IL17A and intervertebral disk degenerative disorder: Recently, high levels of IL-17A were associated with IVD degeneration (IDD) and IVD herniation (LDH) and IL-17A is considered as the crucial factor in IVD pathology (Shamji et al., 2010; Gabr et al., 2011; Cheng et al., 2013; Suyama et al., 2018).