Surgical strategy for lumbar degenerative scoliosis (LDS) is still controversial. Some insist minimum decompression and posterior fusion especially for elder patients, while others insist longer fusion for this condition from the point of view of spinal total alignment. In this study, we performed a retrospective survey on our patients treated surgically in order to consider the preferable fusion levels for LDS. Forty-two patients were classified into two types; N type (minimum decompression according to neurological diagnosis and short fusion), and A type (long fusion according to total spine alignment). All patients exhibited more than 15 degrees of main curvature before surgery. Clininal results at the final follow-up were acceptable for both groups (JOA recovery rate; N type 53%, A type 67%). Five cases of N type received additional surgery, but none with the A type. One A type case developed deep infection, resulting in subtraction of the instrument.