Introduction Lumbosacral radicular pain (LRP) is an important health care burden with a prevalence ranging from 1.2 to 43%. Neurodynamic tests are frequently used for the physical examination of nerve related pain. Baselgia and al. reported that negative neurodynamic tests are correlated with pronounced small nerve fiber sensory deficit in patients suffering from median nerve compression . Nonetheless, such a correlation has never been studied yet regarding LRP. Purpose/aim This study aims to evaluate if negative neurodynamic tests are associated with more pronounced small nerve fibers sensory deficit in patients suffering from LRP. Material and methods The study consisted of a single assessment session. In order to be included patients had to suffer from LRP associated with a positive slump test or a nerve dysfunction pointed out by means of muscle manual testing, tendon reflex examination and/or clinical sensory testing (CST). Five clinical test developed to test small nerve fiber function were included in the CST2. Results Among the 8 patients recruited, 6 had a positive slump test and 7 presented at least one positive sensory test for the small nerve fibers (figure 1). Patients presenting with a negative slump test did not have a greater small nerve fibers dysfunction than patients with a positive neurodynamic test. Conclusions/Implication In this pilot study with patients suffering from LRP, negative neurodynamic tests did not appear to be associated with more small nerve fiber dysfunctions. However, considering the small sample size, these results need to be confirmed in further studies