Table 1 Data of publication of the management of laminoplasty versus laminectomy for multi-level cervical compressive myelopathy

[6]

Retrospective

1988, Spine

LAMP 15

LAMP 64

Multi-level cervical spondylosis

Open-door LAMP;

>2 years

LAMP: subluxation 8, closing of the open door 2

LAMP: 86% patients were excellent or good

ROM was more limited in LAMP

N/A

N/A

complete LAMT with bilateral partial facetectomy

LAMT 12

LAMT 64.2

LAMT: kyphosis 3, subluxation 9

LAMT: 66% patients were excellent or good, P < 0.05

[7]

Retrospective

1988, Spine

LAMP 75

LAMP 55

Cervical spondylotic myeloradiculopathy, OPLL

Open-door LAMP;

LAMP 10.8 years

N/A

JOA score improvement: LAMP 81.4%

N/A

N/A

N/A

LAMT without damage to the facets

LAMT 14

LAMT 59.2

LAMT 4.6 years

LAMT 81.1%

[8]

Retrospective

1988, J Bone Joint Surg Br

LAMP 18

N/A

N/A

French window LAMP;

>5 years

LAMP: kyphosis 5, instability 5

JOA score:

Limitation of extension was more remarkable after LAMP

N/A

N/A

No significant difference

LAMT 10

LAMT

LAMT: kyphosis 3, instability 3

[9]

Retrospective

2001, Spine

LAMP 13

LAMP 56

Multi-level cervical myelopathy

Open-door/T-saw LAMP;

LAMP 26.2 months (12–46 months)

LAMP 0

Nurick score: a greater percentage of patients in LAMP group reported a subjective improvement

Significantly greater reduction sagittal plane motion in LAMT

LAMT 61.5% (8/13)

LAMT 2

LAMT: myelopathy progression 2, subjacent degeneration 1, infection 1, kyphosis 1, graft site pain 2, revision surgery 1

LAMT 13

LAMT 55

complete LAMT and fusion

LAMT 25.5 months (9–62 months)

P > 0.05

P < 0.01

[10]

Retrospective

2003, Spine

LAMP 51

LAMP 67

Multi-level cervical spondylosis, OPLL, spinal canal stenosis

Open-door LAMP; skip LAMT

LAMP 43 months (24–66 m)

LAMP: C5 paresis 3

Average recovery rates: P > 0.05

Recovery rate of ROM: LAMP 44%, LAMT 98%, P < 0.05

N/A

N/A

Axial symptoms: LAMP 66.7% (34/51), LAMT 2% (1/43), P < 0.05

LAMT 43

LAMT 69

LAMT 30 months (24–41 months)

LAMT: laminar fracture 3, CSF leakage 2

Difficulty in looking around: LAMP 76% (39/51), LAMT 0% (0/43)

[11]

Retrospective

2004, Iowa Orthop J

LAMP 20

LAMP 53.5

Multi-level cervical spondylotic myelopathy or radiculopathy

Open-door LAMP with rib allograft;

LAMP 65.4 months (36–112 months)

LAMP: C5 paresis 2, closure of the open door 1

Modified Nurick scale improvement: LAMP: 43.6%, LAMT 17.8%, P < 0.0001

ROM: LAMP 27° in extension, LAMT 43° in extension, P < 0.001

N/A

N/A

LAMT 22

LAMT 54.3

LAMT

LAMT 64.8 months (53–76 months)

LAMT: wound dehiscence 1, subluxation 2, kyphosis 3

VAS score improvement: LAMP 57%, LAMT 8%, P < 0.01

[12]

Prospective

2007, Spine

LAMP 21

LAMP 62.3

Cervical myelopathy and spinal cord compression

Double-door LAMP;

28.1 months (12–48 months)

No complications in the two groups

Recovery rate of JOA score, P > 0.05

Recovery rate of ROM: LAMP 77.4%, LAMT 88.6%, P > 0.05, C2–C7 lordosis, P > 0.05

N/A

N/A

Skip LAMT

LAMT 20

LAMT 66.1

VAS score: P > 0.05, supplemental analgesic demands: P > 0.05

[13]

Retrospective

2010, Neurol Res

LAMP 72

LAMP 59.7

Cervical spondylotic myelopathy or radiculopathy

LAMP;

4 months

LAMP: infection 1, wound dehiscence1

LAMP had better result in Rankin score, Glasgow outcome score, and Karnofsky score (P < 0.01)

N/A

N/A

N/A

Complete LAMT with preserving the facet joints

LAMT 49

LAMT 57.3

LAMT: infection2, wound dehiscence1

Nurick score: P > 0.05

[14]

Prospective

2010, J Spinal Disord Tech

LAMP 25

LAMP 62.4

Cervical spondylotic myelopathy and spinal cord compression

Double-door LAMP;

