Table 1.
Details of the computed tomography data on the patients
| Affected | Contralateral | Affected to contralateral | P | ra | |||||
|---|---|---|---|---|---|---|---|---|---|
| Mean | Range | Mean | Range | Mean | Range | ||||
| Hypoplasia | |||||||||
| Acromion as percentage of width | acr/W × 100 | 35.6 ± 5.6% | 24.4 to 48.9% | 32.4 ± 2.4% | 27.8 to 37.5% | 1.10 ± 0.17 | 0.70 to 1.58 | <0.000 | 0.57 |
| Acromion as percentage of height | acr/H × 100 | 36.0 ± 6.6% | 22.4 to 55.6% | 30.5 ± 3.0% | 24.4 to 35.7% | 1.19 ± 0.24 | 0.79 to 1.73 | <0.000 | 0.71 |
| Affected acromion/control acromion | acr/acr | 1.04 ± 0.14 | 0.73 to 1.28 | NS | 0.56 | ||||
| Percent scapular area visible above clavicle | 17.76 ± 14.35% | 0.61 to 53.98% | |||||||
| Percent ratio affected to contralateral scapular area | 86.0 ± 6.4% | 73.1 to 103.3% | −0.57 | ||||||
| Affected to contralateral height ratio | H/H | 0.89 ± 0.10 | 0.69 to 1.11 | <0.05 | −0.55 | ||||
| Affected to contralateral width ratio | W/W | 0.95 ± 0.07 | 0.78 to 1.09 | NS | −0.14 | ||||
| Height to scapular body width | H/w | 1.38 ± 0.20 | 0.95 to 1.81 | 1.40 ± 0.15 | 1.03 to 1.70 | 1.00 ± 0.13 | 0.80 to 1.30 | NS | −0.30 |
| Affected to contralateral scapular body width | w/w | 0.90 ± 0.07 | 0.76 to 1.00 | <0.05 | −0.35 | ||||
| Height to total width ratio | H/W | 1.00 ± 0.13 | 0.68 to 1.26 | 1.07 ± 0.10 | 0.91 to 1.30 | 0.94 ± 0.13 | 0.69 to 1.17 | <0.05 | −0.35 |
| Elevation | |||||||||
| Percent vertical displacement | A/H | −1.6 ± 9.33% | −20.2 to 18.8% | −0.03 | |||||
| Rotation | |||||||||
| Downward/Upward displacement | ^α | 59.7° ± 13.54 | 35° to 83° | 83.9° ± 10.12 | 67° to 111° | −24.2 ± 10.98 | −41 to −6 | <0.000 | −0.65 |
| Internal/External displacement | ^ζ | −35.2° ± 8.50 | 18° to 55° | 40.4° ± 4.93 | 30.5° to 49° | −6.5° ± 7.92 | −20.5° to 17° | NS | −0.22 |
| Anterior/Posterior displacement | ^ϕ | 35.4° ± 7.93 | 20° to 48° | 43.2° ± 8.02 | 25° to 54° | −8.1° ± 4.89 | −18° to 4° | <0.05 | 0.29 |
| Superior scapular angle | ^γ | 45.6° ± 11.50 | 20° to 67° | 58.3° ± 7.36 | 44° to 81° | −12.8° ± 13.09 | −42° to 11° | <0.000 | −0.84 |
| Inferior scapular angle | ^δ | 31.1° ± 16.51 | −2° to 67° | 9.7° ± 7.70 | −3° to 27° | 21.4° ± 17.72 | −9° to 62° | <0.000 | 0.83 |
| Percent subluxation | LM/LN × 100 | 25.7 ± 20.75% | −27.7 to 53.0% | 49.0 ± 3.51% | 41.0 to 56.2 | −23.3 ± 21.21 | −76.0 to 4.6 | <0.000 | −0.80 |
| Glenoscapular angle | ^θ | −20.4° ± 11.34 | −45° to 0° | −2.9° ± 3.74 | −11° to 5° | −17.6° ± 10.88 | −43° to 1° | <0.000 | −0.51 |
The exact measurements (as abbreviated in the second column) are defined in Fig. 2
aCorrelation between ratio or difference of affected to contralateral side value to scapular area visible over clavicle