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A modified method for recording lateral femoral cutaneous nerve sensory volley in patients with meralgia paraesthetica
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F166 THE SIZE VERSUS LOCALISATION OF LOWERLUMBAR DISC HERNIATION IN EMG DIAGNOSTICS KINALSKI R, Department of Medical R e h a b i l i t a t i o n , Province Hospital, Bialystok, Poland The findings of EMG, neurological and radiculographic examinations of 100 patients operated on for low back pain and s c i a t i c a were analyzed. The percentages of correct diagnosis of nerve root compressed and the level of hern i a t i o n were compared. The number of p a r t i a l l y denervated muscles was determined for each of the patients. The test of median was used f o r comparison of mean values of the number of p a r t i a l l y denervated muscles calculated f o r the groups of patients with complete and incomplete disc h e r n ia t io n , other p e r i r a d i c u l a r changes or negative surgical f indings . In EMG as well as in neurological examinations the exact level of disc herniation was less frequently diagnosed than the proper nerve root compressed. The greater number of p a r t i a l l y denervated muscles was s i g n i f i c a n t l y more often stated in groups of patients with complete disc herniation in comparison with the other groups of patients.
F167 A MODIFIED METHODFOR RECORDING LATERAL FEMORALCUTANEOUSNERVE SENSORY VOLLEY IN PATIENTS WITH MERALGIA PARAESTHETICA v
KLOPCIC-SPEVAK M, PREVEC TS, I n s t i t u t e f o r Medical R e h a b i l i t a t i o n , 21 000 Novi Sad and University I n s t i t u t e f o r C l i n i c a l Neurophysiology, 61 105 Ljubljana, Yugoslavia A c t i v i t y of the l a t e r a l femoral cutaneous nerve (SNAP) was recorded with a mod i f i e d antidromic method in 29 healthy volunteers aged 18-58 years (58 nerves). The nerve was stimulated with s u p e r f i c i a l b i p o l a r electrodes about 5 cm below the superior i l i a c spine. SNAP was recorded from two s t r i p e s o f DISA 13L69 electrodes (distance 2.5 cm), fastened over the a n t e r o l a t e r a l aspect of the d i s t a l t h i r d of t h i g h . 8-32 responses were averaged. The peak to peak amplitude of SNAP was 2.9 + 0.05 ~V. CV of the fastest fibres was 62.3 + 5.51 m/s when determined from-the onset of the negative wave and 55.3 + 4.TO m/s when determined from the peak. The duration of SNAP was 1.9 + 0.5 mTs. S i m i l a r l y as the l a tency, the duration was correlated (P<0.5%) with the distance between the stimu l a t i n g and recording electrodes (25.3+3.5 cm). I t was possible to record SNAP also in obese persons. In patients wit~-meralgia paraesthetica, CV of the symptomatic nerve was slow in comparison with the asymptomatic side and with the values recorded in controls. Quite often the amplitude of SNAP was so low that i t was not possible to extract i t from the noise with 64 summations. Our results show that this noninvasive and simple method can provide r e l i a b l e and objective signs of l a t e r a l femoral cutaneous nerve dysfunction.
F168 RELATIONSHIPBETWEEN SENSORY NERVE CONDUCTIONAND TEMPERATUREOF THE HAND
KOCZOCIK-PRZEDPELSF~AJ, GORSKI S, POWIERZA E, Department of Pathophysiology of Locomotor Organs, I n s t i t u t e of Orthopedic Surgery and R e h a b i l i t a t i o n , Pozna#, Poland Electroneurographic and thermographic investigations were carried out in 32 persons. Sensory nerve conduction v e l o c i t y , the amplitude of sensory nerve
F166 THE SIZE VERSUS LOCALISATION OF LOWERLUMBAR DISC HERNIATION IN EMG DIAGNOSTICS KINALSKI R, Department of Medical R e h a b i l i t a t i o n , Province Hospital, Bialystok, Poland The findings of EMG, neurological and radiculographic examinations of 100 patients operated on for low back pain and s c i a t i c a were analyzed. The percentages of correct diagnosis of nerve root compressed and the level of hern i a t i o n were compared. The number of p a r t i a l l y denervated muscles was determined for each of the patients. The test of median was used f o r comparison of mean values of the number of p a r t i a l l y denervated muscles calculated f o r the groups of patients with complete and incomplete disc h e r n ia t io n , other p e r i r a d i c u l a r changes or negative surgical f indings . In EMG as well as in neurological examinations the exact level of disc herniation was less frequently diagnosed than the proper nerve root compressed. The greater number of p a r t i a l l y denervated muscles was s i g n i f i c a n t l y more often stated in groups of patients with complete disc herniation in comparison with the other groups of patients.
F167 A MODIFIED METHODFOR RECORDING LATERAL FEMORALCUTANEOUSNERVE SENSORY VOLLEY IN PATIENTS WITH MERALGIA PARAESTHETICA v
KLOPCIC-SPEVAK M, PREVEC TS, I n s t i t u t e f o r Medical R e h a b i l i t a t i o n , 21 000 Novi Sad and University I n s t i t u t e f o r C l i n i c a l Neurophysiology, 61 105 Ljubljana, Yugoslavia A c t i v i t y of the l a t e r a l femoral cutaneous nerve (SNAP) was recorded with a mod i f i e d antidromic method in 29 healthy volunteers aged 18-58 years (58 nerves). The nerve was stimulated with s u p e r f i c i a l b i p o l a r electrodes about 5 cm below the superior i l i a c spine. SNAP was recorded from two s t r i p e s o f DISA 13L69 electrodes (distance 2.5 cm), fastened over the a n t e r o l a t e r a l aspect of the d i s t a l t h i r d of t h i g h . 8-32 responses were averaged. The peak to peak amplitude of SNAP was 2.9 + 0.05 ~V. CV of the fastest fibres was 62.3 + 5.51 m/s when determined from-the onset of the negative wave and 55.3 + 4.TO m/s when determined from the peak. The duration of SNAP was 1.9 + 0.5 mTs. S i m i l a r l y as the l a tency, the duration was correlated (P<0.5%) with the distance between the stimu l a t i n g and recording electrodes (25.3+3.5 cm). I t was possible to record SNAP also in obese persons. In patients wit~-meralgia paraesthetica, CV of the symptomatic nerve was slow in comparison with the asymptomatic side and with the values recorded in controls. Quite often the amplitude of SNAP was so low that i t was not possible to extract i t from the noise with 64 summations. Our results show that this noninvasive and simple method can provide r e l i a b l e and objective signs of l a t e r a l femoral cutaneous nerve dysfunction.
F168 RELATIONSHIPBETWEEN SENSORY NERVE CONDUCTIONAND TEMPERATUREOF THE HAND
KOCZOCIK-PRZEDPELSF~AJ, GORSKI S, POWIERZA E, Department of Pathophysiology of Locomotor Organs, I n s t i t u t e of Orthopedic Surgery and R e h a b i l i t a t i o n , Pozna#, Poland Electroneurographic and thermographic investigations were carried out in 32 persons. Sensory nerve conduction v e l o c i t y , the amplitude of sensory nerve