What is the impact of scoliotic correction on postoperative shoulder imbalance in severe and rigid scoliosis

Table 5 Changes of Shoulder Balance after Surgery and at Follow-up

	N-N	N-B	N-P	B-N	B-B	B-P	P-N	P-B	P-P
Changes after Surgery
Number of patients	12	10	8	2	4	7	1	0	4
Correction rate of proximal thoracic curve (%)	30.79	34.95	15.18	42.19	41.69	46.26	44.10	–	40.62
Correction rate of main thoracic curve (%)	40.53	56.55	63.99	54.01	60.27	66.01	64.00	–	51.67
Correction rate of lumbar curve (%)	55.16	70.76	66.96	88.39	69.37	68.70	0	–	48.86
Correction rate ratio	1.08	0.96	0.67	1.26	0.94	0.89	0.34	–	0.83
Changes between after surgery and at Follow-up
Number of patients	12	3	0	0	8	6	0	6	13
Correction rate of proximal thoracic curve (%)	28.45	37.33	–	–	42.76	48.15	–	32.10	44.95
Correction rate of main thoracic curve (%)	39.36	57.45	–	–	57.58	61.55	–	61.73	60.67
Correction rate of lumbar curve (%)	46.19	21.09	–	–	66.64	63.35	–	72.36	58.27
Correction rate ratio	0.96	0.51	–	–	0.97	0.90	–	0.87	0.84

N indicates negative imbalanced shoulder; B, balanced shoulder; P, positive imbalanced shoulder
N-B represents that the negative imbalanced shoulder preoperatively to balanced shoulder postoperatively or that the negative imbalanced shoulder postoperatively to balanced shoulder at follow-up
Correction rate ratio = (Correction rate of proximal thoracic curve + Correction rate of lumbar curve) / (Correction rate of main thoracic curve * 2)

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