 Facet joint steroid injections and radiofrequency denervations of the facet joint are the most commonly performed minimally invasive pain procedures for lumbar facet joint pain. Radiofrequency denervation is carried out by thermal lesioning of the medial branches that supply the facet joints. Conventionally two medial branches have been shown to innervate one facet joint and based on this, the norm is to lesion two nerves to denervate one facet joint. However, there is some variation in the nerve supply which may account for failure or false negative results of the diagnostic blocks. 