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Table 1 the classification of three-level HS

From: Classification of three-level hybrid surgery for the treatment of cervical degenerative disc disease: a retrospective study of 108 patients

Classification Description
Type I One-level CDA and two-level ACDF
 Type Ia Contiguous three-level HS. CDA was performed at the superior lesion segment, and ACDF was performed at the intermediate and inferior lesion segments
 Type Ib Contiguous three-level HS. CDA was performed at the intermediate lesion segment, and ACDF was performed at the superior and inferior lesion segments
 Type Ic Contiguous three-level HS. CDA was performed at the inferior lesion segment, and ACDF was performed at the superior and intermediate lesion segments
 Type Id Noncontiguous three-level HS
Type II Two-level CDA and one-level ACDF
 Type IIa Contiguous three-level HS. CDA was performed at the superior and intermediate lesion segments, and ACDF was performed at the inferior lesion segment
 Type IIb Contiguous three-level HS. CDA was performed at the superior and inferior lesion segments, and ACDF was performed at the intermediate lesion segment
 Type IIc Contiguous three-level HS. CDA was performed at the intermediate and inferior lesion segments, and ACDF was performed at the superior lesion segment
 Type IId Noncontiguous three-level HS
  1. HS hybrid surgery, CDA cervical disc arthroplasty, ACDF anterior cervical discectomy and fusion