>2 years

LAMP: infection 1

SF12 scores for physical and mental health: P > 0.05

Recovery rate of ROM: LAMP 46%, LAMT 84%, P < 0.05

N/A

N/A

Skip LAMT

LAMT 25

LAMT 69.6

LAMT: infection 1

SF12 scores for cervical pain: better for LAMT, P < 0.05

[15]

Retrospective

2011, Clin Orthop Relat Res

LAMP 39

LAMP 60

Multi-level cervical spondylotic myelopathy

LAMP using Mitek suture anchor fixation;

Average of 24 months

LAMP: chronic pain 2, recurrent stenosis 1, persistent radiculopathy 1, revision surgery 2

Gait or pain postoperatively: P > 0.05

Sagittal alignment postoperatively: better in LAMP, P < 0.05

LAMT: 98.8% (81/82)

LAMT 1

LAMT 82

LAMT 64

Neck pain:

LAMT and fusion

P > 0.05

LAMT: chronic pain 2, dysphagia 1, infection 1, junctional stenosis 1, kyphosis 1, revision surgery 2

Junctional kyphosis: P > 0.05

[16]

Retrospective

2011, J Neurosurg Spine

LAMP 30

LAMP 61

Cervical stenotic myelopathy

Instrumented, open-door LAMP; LAMT and fusion

LAMP 42.3 months (13–69 months)

LAMP: infection 2, sterile seromas 2, C5 paresis 1, urinary retention 1, revision surgery 4

Nurick score or JOA score: P > 0.05

Radiographic outcomes were similar between the groups

LAMT 92% (24/26)

LAMP 2

LAMT 2

LAMT: 26

LAMT: 58

VAS score improvement: LAMP -0.2 (pain scores increased slightly postoperatively)

LAMT: 41.3 m (12-85m)

LAMT: infection 4, sterile seromas 2, C5 paresis 1, revision surgery 7

LAMT 2.8, P < 0.05

[17]

Prospective

2012, Neurosurgery

LAMP 9

LAMP 61

Multi-level cervical spondylotic myelopathy with or without radiculopathy

Open-door expansile LAMP;

>12 months

No complications in the two groups

Nurick grade, SF-36 score, Neck disability index, self-reported outcome measures were improved only in LAMP, P < 0.05

ROM was decreased only in LAMT, P < 0.05

N/A

N/A

LAMT 7

LAMT 55

LAMT and fusion

Percent of change in area of spinal canal: LAMP 34%, LAMT 76%, P < 0.01

[18]

Retrospective

2012, Neurosurgery

LAMP 154

LAMP 67

Cervical radiculopathy or myelopathy

Standard LAMP; LAMT

LAMP 96 months

N/A

LAMP was associated with more neck pain and worse quality of life (4 or more levels involved); there was no difference (3 or fewer levels)

A greater extent of decompression in LAMP, P < 0.05

N/A

N/A

LAMT 114

LAMT 73

LAMT 58 months

Sagittal alignment: P > 0.05

VAS score: P > 0.05

EQ-5D questionnaire: improve significantly in LAMT

[19]

Retrospective

2013, Eur Spine J

LAMP 36

LAMP 57.1

Multi-level cervical degenerative myelopathy

Open-door LAMP; LAMT and fusion

LAMP 9.2 months (7–11 months)

N/A

Final follow-up JOA score and neurological recovery rate: P > 0.05

Loss of curvature index: LAMP 2.60 ± 1.01, LAMT 1.22 ± 0.72, P < 0.05

N/A

N/A

LAMT 32

LAMT 55.9

Axial symptom incidence: LAMP 66.7 % (24/36), LAMT 37.5 % (12/32), P < 0.05

LAMT 8.9 months (7–12 months)

[20]

Retrospective

2013, Orthopedics

LAMP 75

LAMP 57.2

Multi-level cervical stenotic myelopathy

Plate-only open-door LAMP;

>24 months

LAMP: C5 paresis 3, CSF leakage 1, kyphosis 3, restenosis 1, axial pain 9

JOA score and Nurick score: P > 0.05

Increase of dural sac area: LAMP 31.9%, LAMT 52.7%, P < 0.001

LAMP 98.67% (74/75)

N/A

LAMT 66

LAMT 57

LAMT and fusion

NDI scores and VAS scores: better improvement in LAMP, P < 0.05

Spinal cord shift: LAMP 1.2 mm, LAMT 2.4 mm, P < 0.001

LAMT 96.97% (64/66)

LAMT: C5 paresis 11, CSF leakage 3, kyphosis 2, infection 1, axial pain 23

Better neck function recovery in LAMP

Curvature index: P > 0.05

P > 0.05

Greater loss of ROM in LAMT