{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,6,2]],"date-time":"2025-06-02T19:29:47Z","timestamp":1748892587069},"reference-count":20,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"5","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2020,5]]},"abstract":"<jats:sec><jats:title>OBJECTIVE<\/jats:title><jats:p>A posterior dynamic deformity correction (PDDC) system was used to correct adolescent idiopathic scoliosis (AIS) without fusion. The preliminary outcomes of bridging only 3\u20134 discs in patients with variable curve severity have previously been reported. This paper examines a subgroup of patients with the authors\u2019 proposed current indications for this device who were also treated with a longer construct.<\/jats:p><\/jats:sec><jats:sec><jats:title>METHODS<\/jats:title><jats:p>Inclusion criteria included a single AIS structural curve between 40\u00b0 and 60\u00b0, curve flexibility \u2264 30\u00b0, PDDC spanning 5\u20136 levels, and minimum 2-year follow-up. A retrospective review was conducted and demographic and radiographic data were recorded. A successful outcome was defined as a curve magnitude of \u2264 30\u00b0 at final follow-up. Any serious adverse events and reoperations were recorded.<\/jats:p><\/jats:sec><jats:sec><jats:title>RESULTS<\/jats:title><jats:p>Twenty-two patients who met the inclusion criteria were operated on with the PDDC in 5 medical centers. There were 19 girls and 3 boys, aged 13\u201317 years, with Risser grades \u2265 2. Thirteen had Lenke type 1 curves and 9 had type 5 curves. The mean preoperative curve was 47\u00b0 (range 40\u00b0\u201355\u00b0). At a minimum of 2 years\u2019 follow-up, the mean major curve measured 25\u00b0 (46% correction, p &lt; 0.05). In 18 (82%) of 22 patients, the mean final Cobb angle measured \u2264 30\u00b0 (range 15\u00b0\u201330\u00b0). Trunk shift was corrected by 1.5 cm (range 0.4\u20134.3 cm). The mean minor curve was reduced from 27\u00b0 to 17\u00b0 at final follow-up (35% correction, p &lt; 0.05). For Lenke type 1 patterns, the mean 2D thoracic kyphosis was 24\u00b0 preoperatively versus 27\u00b0 at final follow-up (p &lt; 0.05), and for Lenke type 5 curves, mean lumbar lordosis was 47\u00b0 preoperatively versus 42\u00b0 at final follow-up (p &lt; 0.05). The mean preoperative Scoliosis Research Society-22 questionnaire score improved from 2.74 \u00b1 0.3 at baseline to 4.31 \u00b1 0.4 at 2 years after surgery (p &lt; 0.0001). The mean preoperative self-image score and satisfaction scores improved from preoperative values, while other domain scores did not change significantly. Four patients (18%) underwent revision surgery because of nut loosening (n = 2), pedicle screw backup (n = 1), and ratchet malfunction (n = 1).<\/jats:p><\/jats:sec><jats:sec><jats:title>CONCLUSIONS<\/jats:title><jats:p>In AIS patients with a single flexible major curve up to 60\u00b0, the fusionless PDDC device achieved a satisfactory result as 82% had residual curves \u2264 30\u00b0. These findings suggest that the PDDC device may serve as an alternative to spinal fusion in select patients.<\/jats:p><\/jats:sec>","DOI":"10.3171\/2019.11.spine19827","type":"journal-article","created":{"date-parts":[[2020,1,10]],"date-time":"2020-01-10T22:59:47Z","timestamp":1578697187000},"page":"748-754","source":"Crossref","is-referenced-by-count":6,"title":["Surgical management of moderate adolescent idiopathic scoliosis with a fusionless posterior dynamic deformity correction device: interim results with bridging 5\u20136 disc levels at 2 or more years of follow-up"],"prefix":"10.3171","volume":"32","author":[{"given":"Yizhar","family":"Floman","sequence":"first","affiliation":[{"name":"Israel Spine Center, Assuta Hospital, Tel Aviv, Israel;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ron","family":"El-Hawary","sequence":"additional","affiliation":[{"name":"IWK Health Centre Halifax, Nova Scotia, Canada;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Michael A.","family":"Millgram","sequence":"additional","affiliation":[{"name":"Israel Spine Center, Assuta Hospital, Tel Aviv, Israel;"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Baron S.","family":"Lonner","sequence":"additional","affiliation":[{"name":"Mount Sinai Hospital Icahn School of Medicine, New York, New York; and"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Randal R.","family":"Betz","sequence":"additional","affiliation":[{"name":"Institute for Spine & Scoliosis, Lawrenceville, New Jersey"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1754","reference":[{"key":"b1","series-title":"Spine Deform","doi-asserted-by":"publisher","first-page":"203","DOI":"10.1016\/j.jspd.2018.08.010","article-title":"Preclinical bench testing on a novel posterior dynamic scoliosis correction device for scoliosis","volume":"7","author":"Arnin U","year":"2019","unstructured":"Arnin U, El-Hawary R, Betz RR, Lonner BS, Floman Y: Preclinical bench testing on a novel posterior dynamic scoliosis correction device for scoliosis. 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