{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,4]],"date-time":"2026-04-04T21:21:19Z","timestamp":1775337679986,"version":"3.50.1"},"reference-count":12,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2018,5]]},"abstract":"<jats:sec><jats:title>OBJECTIVE<\/jats:title><jats:p>The study aimed to determine if the intraoperative segmental lordosis (as calculated on a cross-table lateral radiograph following a single-level transforaminal lumbar interbody fusion [TLIF] for degenerative spondylolisthesis\/low-grade isthmic spondylolisthesis) is maintained at discharge and at 6 months postsurgery.<\/jats:p><\/jats:sec><jats:sec><jats:title>METHODS<\/jats:title><jats:p>The authors reviewed images and medical records of patients \u2265 16 years of age with a diagnosis of an isolated single-level, low-grade spondylolisthesis (degenerative or isthmic) with symptomatic spinal stenosis treated between January 2008 and April 2014. Age, sex, surgical level, surgical approach, and facetectomy (unilateral vs bilateral) were recorded. Upright standardized preoperative, early, and 6-month postoperative radiographs, as well as intraoperative lateral radiographs, were analyzed for the pelvic incidence, segmental lumbar lordosis (SLL) at the TILF level, and total LL (TLL). In addition, the anteroposterior position of the cage in the disc space was documented. Data are presented as the mean \u00b1 SD; a p value &lt; 0.05 was considered significant.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>Eighty-four patients were included in the study. The mean age of patients was 56.8 \u00b1 13.7 years, and 46 patients (55%) were men. The mean pelvic incidence was 59.7\u00b0 \u00b1 11.9\u00b0, and a posterior midline approach was used in 47 cases (56%). All TLIF procedures were single level using a bullet-shaped cage. A bilateral facetectomy was performed in 17 patients (20.2%), and 89.3% of procedures were done at the L4\u20135 and L5\u2013S1 segments. SLL significantly improved intraoperatively from 15.8\u00b0 \u00b1 7.5\u00b0 to 20.9\u00b0 \u00b1 7.7\u00b0, but the correction was lost after ambulation. Compared with preoperative values, at 6 months the change in SLL was modest at 1.8\u00b0 \u00b1 6.7\u00b0 (p = 0.025), whereas TLL increased by 4.3\u00b0 \u00b1 9.6\u00b0 (p &lt; 0.001). The anteroposterior position of the cage, approach, level of surgery, and use of a bilateral facetectomy did not significantly affect postoperative LL.<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSIONS<\/jats:title><jats:p>Following a single-level TLIF procedure using a bullet-shaped cage, the intraoperative improvement in SLL is largely lost after ambulation. The improvement in TLL over time is probably due to the decompression part of the procedure. The approach, level of surgery, bilateral facetectomy, and position of the cage do not seem to have a significant effect on LL achieved postoperatively.<\/jats:p><\/jats:sec>","DOI":"10.3171\/2017.8.spine161231","type":"journal-article","created":{"date-parts":[[2018,2,16]],"date-time":"2018-02-16T15:02:25Z","timestamp":1518793345000},"page":"486-491","source":"Crossref","is-referenced-by-count":11,"title":["Do intraoperative radiographs predict final lumbar sagittal alignment following single-level transforaminal lumbar interbody fusion?"],"prefix":"10.3171","volume":"28","author":[{"given":"Khalid M. 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