Prevalence of neuropathic pain among Black African patients suffering from common low back pain.

To study the prevalence and semiotic characteristics of neuropathic pain in the common low back pain to the Black African subject. This was a prospective cross-sectional survey carried on from April 1 2009 to August 31 2009 in consultations of rheumatology, neurology, and neurosurgery at the University Hospital Yalgado Ouédraogo in Ouagadougou (Burkina Faso). All patients with a low back pain or a common lomboradiculalgie were included. DN4 questionnaire was used for the diagnosis of neuropathic pain. One hundred and seven patients have been recruited during the study period; Sixty-four (59.80%) were female (sex ratio M/F: 0.67). The average age was 34.11 ± 13.46 years of age with extremes of 20 and 79. The average duration of disease was 48.53 months with extremes of 10 days and 50 years. Eighty-seven patients (81.31%) had a disease duration, which was 3 months longer. Sixty-six patients (61.70%) had a predominant lomboradiculalgie; among the remaining 41, low back pain predominated. Average intensity of pain was 62.81 ± 22.43 (on a scale of 100). A sign of Lasèque was present in the 41 (38.30%) patients. Fifty-three (49.5%) patients had a neuropathic pain. The prevalence of neuropathy signs according to the DN4 questionnaire was as follows: burning (n = 37; 34.58%), painful cold (n = 13; 12.15%), electric shocks (n = 31; 38.97%), pins and needles (n = 34; 31.77%), tingling (n = 35; 32.71%), numbness (n = 45; 42.05%), itching (n = 18; 16.82%), touch hypoesthesia (n = 35; 32.71%), pinprick (n = 33; 30.84%), and tactile allodynia (n = 21; 19.62%). Among the studied variables, the presence of a radiculalgy was statistically associated with neuropathic pain. The lomboradiculalgie of the Black African subject associates neuropathic pain observed in half of patients. Treatment must therefore always take account of this association. However, further studies are needed before any definitive conclusion.