Figure 3

After adequate debridement through single-stage PTA surgery, the dislodged cement was identified and removed. A rod was temporarily placed on the contralateral side of the planned allograft insertion to prevent undesired vibration during operation (A). A Kirschner wire was used to measure an adequate length for the allograft (B). An intraoperative fluoroscope was used to make sure that the length was suitable. The Kirschner wire should touch the lower endplate of the upper vertebral body and upper endplate of the lower vertebral body (C). After gently retracting the rod, a well-prepared fibular allograft was inserted carefully through the route between the nerve roots. The rods were used to provide stability after adequate compression (D).