Laminoplasty instead of laminectomy as a decompression method in posterior instrumented fusion for degenerative cervical kyphosis with stenosis

Table 3 Comparison of blood loss and operation time between studies

Items	Mean age	Diagnosis	ACF	PIF + PD	One stage of ACF and PIF + PD
Present study	67.6 y/o	Degenerative cervical kyphosis with stenosis	ABL: 135.2 ± 85.2 ml	ABL: 307.7 ± 92.3 ml	ABL: 442.9 ± 236.0 ml
Present study	67.6 y/o	Degenerative cervical kyphosis with stenosis	MST: 136.8 ± 52.3 min	MST: 139.3 ± 50.4 min	MST: 314.5 ± 51.2 min
Du et al. [2]	59.6 y/o	CSM/OPLL/cervical stenosis	None	ABL: 650 mL MST: 150 min	None
Epstein et al. [20]	54.0 y/o	OPLL	None	None	ABL: 500 ml
Epstein et al. [20]	54.0 y/o	OPLL	None	None	MST: 522 min

CSM cervical spondylotic myelopathy, OPLL ossification of the posterior longitudinal ligament, ABL average blood loss, MST mean surgical time, ACF anterior cervical fusion, PIF + PD posterior instrumented fusion with decompression

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