{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,21]],"date-time":"2026-01-21T23:51:28Z","timestamp":1769039488465,"version":"3.49.0"},"reference-count":36,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2020,8,9]],"date-time":"2020-08-09T00:00:00Z","timestamp":1596931200000},"content-version":"vor","delay-in-days":8,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002858","name":"China Postdoctoral Science Foundation","doi-asserted-by":"publisher","award":["2018M643121"],"award-info":[{"award-number":["2018M643121"]}],"id":[{"id":"10.13039\/501100002858","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["31670957"],"award-info":[{"award-number":["31670957"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Orthopaedic Surgery"],"published-print":{"date-parts":[[2020,8]]},"abstract":"<jats:sec><jats:title>Objective<\/jats:title><jats:p>This study aimed to investigate the strength of a novel micro\u2010dynamic pedicle screw by comparing it to the traditional pedicle screw.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Forty\u2010five lumbar vertebrae received a traditional pedicle screw on one side and a micro\u2010dynamic pedicle screw on the other side as follows (traditional group <jats:italic>vs<\/jats:italic> micro\u2010dynamic group): 15 vertebrae underwent instant pull\u2010out testing; 15 vertebrae underwent 5000\u2010cyclic fatigue loading testing; and 15 vertebrae underwent 10,000\u2010cyclic fatigue loading testing and micro\u2010computed tomography (micro\u2010CT) scanning. The peek pull\u2010out force and normalized peek pull\u2010out force after instant pull\u2010out testing, 5000\u2010cyclic and 10,000\u2010cyclic fatigue loading testing were recorded to estimate the resistance of two types of screws. Bone mineral density was recorded to investigate the strength of the different screws in osteoporotic patients. And the semidiameter of the screw insertion area on micro\u2010CT images after fatigue were compared to describe the performance between screw and bone surface.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The bone mineral density showed a weak correlation with peek pull\u2010out force (r = 0.252, <jats:italic>P<\/jats:italic> = 0.024). The peek pull\u2010out force of traditional pedicle screw after 10,000\u2010cyclic fatigue loading were smaller than that of instant pull\u2010out test in both osteoporotic (<jats:italic>P<\/jats:italic> = 0.017) and healthy group (<jats:italic>P<\/jats:italic> = 0.029), the peek pull\u2010out force of micro\u2010dynamic pedicle screw after 10,000\u2010cyclic fatigue loading was smaller than that in instant pull\u2010out test in osteoporotic group (<jats:italic>P<\/jats:italic> = 0.033), but no significant difference in healthy group (<jats:italic>P<\/jats:italic> = 0.853). The peek pull\u2010out force in traditional group and micro\u2010dynamic group underwent instant pull\u2010out testing (<jats:italic>P<\/jats:italic> =\u20090.485), and pull\u2010out testing after 5000\u2010cyclic fatigue loading testing (<jats:italic>P<\/jats:italic> =\u20090.184) did not show significant difference. However, the peek pull\u2010out force in micro\u2010dynamic group underwent pull\u2010test after 10,000\u2010cyclic fatigue loading testing was significantly greater than that measured in traditional group (<jats:italic>P<\/jats:italic> =\u20090.005). The normalized peek pull\u2010out force of traditional groups underwent instant pull\u2010out testing, pull\u2010out test after 5000\u2010cyclic and 10,000\u2010cyclic fatigue loading testing significantly decreased as the number of cycles increased (<jats:italic>P<\/jats:italic> &lt;\u20090.001); meanwhile, the normalized peek pull\u2010out force of micro\u2010dynamic groups remained consistent regardless of the number of cycles (<jats:italic>P<\/jats:italic> =\u20090.133). The semidiameter after the fatigue loading test of the traditional screw insertion area was significantly larger than that of the micro\u2010dynamic screw insertion area (<jats:italic>P<\/jats:italic> = 0.013).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>The novel micro\u2010dynamic pedicle screw provides stronger fixation stability in high\u2010cyclic fatigue loading and non\u2010osteoporotic patients <jats:italic>versus<\/jats:italic> the traditional pedicle screw, but similar resistance in low\u2010cycle fatigue testing and osteoporotic group vs the traditional pedicle screw.<\/jats:p><\/jats:sec>","DOI":"10.1111\/os.12742","type":"journal-article","created":{"date-parts":[[2020,8,10]],"date-time":"2020-08-10T06:34:11Z","timestamp":1597041251000},"page":"1285-1292","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Comparison of the Pull\u2010Out Strength between a Novel Micro\u2010Dynamic Pedicle Screw and a Traditional Pedicle Screw in Lumbar Spine"],"prefix":"10.1111","volume":"12","author":[{"given":"Lei","family":"Qian","sequence":"first","affiliation":[{"name":"Department of Anatomy, Southern Medical University Guangdong Provincial Key laboratory of Medical Biomechanics Shenzhen Digital Orthopedic Engineering Laboratory  Guangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Weidong","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Spinal Surgery Nanfang Hospital, Southern Medical University  Guangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peng","family":"Li","sequence":"additional","affiliation":[{"name":"Department of Orthopedics, The Third Affiliated Hospital Southern Medical University, Guangdong Provincial Key Laboratory of Bone and Joint Degeneration Diseases  Guangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Dongbin","family":"Qu","sequence":"additional","affiliation":[{"name":"Department of Spinal Surgery Nanfang Hospital, Southern Medical University  Guangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenjie","family":"Liang","sequence":"additional","affiliation":[{"name":"Department of Anatomy, Southern Medical University Guangdong Provincial Key laboratory of Medical Biomechanics Shenzhen Digital Orthopedic Engineering Laboratory  Guangzhou China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Minghui","family":"Zheng","sequence":"additional","affiliation":[{"name":"Department of Spinal Surgery Nanfang Hospital, Southern Medical University  Guangzhou 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