Table 2.

Inclusion criteria for various categories included in the study

Category	Inclusion criteria
Transoral and trans-sternal	Case series >10 patients Clinical follow-up available Follow-up time not defined due to limited number of case series
Anterior cervical discectomy and fusion case series	Case series with >100 patients Case series published from January 2005 till January 2020 Clinical follow-up period of minimum 2 years
Case series of anterior cervical Discectomy and fusion versus anterior cervical corpectomy and fusion	Case series >10 patients comparing ACDF versus ACCF Clinical follow-up available Clinical follow-up period of minimum 2 years
Case series of ACDF versus posterior cervical foraminotomy	Case series >10 patients comparing ACDF versus posterior cervical foraminotomy Clinical follow-up available Clinical follow-up period of minimum 2 years
Case series comparing compared ACDF versus cervical arthroplasty	Case series >10 patients comparing ACDF versus arthroplasty Clinical follow-up available Clinical follow-up period of minimum 2 years

ACDF – Anterior cervical discectomy and fusion; ACCF – Anterior cervical corpectomy and fusion