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Table 1 Characteristics of included studies

From: Association between sagittal balance and adjacent segment degeneration in anterior cervical surgery: a systematic review and meta-analysis

Authors Year Study type Age (years) Male Surgical procedure Follow-up N (ASD) N (Controls)
Katsuura et al. [16] 2001 Retrospective study 48.1 for ASD and 52.7 for Control 19/21 for ASD and 15/21 for Control ACDF 122.4 months for ASD and 112.7 months for Control 21 21
Kim et al. [17] 2015 Prospective study 43.52 117/180 TDR Mean 48.6 months 73 107
Lee et al. [18] 2015 Retrospective study 47.1 12/14 CDA Mean 43.4 months 5 9
Retrospective study 53.6 24/28 ACDF Mean 44.6 months 16 12
Li et al. [19] 2015 Retrospective study 50.2 61/106 ACDF 30.6 months for ASD and 31.2 months for non-ASD 28 88
Song et al. [20] 2018 Retrospective study 51.8 for ASD and 48.5 for N-ASD 11/25 for ASD and 85/175 for N-ASD ACCF and ACDF 34.2 months for ASD and 34.8 months for N-ASD 25 175
Song et al. [21] 2014 Retrospective study 57.73 for ASD and 54.09 for Control 12/15 for ASD and 125/216 for Control ACDF Mean 63.85 months 15 216
Yang et al. [22] 2017 Retrospective study 43.3 for ASD and 42.6 for N-ASD 17/21 for ASD and 25/27 for N-ASD CDA Mean 79.3 months for SASD and 78.6 months Non-SASD 38 52
  1. Abbreviation: ASD adjacent segment disease, ACDF anterior cervical discectomy and fusion, CDA cervical disc arthroplasty