Comparison of Clinical and Radiological Results of Posterolateral Fusion and Posterior Lumbar Interbody Fusion in the Treatment of L4 Degenerative Lumbar Spondylolisthesis oleh Shugo Kuraishi, Jun Takahashi, Keijiro Mukaiyama, Masayuki Shimizu, Shota Ikegami, Toshimasa Futatsugi, Hiroki Hirabayashi, Nobuhide Ogihara, Hiroyuki Hashidate, Yutaka Tateiwa, Hisatoshi Kinoshita, Hiroyuki Kato