Figure 2
The pressure-volume curves during cement injection. (a) In a specimen with a void, the intravertebral pressure remained very low (about 0.3 kPa) until the filling of void is completed. The maximum intravertebral pressure was 1.4 kPa, and the volume of injected cement in this specimen was 4,965Â mm3. (b) In a specimen without a void, the intravertebral pressure rose constantly during cement injection. The maximum intravertebral pressure was 8.7 kPa, and the volume of injected cement in this specimen was 4,611Â mm3.