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However, the current CDA indication criteria, based on the preoperative segmental range of motion (ROM), comprises a wide range of variability. Although the arthroplasty level preserved ROM averages 7\u00b0-9\u00b0 after CDA, there are no clear guidelines on preoperatively limited or excessive ROM at the index level, which could be considered as suitable for CDA.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>This was a retrospective study of patients who underwent CDA between January 2008 and October 2018 using Prestige-LP discs in our hospital. They were divided into the small-ROM (\u22645.5\u00b0) and the large-ROM (&gt;\u200912.5\u00b0) groups according to preoperatively index-level ROM. Clinical outcomes, including the Japanese Orthopedics Association (JOA), Neck Disability Index (NDI), and Visual Analogue Scale (VAS) scores, were evaluated. Radiological parameters, including cervical lordosis, disc angle (DA), global and segmental ROM, disc height (DH), and complications were measured.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      One hundred and twenty six patients, with a total of 132 arthroplasty segments were analyzed. There were 64 patients in the small-ROM and 62 in the large-ROM group. There were more patients diagnosed with cervical spondylosis in the small-ROM than in the large-ROM group (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0=\u20090.046). Patients in both groups had significantly improved JOA, NDI, and VAS scores after surgery, but the intergroup difference was not significant. Patients in the small-ROM group had dramatic postoperative increase in cervical lordosis, global and segmental ROM (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0&lt;\u20090.001). However, there was a paradoxical postoperative decrease in global and segmental ROM in the large-ROM group postoperatively (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0&lt;\u20090.001). Patients in the small-ROM group had lower preoperative DH (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0=\u20090.012), and a higher rate of postoperative heterotopic ossification (HO) (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0=\u20090.037).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Patients with preoperatively limited segmental ROM had severe HO, and achieved similar postoperative clinical outcomes as patients with preoperatively excessive segmental ROM. Patients with preoperatively limited segmental ROM showed a postoperative increase in segmental mobility, which decreased in patients with preoperatively excessive segmental ROM.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12891-020-03419-7","type":"journal-article","created":{"date-parts":[[2020,7,13]],"date-time":"2020-07-13T12:03:23Z","timestamp":1594641803000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Effect of preoperative segmental range of motion on patient outcomes in cervical disc arthroplasty"],"prefix":"10.1186","volume":"21","author":[{"given":"Ting-kui","family":"Wu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hao","family":"Liu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chen","family":"Ding","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xin","family":"Rong","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jun-bo","family":"He","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kang-kang","family":"Huang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ying","family":"Hong","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bei-yu","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2020,7,13]]},"reference":[{"issue":"1","key":"3419_CR1","doi-asserted-by":"publisher","first-page":"7","DOI":"10.3171\/2016.11.SPINE16746","volume":"27","author":"TH Lanman","year":"2017","unstructured":"Lanman TH, Burkus JK, Dryer RG, Gornet MF, McConnell J, Hodges SD. 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