RADIOLOGICAL LUMBAR "INSTABILITY": PASSIVE LUMBAR EXTENSION TEST This test is a new promising test to evaluate patients with lumbar instability. It has been found to have a sensitivity of 84,2% and a specificity of 90,4% when radiological examination was used as the gold standard for instability in a group according to Kasai et al. (2006). However, like in many other conditions, radiographic findings are not always consistent with clinical symptoms. (Maigne et al. 2003.) Kasai et al. (2006): htt