Surgical outcomes in the elderly with degenerative spondylolisthesis: comparative study between patients over 80 years of age and under 80 years-a gender-, diagnosis-, and surgical method-matched two-cohort analyses

Patients older than 80 years have a higher osteoporotic status and comorbidities, which may lead to longer operative times and greater blood loss, with poorer radiographic outcomes. However, the clinical results were not affected. With appropriate patient selection, the age of >80 years is not a negative predictive factor for instrumented surgery for degenerative spondylolisthesis.