Hand Dexterity Impairment in Patients with Cervical Myelopathy: A New Quantitative Assessment Using a Natural Prehension Movement
Table 2
Summarized data from prehension movement analysis and JOA score.
Parameter
Control
Patient
Preop
Postop
Number male/female
30 12/18
23 15/8
15 12/3
Age
63.4 ± 17.2
65.0 ± 14.8
63.9 ± 15.8
Reach-to-grasp movement
Reaction time [RT] (sec)
0.53 ± 0.19
0.50 ± 0.24
0.46 ± 0.22 (0.52 ± 0.25)
Movement time [MT] (sec)
1.01 ± 0.37
1.12 ± 0.43
0.94 ± 0.32 (1.15 ± 0.55)
Maximum grip aperture [MGA] (cm)
9.71 ± 1.35
11.4 ± 2.46
11.7 ± 2.62 (11.5 ± 2.53)
Time of maximum grip aperture [ToMGA] (ms)
0.67 ± 0.28
0.89 ± 0.35
0.78 ± 0.33 (0.91 ± 0.44)
Position of maximum grip aperture [PoMGA] (cm)
4.58 ± 5.09
1.55 ± 0.96
1.27 ± 0.67 (1.43 ± 0.70)
Normalized movement distance [NMD]
1.22 ± 0.18
1.11 ± 0.07
1.08 ± 0.05 (1.10 ± 0.08)
Grip force (N)
Sandpaper
4.18 ± 3.56
3.88 ± 2.08
3.88 ± 2.08
Suede
4.68 ± 3.81
3.86 ± 1.68
3.73 ± 1.84 (4.24 ± 1.82)
Silk
6.39 ± 4.27
4.79 ± 1.94
4.34 ± 2.84 (5.06 ± 2.14)
JOA score
Motor function of fingers
—
1.91 ± 1.12
2.40 ± 1.12 (2.13 ± 1.25)
Sensory function of the upper extremity
—
1.11 ± 0.50
1.37 ± 0.52 (1.10 ± 0.47)
Total (motor + sensory)
—
3.02 ± 1.31
3.77 ± 1.28 (3.23 ± 1.55)
Values are expressed as mean ± SD. JOA test was not performed for normal controls (−). Values in parentheses indicate preoperative values of 15 patients.Statistically significant difference from control (, Welch two sample -test). Statistically significant difference from control (, Welch two sample -test). Statistically significant difference from control (, Wilcoxon rank-sum test). Statistically significant different from preoperation (, paired sample -test).
