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Table 1 Demographic and clinical data of the 9 patients

From: Transoral intraarticular cage distraction and C-JAWS fixation for revision of basilar invagination with irreducible atlantoaxial dislocation

Case Age (year)/Sex Anomalies in radiology Previous surgery Duration between the previous urgery and the revision (month) Revision cause Revision surgery
1 59/F BI, IAAD, AA OCF (C0–1) 120 IAAD with VSCC PRI and TARF
2 41/M BI, IAAD, AA, KFS, Chiari OCF (C0–2) 36 IAAD with VSCC PRI, PFD and TARF
3 57/M BI, IAAD, AA OCF (C0–3) 180 IAAD with VSCC PRI and TARF
4 35/F BI,IAAD, AA, KFS OCF (C0–2) 65 IAAD with VSCC PRI and TARF
5 67/F BI, IAAD, AA, Chiari OCF (C0–4) 47 IAAD with VSCC PRI, PFD and TARF
6 27/M BI, IAAD, AA, KFS, Chiari OCF (C0–2) 132 IAAD with VSCC PRI, PFD and TARF
7 36/F BI, IAAD, AA OCF (C0–2) 18 IAAD with VSCC PRI and TARF
8 45/F BI, IAAD OCF (C0–3) 144 IAAD with VSCC PRI and TARF
9 18/M BI, IAAD, AA, KFS, Chiari OCF (C0–1) 20 IAAD with VSCC PRI and TARF
  1. BI basilar invagination; IAAD irreducible atlantoaxial dislocation; AA atlas assimilation; KFS Klippel-Feil syndrome; Chiari Chiari malformation; OCF occipitocervical fusion; PRI posterior removal of instrument; PFD posterior fossa decompression; VSCC ventral spinal cord compression; TARF transoral atlantoaxial reduction and fixation