Morphological analysis of isolated hemivertebra: radiographic manifestations related to the severity of congenital scoliosis

Table 4 The outpatient follow-up data of 66 patients with isolated hemivertebra

Variables	Width of hemivertebra			Lateral height ratio^a			Number of the positive parameters^b
Variables	Within (n = 47)	Across (n = 19)	P value^#	< 0.9 (n = 33)	≥ 0.9 (n = 33)	P value^#	0 to 1 (n = 42)	2 to 3 (n = 24)	P value^#
Age at diagnosis (years)	6.1 ± 4.2	6.5 ± 3.9	0.859	7.1 ± 4.0	5.3 ± 4.1	0.087	6.7 ± 4.0	5.3 ± 4.2	0.135
Duration of follow-up (years)	2.3 ± 1.4	2.0 ± 1.3	0.332	2.3 ± 1.4	2.2 ± 1.3	0.802	2.6 ± 1.4	1.8 ± 1.2	0.070
Cobb angle of scoliosis (°)
Initial visit	32.3 ± 8.8	43.2 ± 13.9	0.002	32.7 ± 7.3	38.3 ± 14.2	0.138	33.5 ± 8.6	39.0 ± 15.0	0.176
The latest follow-up	39.9 ± 10.5	52.1 ± 16.9	0.001	39.4 ± 7.5	47.4 ± 17.1	0.135	40.8 ± 10.8	48.1 ± 17.0	0.088
Total progression	7.6 ± 4.3	8.9 ± 5.9	0.272	6.7 ± 3.1	9.2 ± 5.8	0.058	7.3 ± 4.4	9.1 ± 5.3	0.045
Annual progression	3.4 ± 1.3	5.2 ± 2.4	0.004	3.4 ± 1.5	4.5 ± 2.0	0.005	3.3 ± 1.3	5.0 ± 2.2	< 0.001

Data are presented as mean ± standard deviation or number of patients (percentage).
^aTwice the convex lateral height of hemivertebra divided by the summation of the convex lateral height of proximal and distal adjacent vertebra. ^bComprising the three morphological parameters of hemivertebra: width across the midline, b lateral height ratio ≥ 0.9 and posterolateral position.
^#Calculated with Student’s t-test and Mann-Whitney U test as appropriate

ISSN: 1471-2474