{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,21]],"date-time":"2026-07-21T11:29:38Z","timestamp":1784633378548,"version":"3.55.0"},"reference-count":29,"publisher":"Journal of Neurosurgery Publishing Group (JNSPG)","issue":"4","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,10,1]]},"abstract":"<jats:sec>\n<jats:title>OBJECTIVE<\/jats:title>\n<jats:p>Total disc arthroplasty (TDA) has been shown to be an effective and safe treatment for cervical degenerative disc disease at short- and midterm follow-up. However, there remains a paucity of literature reporting the differences between individual prosthesis designs with regard to device performance. In this study, the authors evaluated the long-term maintenance of segmental range of motion (ROM) at the operative cervical level across a diverse range of TDA devices.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>METHODS<\/jats:title>\n<jats:p>In this study, the authors retrospectively evaluated all consecutive patients who underwent 1- or 2-level cervical TDA between 2005 and 2020 at a single institution. Patients with a minimum of 6 months of follow-up and lateral flexion\/extension radiographs preoperatively, 2 months postoperatively, and at final follow-up were included. Radiographic measurements included static segmental lordosis, segmental range of motion (ROM) on flexion\/extension, global cervical (C2\u20137) ROM on flexion\/extension, and disc space height. The paired t-test was used to evaluate improvement in radiographic parameters. Subanalysis between devices was performed using one-way ANCOVA. Significance was determined at p &lt; 0.05.<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>RESULTS<\/jats:title>\n<jats:p>A total of 85 patients (100 discs) were included, with a mean patient age of 46.01 \u00b1 8.82 years and follow-up of 43.56 \u00b1 39.36 months. Implantations included 22 (22.00%) M6-C, 51 (51.00%) Mobi-C, 14 (14.00%) PCM, and 13 (13.00%) ProDisc-C devices. There were no differences in baseline radiographic parameters between groups. At 2 months postoperatively, PCM provided significantly less segmental lordosis (p = 0.037) and segmental ROM (p = 0.039). At final follow-up, segmental ROM with both the PCM and ProDisc-C devices was significantly less than that with the M6-C and Mobi-C devices (p = 0.015). From preoperatively to 2 months postoperatively, PCM implantation led to a significant loss of lordosis (p &lt; 0.001) and segmental ROM (p = 0.005) relative to the other devices. Moreover, a significantly greater decline in segmental ROM from 2 months postoperatively to final follow-up was seen with ProDisc-C, while segmental ROM increased significantly over time with Mobi-C (p = 0.049).<\/jats:p>\n<\/jats:sec>\n<jats:sec>\n<jats:title>CONCLUSIONS<\/jats:title>\n<jats:p>Analysis by TDA device brand demonstrated that motion preservation differs depending on disc design. Certain devices, including M6-C and Mobi-C, improve ROM on flexion\/extension from preoperatively to postoperatively and continue to increase slightly at final follow-up. On the other hand, devices such as PCM and ProDisc-C contributed to greater segmental stiffness, with a gradual decline in ROM seen with ProDisc-C. Further studies are needed to understand how much segmental ROM is ideal after TDA for preservation of physiological cervical kinematics.<\/jats:p>\n<\/jats:sec>","DOI":"10.3171\/2022.2.spine22143","type":"journal-article","created":{"date-parts":[[2022,4,26]],"date-time":"2022-04-26T17:52:42Z","timestamp":1650995562000},"page":"556-562","source":"Crossref","is-referenced-by-count":5,"title":["Longitudinal assessment of segmental motion of the cervical spine following total disc arthroplasty: a comparative analysis of devices"],"prefix":"10.3171","volume":"37","author":[{"given":"Matthew W.","family":"Colman","sequence":"first","affiliation":[{"name":"Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Athan G.","family":"Zavras","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vincent P.","family":"Federico","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Michael T.","family":"Nolte","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Alexander J.","family":"Butler","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kern","family":"Singh","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Frank M.","family":"Phillips","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1754","reference":[{"issue":"21","key":"r1","series-title":"Spine (Phila Pa 1976)","doi-asserted-by":"publisher","first-page":"2310","DOI":"10.1097\/BRS.0b013e318154c57e","article-title":"Anterior cervical discectomy and fusion associated complications","volume":"32","author":"Fountas KN","year":"2007","unstructured":"Fountas KN, Kapsalaki EZ, Nikolakakos LG,  Anterior cervical discectomy and fusion associated complications. 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