BMC Musculoskeletal Disorders

Table 2 Patients’ radiographic outcomes (mean ± SD)

From: Predictive ability of pharyngeal inlet angle for the occurrence of postoperative dysphagia after occipitocervical fusion

	Dysphagia (26 patients)	Without Dysphagia (72 patients)	P value
Pre ADI	0.60 ± 0.26 cm	0.59 ± 0.35 cm	0.554
Pre O-C2a	9.58 ± 10.21	4.04 ± 16.01	0.191
Pre O-EAa	104.32 ± 7.44	101.33 ± 7.94	0.169
Pre C2Ta	94.73 ± 13.52	97.42 ± 17.72	0.504
Pre C2-7a	20.48 ± 14.06	25.67 ± 18.50	0.211
Pre PIA	96.80 ± 8.00	90.06 ± 11.42	0.005*
Pre nPAS	1.25 ±0.45cm	1.34±0.48cm	0.316
Post ADI	0.33±0.14cm ^#	0.33±0.12cm^#	0.971
Post O-C2a	0.07±9.12^#	7.86±13.96^#	0.005*
Post O-EAa	94.21±7.87^#	101.42±6.44	0.000*
Post C2Ta	94.13±12.31	93.56±14.34^#	0.863
Post C2-7a	24.60±13.27	18.00±15.58^#	0.038*
Post PIA	81.85±5.51^#	91.28±10.50	0.000*
Post nPAS	0.69±0.31cm^#	1.43±0.50cm	0.000*
dADI	-0.27±0.22cm	-0.26±0.28cm	0.621
dO-C2a	-9.51±5.18	3.82±11.71	0.000*
dO-EAa	-10.11±5.12	0.10±7.15	0.000*
dC2Ta	-0.61±5.88	-3.86±11.37	0.159
dC2-7a	4.11±13.93	-7.66±13.57	0.001*
dPIA	-13.95±6.87	1.22±11.12	0.000*
dnPAS%	-43.84±16.33%	16.90±59.10%	0.000*

SD Standard deviation, Pre Preoperative, ADI Atlas-dens interval, O-C2a O-C2 angle, O-EAa Occipital and external acoustic meatus to axis angle, C2Ta C2 tilting angle, PIA Pharyngeal inlet angle, nPAS The narrowest oropharyngeal airway space, Post Postoperative, d The difference between pre- and postoperative values, dnPAS% (postoperative nPAS- preoperative nPAS)/preoperative nPAS*p<0.05 between groups; ^#p<0.05 comparing with preoperative data

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