Costa J, et al. - Researchers retrospectively analyzed a cohort of patients submitted to minimally invasive transforaminal lumbar interbody fusion (MI-TLIF) and determined factors that can be associated with a worse postoperative outcome. Analysis of the clinical records from 283 patients revealed the main variables associated with worse prognosis (“poor” class according to Odom’s criteria) including a period of sick leave longer than 3 months before the surgery, age under 50 years, lytic spondylolisthesis, L5-S1 level and occurrence of complications. Thereby suggesting less satisfactory results after MI-TLIF among younger patients, those on a sick leave for more than 3 months before surgery or who suffered surgical complications.