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They were evaluated at five time points (preoperation and 3\u00a0months, 6\u00a0months, 1 year and 2 years postoperatively). The main results examined the rate of return to sports, American Orthopaedic Foot and Ankle Society Score (AOFAS), Foot and Ankle Ability Measure (FAAM), visual analogue scale (VAS), centre of pressure (COP) excursion velocity, time to boundary (TTB), plantar pressure, isokinetic muscle strength and complications.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Compared with the open group, the arthroscopic group demonstrated a significantly shorter period of return to the preinjury sport (13.2\u2009\u00b1\u20092.4 weeks vs. 18.7\u2009\u00b1\u20093.1 weeks,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.023) and a higher early sport ratio (80.6 vs. 61.8%,\n                      <jats:italic>P<\/jats:italic>\n                      \u2009=\u20090.011) combined with better FAAM sports and AOFAS at 3\u00a0months and 6\u00a0months postoperatively and VAS at 3\u00a0months postoperatively. In addition, better anterior\u2013posterior postural control stability, less time to peak force under lateral hindfoot and better dorsiflexion strength were shown in the arthroscopic group at 6\u00a0months postoperatively. No significant difference was found in clinical scores, posture control or muscle strength at the 1\u2010 or 2\u2010year follow\u2010up between the two groups.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Shorter period and higher rates of return to sport activities and better clinical scores, posture control and muscle strength were achieved in the arthroscopic group at 6\u00a0months postoperatively, and no clinical differences were found between arthroscopic and open modified Brostr\u00f6m procedure 1 year or 2 years postoperatively. Arthroscopic modified Brostr\u00f6m procedure is a reliable procedure for CLAI injuries with the demand for fast exercise recovery.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Clinical registration<\/jats:title>\n                    <jats:p>ChiCTR1900023999.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of evidence<\/jats:title>\n                    <jats:p>II.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00167-022-06961-0","type":"journal-article","created":{"date-parts":[[2022,4,13]],"date-time":"2022-04-13T12:03:19Z","timestamp":1649851399000},"page":"3570-3578","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":56,"title":["Arthroscopic modified Brostr\u00f6m procedure achieves faster return to sports than open procedure for chronic ankle instability"],"prefix":"10.1002","volume":"30","clinical-trial-number":[{"clinical-trial-number":"chictr1900023999","registry":"10.18810\/chictr"}],"author":[{"given":"Zong\u2010chen","family":"Hou","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Sports Medicine of Peking University Third Hospital Institute of Sports Medicine of Peking University, Beijing Key Laboratory of Sports Injuries No.49 North Garden Road, Haidian 100191 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tong","family":"Su","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Sports Medicine of Peking University Third Hospital Institute of Sports Medicine of Peking University, Beijing Key Laboratory of Sports Injuries No.49 North Garden Road, Haidian 100191 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ying\u2010fang","family":"Ao","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Sports Medicine of Peking University Third Hospital Institute of Sports Medicine of Peking University, Beijing Key Laboratory of Sports Injuries No.49 North Garden Road, Haidian 100191 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yue\u2010lin","family":"Hu","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Sports Medicine of Peking University Third Hospital Institute of Sports Medicine of Peking University, Beijing Key Laboratory of Sports Injuries No.49 North Garden Road, Haidian 100191 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Chen","family":"Jiao","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Sports Medicine of Peking University Third Hospital Institute of Sports Medicine of Peking University, Beijing Key Laboratory of Sports Injuries No.49 North Garden Road, Haidian 100191 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Qin\u2010wei","family":"Guo","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Sports Medicine of Peking University Third Hospital Institute of Sports Medicine of Peking University, Beijing Key Laboratory of Sports Injuries No.49 North Garden Road, Haidian 100191 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuang","family":"Ren","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Sports Medicine of Peking University Third Hospital Institute of Sports Medicine of Peking University, Beijing Key Laboratory of Sports Injuries No.49 North Garden Road, Haidian 100191 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nan","family":"Li","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> Research Center of Clinical Epidemiology Peking University Third Hospital No.49 North Garden Road, Haidian 100191 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dong","family":"Jiang","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Sports Medicine of Peking University Third Hospital Institute of Sports Medicine of Peking University, Beijing Key Laboratory of Sports Injuries No.49 North Garden Road, Haidian 100191 Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2022,4,13]]},"reference":[{"key":"e_1_2_10_2_2","doi-asserted-by":"publisher","DOI":"10.1177\/23259671211015207"},{"key":"e_1_2_10_3_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00167\u2010004\u20100530\u20108"},{"key":"e_1_2_10_4_2","doi-asserted-by":"publisher","DOI":"10.1007\/s00064\u2010019\u20100595\u20107"},{"issue":"5","key":"e_1_2_10_5_2","first-page":"551","article-title":"Sprained ankles. 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October 2021","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"23 March 2022","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"13 April 2022","order":3,"name":"first_online","label":"First Online","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The authors declare that they have no competing interests.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"The research was approved by the IRB Medical Committee (IRB00006761-M2019164), and written informed consents were obtained from the subjects.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not 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