Three-dimensional reduction method with a modified C2 isthmus screw in irreducible atlantoaxial dislocation: a technical note

Table 2 Radiographic measurement before and after surgery

Case	Age	Sex	Diagnosis	OC2A		CCA		CMA
Case	Age	Sex	Diagnosis	Pre-op, degree*	Post-op, degree*	Pre-op, degree^#	Post-op, degree^#	Pre-op, degree^&	Post-op, degree^&
1	65	M	Fracture nonunion	15.9	8.5	123.5	145.4	147.9	158.9
2	66	F	Rheumatoid arthritis	21.3	22.6	146.6	150	147	152
3	24	M	Os odontoideum	− 11.3	24.8	111.6	145.5	120.9	156.5
4	29	M	Os odontoideum	− 10.2	4.8	109.5	119.5	124.4	139.5
5	63	F	Fracture nonunion	− 4.6	11.1	143.3	158.2	146.1	153.1
6	32	F	Os odontoideum	− 3.8	16.6	126.5	136.5	143.9	154.2
7	60	F	Rheumatoid arthritis	17.3	20	152.3	156.2	147.4	150.2
8	61	M	Rheumatoid arthritis	28.4	26.9	155.9	171.3	152.3	166.7
9	43	M	Fracture malunion	1.8	14.6	145.9	150.4	144.8	163.3
10	52	M	Os odontoideum	10	18.3	151.3	158.5	143.6	150.2
11	13	F	Developmental malformation	9.9	16.9	144	151.2	129	164.7
12	17	F	Os odontoideum	24	31.5	146.5	142.1	156.8	152.6
Mean degree				8.2 ± 13.7	18.1 ± 7.7	138.1 ± 16	148.7 ± 12.9	142 ± 11.2	155.2 ± 7.5

ISSN: 1471-2482