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Table 2 Comparisons of pre- and postoperative radiological and neurological evaluation between the two groups

From: Surgical treatment for basilar invagination with irreducible atlantoaxial dislocation: transoral atlantoaxial reduction plate fixation vs occipitocervical fixation

Items TARP group OF group P
ADI/mm
 Before operation 6.3 ± 2.3 5.7 ± 1.9 .31
 At discharge 1.9 ± 1.1 2.9 ± 1.2 <.01
 3-month follow-up 1.9 ± 1.1 2.9 ± 1.2 <.01
CL/mm
 Before operation 11.1 ± 3.5 10.2 ± 4.8 .43
 At discharge 1.0 ± 1.8 3.0 ± 3.1 < .01
 3-month follow-up 1.0 ± 1.8 3.0 ± 3.1 < .01
CCA/°
 Before operation 122.1 ± 14.7 123.1 ± 18.0 .82
 At discharge 151.5 ± 10.2 139.5 ± 17.2 < .01
 3-month follow-up 151.8 ± 10.1 139.6 ± 17.2 < .01
CMA/°
 Before operation 125.4 ± 10.9 130.1 ± 16.4 .20
 At discharge 156.4 ± 7.1 145.0 ± 14.2 <.01
 3-month follow-up 157.0 ± 6.9 145.3 ± 14.3 <.01
JOA score
 Before operation 10.7 ± 1.5 11.1 ± 1.3 .34
 At discharge 12.6 ± 1.3 12.0 ± 1.0 .06
 3-month follow-up 13.8 ± 1.0 13.0 ± 0.9 <.01
 6-month follow-up 14.3 ± 0.8 13.7 ± 0.6 <.01
 12-month follow-up 15.4 ± 1.00 14.5 ± 0.9 <.01
Bone fusion/n (%)
 3-month follow-up 22 (62.9%) 7 (33.3%) .03
 6-month follow-up 30 (85.7%) 13 (61.9%) .04
 12-month follow-up 35 (100%) 20 (95.2%) .36
 Final follow-up 35 (100%) 21 (100%) NS
  1. ADI Atlantodental interval, CCA Clivus canal angle, CL Distance between the top of the odontoid process and the Chamberlain line, CMA Cervicomedullary angle, JOA Japanese Orthopaedic Association, NS Not significant