of Magnetic Resonance Imaging and Electrophysiological Studies in Lumbar Disc Herniation

JOA score

AN value (°)

Spinal stenosis ratio

Width of lateral recess (mm)

Preoperative

Postoperative

Preoperative

Postoperative

Preoperative

Postoperative

Preoperative

Postoperative

L4-5

12.74 ± 3.25

28.85 ± 2.12

5.87 ± 1.38

29.45 ± 4.58

32–59 %

5–7 %

2.92 ± 0.87

5.38 ± 1.69

L5-S1

12.42 ± 3.53

27.13 ± 2.36

5.66 ± 1.27

26.83 ± 3.73

38–64 %

6–8 %

2.74 ± 0.79

5.06 ± 1.43

L4-S1

12.45 ± 3.46

28.53 ± 2.05

5.82 ± 1.29

27.43 ± 3.95

39–57 %

5–8 %

2.84 ± 0.74

5.34 ± 1.65

AN angle between the nerve root canal and disc protrusion, JOA Japanese Orthopedc Association, MRI magnetic resonance imaging

Table 2

Pre- and postoperative electrophysiological studies

	MCV (m/s)		SCV (m/s)		NAP (mV)
L4-5	Preoperative	Postoperative	Preoperative	Postoperative	Preoperative	Postoperative
Tibial nerve	36.5 ± 3.7	57.4 ± 4.8	34.6 ± 3.7	54.1 ± 4.8	4.4 ± 0.9	7.0 ± 1.8
Common peroneal nerve	38.4 ± 4.4	56.7 ± 4.3	36.2 ± 3.4	56.3 ± 4.2	5.2 ± 1.5	6.7 ± 1.3
Superficial peroneal nerve	39.3 ± 3.5	60.3 ± 5.1	34.8 ± 3.6	57.4 ± 4.0	5.5 ± 1.3	8.9 ± 3.1
L5-S1	Preoperative	Postoperative	Preoperative	Postoperative	Preoperative	Postoperative
Tibial nerve	40.1 ± 4.5	63.2 ± 5.8	36.2 ± 4.2	62.7 ± 5.4	5.1 ± 1.3	7.8 ± 2.5
Common peroneal nerve	41.3 ± 4.9	60.4 ± 5.3	38.7 ± 4.4	60.8 ± 5.2	5.9 ± 1.8	7.5 ± 2.2
Superficial peroneal nerve	42.1 ± 4.2	64.3 ± 5.8	38.3 ± 4.1	60.9 ± 4.8	6.1 ± 1.7	9.7 ± 3.5
L4-S1	Preoperative	Postoperative	Preoperative	Postoperative	Preoperative	Postoperative
Tibial nerve	39.3 ± 4.0	62.1 ± 5.2	36.5 ± 3.7	61.2 ± 5.4	4.7 ± 1.2	7.4 ± 2.1
Common peroneal nerve	40.6 ± 4.7	58.3 ± 4.7	37.8 ± 4.0	58.6 ± 4.7	5.5 ± 1.6	7.3 ± 1.9
Superficial peroneal nerve	40.8 ± 3.6	62.6 ± 5.6	37.3 ± 3.6	59.6 ± 4.2	5.6 ± 1.4	9.6 ± 3.2

MCV motor conduction velocity, SCV sensory conduction velocity, NAP nerve action potential

In all the patients, the JOA score, AN value, spinal stenosis ratio in the sagittal plane, and the width of the lateral recess had improved significantly 6 years after discectomy (P < 0.05) (Table 1). The SCV, MCV, and NAP values of the affected legs had increased 6 years after discectomy (P < 0.05) (Table 1). There were no significant differences among L4-5, L5-S1, and L4-S1 patients in either pre- or postoperative JOA scores, AN values, spinal stenosis ratios in the sagittal plane, width of the lateral recess, SCV, MCV, or NAP (P > 0.05).

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