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Table 1 Characteristics of the studies included in this meta-analysis

From: Zero-profile implant versus conventional cage-plate implant in anterior cervical discectomy and fusion for the treatment of degenerative cervical spondylosis: a meta-analysis

Study

Design

Sample size (male/female)

Surgical level

Mean age (years)

Outcome

Follow-up time (m)

Zero-profile implant

Zero-p

CCP

Zero-p

CCP

Zero-p

CCP

 

Wang ZW et al. (2015) [11]

Retrospective cohort

30 (18/12)

33 (14/19)

1 to 2

56.8

54

Operation time, blood loss, NDI and JOA scores, Cobb angles, fusion rate, postoperative dysphagia, adjacent disc degeneration and instability, cervical lordosis

Mean 24.1, minimum 12

Mean 23.8, minimum 12

ROI-C, LDR, Troyes, France

Son DK et al. (2014) [13]

Retrospective

21

27

1

55.4

50.2

Operation time, blood loss, mJOA and achieved mJOA scores, mJOA recovery rate, prevertebral soft tissue thickness, postoperative dysphagia, adjacent disc degeneration

6

6

Zero-p; Synthes GmbH, Oberdorf, Switzerland

Wang ZD et al. (2014) [16]

Retrospective

22 (11/11)

25 (10/15)

1

50.9

53.7

Operation time, blood loss, JOA scores, JOA recovery rate, postoperative dysphagia, adjacent segment degeneration

Mean 33.6

Mean 33.2

Zero-p; Synthes GmbH, Oberdorf, Switzerland

Li YB et al. (2013) [12]

Prospective, RCT

23 (9/14)

23 (13/10)

1

49.3

50.1

Operation time, blood loss, exposure time to X-rays, JOA and VAS scores, postoperative dysphagia, fusion time, adjacent disc degeneration

24

24

Zero-p; Synthes GmbH, Oberdorf, Switzerland

Qi M et al. (2013) [14]

Retrospective cohort

83 (47/36)

107 (58/49)

1 to 3

43.6

44.9

Operation time, blood loss, NDI and VAS scores, fusion rate, graft migration or nonunion, Cobb angles, modified Swallowing Quality of Life scores

Mean 18.6

Mean 19.3

Zero-p; Synthes GmbH, Oberdorf, Switzerland

Vanek P et al. (2013) [15]

Prospective

44 (26/18)

33 (19/14)

1 to 2

50.2

51.8

NDI scores, Cobb C and Cobb S angles, 2-year radiological stability, dysphagia

Minimum 24

Minimum 24

Zero-p; Synthes GmbH, Oberdorf, Switzerland

Miao JH et al. (2013) [17]

Prospective

39 (23/16)

50 (29/21)

1 to 3

50.3

52.6

JOA and VAS scores, postoperative dysphagia, Cobb angles, 1-year operation effect, implant displacement, and vertebral instability

Mean 16.9

Zero-p; Synthes GmbH, Oberdorf, Switzerland

  1. NDI neck disability index, JOA Japanese Orthopaedic Association, VAS visual analog scale