TABLE 1.

Demographics of Patients in the C5 Palsy and Control Groups

	n (%)
Characteristic	Nonpalsy (N=875)	Palsy (N=26)	P
Age [median (range)]	55 (49–62)	60 (53–66)	0.043
Sex
Male	630	21
Female	245	5	0.325
Duration [median (range)]	6 (3–24)	13 (11–15)	0.082
Previous cervical disease	36 (4.11)	0	0.6199
Previous lumbar disease	49 (5.6)	1 (3.85)	1
Posterior neck pain	469 (53.91)	14 (53.85)	0.995
Right arm pain	453 (52.07)	13 (50)	0.8352
Left arm pain	465 (53.51)	14 (53.85)	0.973
Tingling sensation	618 (71.12)	20 (76.92)	0.519
Numbness	447 (51.5)	11 (42.31)	0.3556
Weakness	473 (54.43)	17 (65.38)	0.2688
Myelopathy	581 (67.09)	20 (76.92)	0.292
Preoperative JOA score [median (range)]
Total	12 (11–15)	13 (11–15)	0.680
I	2 (2–4)	2 (2–4)	0.320
II	3 (2–4)	3 (3–4)	0.686
III_A	1 (1–2)	2 (1–2)	0.185
III_B	1 (1–2)	2 (1–2)	0.185
III_C	2 (1–2)	2 (1–2)	0.226
IV	3 (2–3)	3 (2–3)	0.605
No. involved level	4 (3–5)	4 (3–5)	0.183
OPLL type
Continuous	75 (8.68)	1 (3.85)	0.4852
Segmental	374 (43.39)	9 (34.62)
Mixed	268 (31.02)	9 (34.62)
Circumscribed	147 (17.01)	7 (26.92)
OPLL involvement at C1, C2, C3	457 (52.23)	19 (73.08)	0.0359
OPLL involvement at C4, C5	848 (96.91)	25 (96.15)	0.5651
OPLL involvement at C6, C7	754 (86.17)	21 (80.77)	0.3937
Operation method			0.0112
Laminoplasty—right open door	75 (8.57)	4 (15.38)
Laminoplasty—left open door	82 (9.37)	4 (15.38))
Laminoplasty—French door	15 (1.71)	1 (3.85)
LMSF	36 (4.11)	2 (7.69)
ACDF or ACCF	478 (54.63)	15 (57.69)
Anterior and posterior combined	189 (21.6)	0 (0.00)
Postoperative shoulder pain	163 (18.63)	14 (53.85)	<0.0001

Significant P <0.05 values are in bold.

ACCF indicates anterior cervical corpectomy and fusion; ACDF, anterior cervical discectomy and fusion; JOA, Japanese Orthopedic Association; LMSF, lateral mass screw fixation and fusion; OPLL, ossification of the posterior longitudinal ligament.