Surface electromyography signal characteristics of lower limb muscles in children with unilateral developmental dysplasia of the hip

Table 2 Comparison of surface electromyography signals of the affected and healthy lower limbs of the 2 groups of children when standing, median (25^th percentile-75^th percentile)

	Closed reduction group					Salter osteotomy group
	Affected side	Healthy side	The ratio of the affected side to the healthy side	Affected side CCR	Healthy side CCR	Affected side	Healthy side	The ratio of the affected side to the healthy side	Affected side CCR	Healthy side CCR
Tensor fasciae latae	3.62 (1.93-6.02)	3.92 (2.11-5.78)	0.91 (0.64-1.23)	0.61 (0.49-0.76)	0.64 (0.52-0.76)	4.66 (2.91-7.51)	3.85 (2.42-6.98)	1.18 (0.80-1.81)	0.68 (0.57-0.81)	0.62 (0.48-0.76)
Gluteus maximus	1.49 (1.21-2.61)	1.75 (1.22-2.52)	0.97 (0.84-1.24)			2.00 (1.47-2.24)	1.96 (1.32-3.81)	1.04 (0.59-1.47)
Rectus femoris	1.92 (1.09-4.74)	2.64 (1.18-3.97)	0.91 (0.80-1.26)	0.25 (0.11-0.44)	0.22 (0.18-0.42)	2.18 (1.60-6.55)	2.31 (1.43-6.85)	0.95 (0.68-1.32)	0.33 (0.15-0.60)	0.36 (0.16-0.54)
Hamstring muscles	6.55 (3.17-13.82)	8.94 (3.37-12.51)	0.94 (0.73-1.37)			5.39 (3.69-12.29)	7.08 (2.25-13.54)	0.99 (0.60-1.31)
Tibialis anterior muscle	4.97 (2.03-10.40)	4.71 (2.01-10.78)	0.99 (0.81-1.23)	0.40 (0.30-0.56)	0.44 (0.32-0.55)	4.98 (3.53-7.32)	4.58 (2.15-8.93)	0.99 (0.81-1.12)	0.47 (0.37-0.60)	0.49 (0.28-0.58)
Musculus gastrocnemius	5.75 (3.20-9.28)	5.60 (3.99-8.47)	0.99 (0.86-1.23)			4.44 (3.53-7.32)	6.14 (3.86-8.75)	0.93 (0.85-1.05)

CCR: Co-contraction ratio.