Table 2.
Atrophy between preoperative and postoperative rectus area and density among all operative approaches
| Surgery laterality | Preoperative | Postoperative | Percent atrophy∗ | P value (atrophy ≠ 0) |
|---|---|---|---|---|
| 6-mo follow-up | ||||
| Area (mm2) | ||||
| Ipsilateral | <.001† | |||
| Mean ± SD | 508.4 ± 217.0 | 412.8 ± 210.2 | 15.8 ± 0.29 | |
| Median (IQR) | 469.3 (346.9 to 623.3) | 372.7 (247.4 to 546.1) | 16.3 (−4.9 to 37.0) | |
| Contralateral | .973 | |||
| Mean ± SD | 511.4 ± 223.1 | 494.1 ± 206.1 | −0.1 ± 0.25 | |
| Median (IQR) | 475.1 (340.4 to 644.7) | 470.7 (330.4 to 616.3) | 1.6 (−8.3 to 12.9) | |
| Density (HU) | ||||
| Ipsilateral | .273 | |||
| Mean ± SD | 30.6 ± 18.5 | 24.5 ± 19.0 | 16.8 ± 1.52 | |
| Median (IQR) | 33.9 (23.3 to 42.1) | 27.7 (16.7 to 37.5) | 17.3 (−10.8 to 40.7) | |
| Contralateral | .209 | |||
| Mean ± SD | 30.8 ± 10.0 | 32.2 ± 15.9 | −29.4 ± 2.31 | |
| Median (IQR) | 33.5 (19.4 to 44.1) | 35.5 (24.6 to 42.2) | 1.0 (−32.3 to 21.3) | |
| 12-mo follow-up | ||||
| Area (mm2) | ||||
| Ipsilateral | <.001∗ | |||
| Mean ± SD | 507.3 ± 209.3 | 440.0 ± 203.1 | 10.9 ± 0.25 | |
| Median (IQR) | 469.2 (351.0 to 618.8) | 373.0 (293.2 to 548.7) | 10.8 (−1.7 to 26.6) | |
| Contralateral | .972 | |||
| Mean ± SD | 505.3 ± 209.4 | 490.9 ± 219.3 | −0.1 ± 0.30 | |
| Median (IQR) | 476.5 (349.4 to 644.7) | 449.4 (349.1 to 605.7) | 3.4 (−5.3 to 13.6) | |
| Density (HU) | ||||
| Ipsilateral | .484 | |||
| Mean ± SD | 32.7 ± 15.4 | 28.9 ± 17.7 | −25.0 ± 3.10 | |
| Median (IQR) | 33.9 (24.9 to 42.1) | 31.1 (20.4 to 38.7) | 13.8 (−17.2 to 31.9) | |
| Contralateral | .130 | |||
| Mean ± SD | 32.4 ± 16.0 | 32.8 ± 15.3 | −37.8 ± 2.15 | |
| Median (IQR) | 34.0 (21.8 to 44.6) | 35.0 (24.6 to 42.6) | 1.3 (−25.4 to 22.1) |
IQR, Interquartile range; HU, Hounsfield units.
∗
Atrophy = (preoperative – postoperative)/preoperative.
†
P value < .05, atrophy is significantly different from 0.