P68. Mid-Term Clinical Outcome of Posterior Decompression Without Fusion for Degenerative Lumbar Spondylolisthesis

P68. Mid-Term Clinical Outcome of Posterior Decompression Without Fusion for Degenerative Lumbar Spondylolisthesis Keigo Yasui, Manabu Ito, MD, PhD, Kuniyoshi Abumi, MD, Yoshihisa Kotani, MD, Jun-Ichiro Okumura, Masahiko Takahata, MD, Hideki Sudo, Eihiro Murota, Akio Minami; Hokkaido University Hospital, Sapporo, Hokkaido, Japan; Hokkaido University Sapporo, Sapporo, Hokkaido, Japan; Sapporo Municipal Hospital, Sapporo, Hokkaido, Japan; Hokkaido University Graduate School of Medicine, Sapporo, Hokkaido, Japan; Kushiro Rosai Hospital, Kushiro, Hokkaido, Japan