Trunk rotational strength asymmetry in adolescents with idiopathic scoliosis: an observational study

Table 3 Isometric trunk rotational strength values

	36°		18°		Neutral		-18°		-36°
Pre-Rotation Side	Left/Concave					Right/Convex
Contraction Direction	Left/Concave	Right/Convex	Left/Concave	Right/Convex	Left/Concave	Right/Convex	Left/Concave	Right/Convex	Left/Concave	Right/Convex
Force Arc	Low	High	Low	High			High	Low	High	Low
	Absolute Values
HG (n = 24)	25.8(8.2)	49.7(13.5)	31.2(9.7)	41.4(10.7)	35.9(10.1)	36.7(11.1)	42.9(12.7)	31.1(10)	44.9(12.6)	24.7(7.8)
ISG (n = 14)	19.6(6.9)	42.5(11.8)	24.0(7.5)	38.7(11.6)	30.5(6.8)	35.2(9.8)	38.2(4.6)	28.3(8.7)	41.9(7.4)	22.9(7.2)
p-values <	0.05	ns	0.05	ns	0.05	ns	ns	ns	ns	ns
	Normalized to Lean Body Weight
HG (n = 24)	0.62(.17)	1.18(.26)*	0.74(.21)	1.00(.22)	0.86(.22)	0.88(.25)	1.02(.25)	0.74(.19)	1.08(.30)*	0.59(.17)
ISG (n = 14)	0.50(.16)†††	1.10(.27)	0.59(.19)††	0.99(.22)	0.77(.16)†	0.89(.22)†	0.96(.10)	0.72(.16)††	1.05(.17)	0.57(.16)†††
p-values <	0.05	ns	0.01	ns	ns	ns	ns	ns	ns	ns

Trunk rotational strength presented in absolute values and normalized to Lean Body Weight (Nm/Kg) (with standard deviations) measured at five trunk positions in two contraction directions. If viewed with Figure 2 it illustrates the five trunk positions, i.e. rotated to the left 36° or 18°, neutral position, and rotated to the right 18°, or 36°. Strength values in two contraction directions, left or right for the healthy group (HG) and concave or convex for the idiopathic scoliosis group (ISG), are shown below each position figure. P-values are listed directly below the vales compared between the HG and ISG. Within group significant differences: *, †, ††, ††† = p < 0.05

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