Uehara M, Takahashi J, Ikegami S, et al. - Through a retrospective single-center and single-surgeon study of 72 consecutive patients who received posterior spinal fusion using pedicle screws for adolescent idiopathic scoliosis (AIS) between October 2009 and August 2015, researchers examined the association between lower instrumented vertebra (LIV) and spinal mobility 2 years following posterior spinal fusion with pedicle screws for AIS for optimal LIV selection. The median number of fused vertebrae was 9. The LIV was T11–12, L1, L2, and L3 in 15, 11, 10 and 30 patients, respectively. According to LIV, the median decrease in the fingertip-to-floor distance (FFD) at 2 years following surgery was T11–12: 0 cm, L1: 0 cm, L2: 5.5 cm, and L3: 10 cm. Limited FFD became significantly more critical as the LIV was moved downwards. At 2 years postoperatively, no important relationships between limited FFD and Scoliosis Research Society-22 patient questionnaires or pain visual analog scale scores were observed. Hence, as the LIV was moved inferiorly, FFD became significantly more restricted yet clinical outcomes seemed unmoved by limited FFD.