Table 4 Comparison between the planned required bone volume and the actual results of different disc heights achieved using the bone harvested from decompression
Disc Height (mm) | 8 (n = 18) | 10 (n = 54) | 12 (n = 72) | |||
|---|---|---|---|---|---|---|
Level | L4–5 (n = 8) | L5-S1 (n = 10) | L4–5 (n = 33) | L5-S1 (n = 21) | L4–5 (n = 44) | L5-S1 (n = 28) |
Planned graft fusion area (mm2) | 460.80 ± 52.94 | 415.05 ± 61.32 | 415.81 ± 71.20 | 400.89 ± 57.73 | 431.40 ± 55.12 | 431.19 ± 70.13 |
Actual graft fusion area (mm2) | 645.48 ± 83.62 | 565.13 ± 131.34 | 562.18 ± 111.17 | 540.72 ± 102.53 | 594.37 ± 100.05 | 586.97 ± 100.10 |
P Value | 0.000 | 0.004 | 0.000 | 0.000 | 0.000 | 0.000 |
The ratio of actual fusion area to the total disc endplate (%) | 42.0 | 40.8 | 40.6 | 40.5 | 41.3 | 40.8 |
Planed graft fusion volume (cm3) | 3.68 ± 0.44 | 3.31 ± 0.48 | 4.15 ± 0.72 | 4.01 ± 0.57 | 5.18 ± 0.68 | 5.17 ± 0.85 |
Actual graft fusion volume (cm3) | 5.65 ± 0.96 | 4.62 ± 1.11 | 5.74 ± 1.30 | 5.45 ± 0.98 | 7.11 ± 1.21 | 6.99 ± 1.13 |
P Value | 0.000 | 0.003 | 0.000 | 0.000 | 0.000 | 0.000 |
The ratio of actual fusion volume to the total volume of the disc space (%) | 46.1 | 41.9 | 41.5 | 40.8 | 41.2 | 40.6 |
Bone volume harvested from decompression (cm3) | 3.53 ± 0.57 | 3.64 ± 0.37 | 3.49 ± 0.40 | 3.40 ± 0.40 | 3.54 ± 0.53 | 3.45 ± 0.39 |
Bone weight harvested from decompression (g) | 3.99 ± 0.56 | 4.02 ± 0.39 | 3.89 ± 0.47 | 3.73 ± 0.43 | 3.93 ± 0.52 | 3.81 ± 0.43 |
Minimum required bone volume (cm3) | 2.20 ± 0.44 | 1.83 ± 0.48 | 2.31 ± 0.72 | 2.17 ± 0.57 | 2.97 ± 0.68 | 2.96 ± 0.85 |