Gait analysis does not correlate with clinical and MR imaging parameters in patients with symptomatic lumbar spinal stenosis

Table 1 Descriptive statistics

Dimension	Coding	Empirical Measurements
		Arithmetic mean ± standard deviation² or frequency of entries
Number of patients		N = 63
Age	Patient Age	68.11 (13.18)
Gender	Male	26
	Female	37
Height	cm	167.92 ± 9.37
Weight	kg	78.49 ± 13.48
Body mass index (BMI)	kg/m²	27.81 ± 4.14
Functional capacity (FFbH-R)	Kohlmann (1996)	43.75 ± 20.41
Depression score (CES-D)	Radloff (1977)	13.63 ± 8.28
Area L1/2	mm²	113,65 ± 30.38
Area L2/3	mm²	93.79 ± 31.47
Area L3/4	mm²	73.00 ± 30.58
Area L4/5	mm²	65.16 ± 31.07
Area L5/S1	mm²	92.79 ± 32.70
Mean canal diameter of the dural sac	mm	87.68 ± 22.38
Number of segments with less than 100 mm²	--	1.84 ± 1.36
Number of segments with less than 70 mm²	--	1.65 ± 1.26
Lowest area of all segments	--	52.65 ± 452.20
Subjective assessment
Location of pain¹	Back pain	48
	Back pain and leg pain	52
Anticipation of leading pain location¹	Mainly back pain	21
	Mainly leg pain	29
	Tiredness in the legs	20
Anticipation of pain quality¹	Pulling pain	38
	Dull pain	12
	Burning pain	17
Behavior subsequent to pain aggravation¹	To stand still	32
	Forward bending	15
	Sitting	28
Subjective estimation of walking distance (by category)	Up to 50 m	9
	< 50–100 m	7
	<100–200 m	13
	<200–500 m	15
	>500 m	19
Gait analysis
Objectively measured walking distance (metric)	m	172.00 (422.00)
Walking time (seconds)	s	352.00 (500.00)
Maximum walking speed	m/s	0.60 ± 0.27
Objectively measured walking distance (by category)	Up to 50 m	9
	< 50–100 m	14
	<100–200 m	14
	<200–500 m	10
	>500 m	16

Due to the small numbers of patients percentages were not calculated.
1) Multiple answering
2) For the variables that are not normally distributed (age, absolute walking distance prior to treatment, seconds walking preoperatively) the median and in parentheses inter-quartile range are presented.

ISSN: 1471-2474