From: The effect of posterior lumbar dynamic fixation and intervertebral fusion on paraspinal muscles
 | Area of fatty infiltration on UAS | P value | Area of fatty infiltration on LAS | P value | ||
---|---|---|---|---|---|---|
Preoperative | postoperative | Preoperative | postoperative | |||
K-rod group | 1.91 ± 1.26 | 2.69 ± 1.46 |  | 3.17 ± 1.58 | 4.74 ± 2.27 |  |
PLIF group | 3.20 ± 1.92 | 4.13 ± 2.24 |  | 5.64 ± 1.84 | 8.12 ± 4.02 |  |
Group×Rep |  |  | 0.762 |  |  | 0.429 |
Group |  |  | 0.013* |  |  | < 0.001*** |
Rep | Â | Â | 0.001** | Â | Â | 0.001** |