Table 2 Magnetic resonance imaging-based quantitative assessment of oculomotor muscles.
Patients | Paralyzed eye | Non-paralyzed eye | P value |
|---|---|---|---|
n = 60 | |||
SOM Surface (mm²) | 8.40 [5.83–13.34] | 13.49 [10.53–15.59] | < 0.001 |
SOM Area (mm²) | 8.91 [6.01–15.57] | 15.98 [12.63–18.85] | < 0.001 |
IRM Surface (mm²) | 27.16 [22.32–30.85] | 27.50 [22.72–31.59] | 0.442 |
IRM Area (mm²) | 32.73 [26.51–39.22] | 31.95 [26.46–38.38] | 0.916 |
Ratio PSOM/notPSOM | |||
Surface | 0.71 [0.48–0.94] | - | |
Area | 0.66 [0.43–0.95] | 0.573 | |
Ratio PIR/NPIR | |||
Surface | 0.99 [0.90–1.12] | - | |
Area | 0.98 [0.87–1.12] | 0.518 | |
Ratio PSOM/PIR | |||
Surface | 0.34 [0.22–0.46] | - | |
Area | 0.32 [0.20–0.47] | 0.520 | |
Ratio NPSOM/NPIR | |||
Surface | 0.47 [0.39–0.58] | - | |
Area | 0.48 [0.38–0.60] | 0.393 | |
Controls | |||
n = 60 | Right | Left | |
SOM Surface (mm²) | 11.70 [8.80–15.60] | 10.90 [8.80–15.75] | 0.055 |
SOM Area (mm²) | 14.16 [10.32–19.14] | 14.93 [10.81–19.77] | 0.803 |
IRM Surface (mm²) | 27.70 [22.70–34.85] | 28.50 [23.20–37.45] | 0.066 |
IRM Area (mm²) | 32.31 [26.85–41.28] | 34.04 [28.44–41.00] | 0.505 |
Ratio RSOM/LSOM | |||
Surface | 1.04 [0.95–1.14] | - | |
Area | 1.01 [0.90–1.15] | 0.257 | |
Ratio RIR/LIR | |||
Surface | 0.99 [0.90–1.06] | - | |
Area | 0.99 [0.89–1.10] | 0.117 | |
Ratio OS/IR | |||
Surface | 0.43 [0.37–0.51] | - | |
Area | 0.44 [0.38–0.52] | 0.472 | |
Patients vs. controls | |||
n = 120 pairs | Paralyzed eye n = 60 | Control eye n = 60 | |
SOM Surface (mm²) | 8.40 [5.83–13.34] | 11.70 [8.80–15.60] | < 0.001 |
SOM Area (mm²) | 8.91 [6.01–15.57] | 14.16 [10.32–19.14] | < 0.001 |
IRM Surface (mm²) | 27.16 [22.32–30.85] | 27.70 [22.70–34.85] | 0.391 |
IRM Area (mm²) | 32.73 [26.51–39.22] | 32.31 [26.85–41.28] | 0.555 |
Ratio PSOM/Control | |||
Surface | 0.71 [0.48–0.94] | 1.04 [0.95–1.14] | < 0.001 |
Area | 0.66 [0.43–0.95] | 1.01 [0.90–1.15] | < 0.001 |
Ratio PIR/Control | |||
Surface | 0.99 [0.90–1.12] | 0.99 [0.90–1.06] | 0.495 |
Area | 0.98 [0.87–1.12] | 0.99 [0.89–1.10] | 0.842 |
Data are presented as medians (interquartile range [IQR]) for continuous variables and were compared using the Mann-Whitney U test or paired Student’s t-test for comparisons within a given patient (paralyzed side vs. non-paralyzed, or right vs. left side). IRM: inferior rectus muscle; LIR : left inferior rectus muscle; LSOM : left superior oblique muscle; NPIR: inferior rectus muscle on the non-paralyzed side; NPSOM: non-paralyzed superior oblique muscle; SOM: superior oblique muscle; PIR: inferior rectus muscle on the paralyzed side; PSOM: paralyzed superior oblique muscle; RIR: right inferior rectus muscle; RSOM: right superior oblique muscle | |||
