Motion-preserving treatment of unstable atlas fracture: transoral anterior C1-ring osteosynthesis using a laminoplasty plate

Table 1 Clinical data of 13 patients

Case	Injury cause	Fracture characteristics	LMD (pre)	LMD (post)	VAS (pre)	VAS (post)	Axial ROM after surgery (°)	Bone union confirmed (month)	Follow-up (month)	Complication
1	MVA	Single AAF and single PAF	7.0	1.6	8	0	29.9	6	15	No
2	Falling	Single AAF and single PAF	4.7	0.0	7	0	43.2	6	12	No
3	MVA	Single AAF and single PAF	5.5	0.8	6	0	35.7	3	12	No
4	MVA	Double AAFs and single PAF	9.3	2.1	8	1	55.9	3	18	No
5	Falling	Single AAF and single PAF	7.2	1.4	7	2	60.3	9	20	No
6	Falling	Double AAFs and double PAFs	6.1	1.0	7	0	52.9	3	15	No
7	MVA	Single AAF and single PAF	3.5	0.0	6	0	39.4	6	24	No
8	MVA	Single AAF and single PAF	6.9	0.5	6	0	64.2	6	24	No
9	MVA	Double AAFs and single PAF	8.3	1.8	7	1	44.8	3	22	No
10	Falling	Single AAF and double PAFs	7.5	1.0	7	0	50.2	9	15	No
11	MVA	Single AAF and double PAFs	5.9	0.6	5	0	43.8	3	21	No
12	Falling	Single AAF and single PAF	5.5	1.2	6	0	62.3	6	16	No
13	MVA	Single AAF and single PAF	6.7	0.8	6	1	58.7	3	12	No
M ± SD			6.5 ± 1.5	1.0 ± 0.6	6.6 ± 0.9	0.4 ± 0.7	49.3 ± 10.8	5.1 ± 2.3	17.4 ± 4.4
t			19.090		24.239
P			0.000^a		0.000^a

M Male, F Female, MVA Motor verhicle accident, AAF Anterior arch fracture, PAF Posterior arch fracture, LMD Lateral mass displacement, VAS Visual analog scale, ROM Range of motion
^a Paired-sample t-test

ISSN: 1471-2474