Using Piezosurgery in Anterior Cervical Discectomy and Fusion to Treat Complex Cervical Spondylotic Myelopathy Is Safe and Effective

Table 2

Comparison of two groups’ operation times, intraoperative blood loss, neurological functions, and complications ().

	Number	Surgical time (min)	Intraoperative blood loss (ml)	Complications	JOA scores				JOA improvement rate
					Preoperative	Postoperative	Last follow-up	F and values	Postoperative	Last follow-up
Group A	26	45.70 ± 3.93	48.85 ± 4.38	1	7.20 ± 0.91	11.31 ± 1.20	14.61 ± 1.80	F = 195.549	39.0%	71.6%
Group B	21	52.74 ± 6.71	117.86 ± 16.32	5	7.38 ± 1.00	11.55 ± 1.08	14.57 ± 1.89	F = 143.315	38.7%	69.4%
Statistics value		t = 4.254	t = 18.835	= 4.157	t = 0.611	t = 0.703	t = 0.061		= 0.686	= 1.231
value		<0.001	<0.001	0.041	0.544	0.485	0.951		0.496	0.225

JOA, Japanese Orthopaedic Association.