebral height (RAVH) of the index vertebra, and clinical outcomes including the Oswestry Disability Index (ODI), EuroQol 5-dimension instrument (EQ-5D), and visual analog scale (VAS) for back and leg pain, were compared between the preoperative and final follow-ups. ResultsAll patients showed improvements in all clinical outcomes and were able to walk independently without support at the last follow-up. In radiographic evaluation, the mean preoperative RAVH was 41.2 ± 15.6%, which increased postoperatively to 70.3 ± 20.5% (1.70 times) and 62.4 ± 20.0% at the last follow-up (1.51 times). The mean preoperative LKA was 10.5 ± 14.8 and was corrected to 6.0 ± 10.0 at the last follow-up. A slight loss of correction was observed between the postoperative period and the last follow-up; however, there was no clinical significance. ConclusionsExpandable cages in TPICA may allow easier surgical manipulation for cage insertion around the pedicle entrance, minimizing damage to the fractured vertebral body's endplates while achieving satisfactory height restoration compared to static cages, and may also provide wider indications for TPICA surgery.