“…This narrative review included all published materials illustrating technical aspects of lumbar USTFI. Lumbar selective nerve block (SNRB), performed as a diagnostic procedure for nerve root pain with similar technical procedure as that of TFIs, was also included [19][20][21][22][23]. PubMed, Embase, and EBSCO were searched for relevant literature using combinations of keywords, such as US, USguided, sonography, lumbar, TFI, periradicular injection, pararadicular injection, and selective nerve root block.…”