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Patients diagnosed with FAIS and undergoing hip arthroscopic treatment were included. Exclusion criteria were incomplete magnetic resonance imaging (MRI) data, prior history of hip surgery, labral reconstruction, and concomitant hip conditions. MRI (noncontrast 3.0 T) was performed preoperatively and 3, 6, and 12 months postoperatively, and the measurement of the largest femoral neck fluid thickness (FTM) and cross\u2010sectional area (CSA) of the effusion\u2010synovitis were collected. Preoperative and a minimum of 2\u2010year postoperative patient\u2010reported outcome (PRO) scores including visual analog scale (VAS), modified Harris Hip Score (mHHS), and International Hip Outcome Tool, 12\u2010component form (iHOT\u201012) were collected and compared. Postoperative Tegner Activity Scale was also collected. The PROs and achievements of minimal clinically important difference (MCID) and patient acceptable symptom state (PASS) were compared between patients with and without postoperative effusion\u2010synovitis. Multivariate linear regression analysis was performed to determine the effect of the effusion\u2010synovitis size on PROs.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      A total of 61 patients (61 hips) were included in the study. The 3\u2010month postoperative FTM, CSA, and grade of effusion\u2010synovitis presented a significant increase compared with the preoperative values (all\n                      <jats:italic>P<\/jats:italic>\n                      &lt; .05). No significant differences were observed in the 6\u2010month postoperative measurements compared with the preoperative values (all\n                      <jats:italic>P<\/jats:italic>\n                      &gt; .05). At the 12\u2010month follow\u2010up, although there was a significant decrease in all measurements compared with the preoperative values (all\n                      <jats:italic>P<\/jats:italic>\n                      &lt; .001), 39 patients (63.9%) still presented effusion\u2010synovitis. Compared with the other 22 patients (36.1%) without effusion\u2010synovitis, these patients presented inferior mHHS, iHOT\u201012 (all\n                      <jats:italic>P<\/jats:italic>\n                      &lt; .05), as well as lower achievement of PASS of mHHS (82.1% vs 100%,\n                      <jats:italic>P<\/jats:italic>\n                      = .035) and iHOT\u201012 (38.5% vs 81.8%,\n                      <jats:italic>P<\/jats:italic>\n                      = .001). The achievement of MCID of mHHS (79.5% vs 77.3%,\n                      <jats:italic>P<\/jats:italic>\n                      = .839) and iHOT\u201012 (89.7% vs 95.5%,\n                      <jats:italic>P<\/jats:italic>\n                      = .839) were comparable between patients with and without effusion\u2010synovitis. The postoperative sagittal CSA (beta = \u2013.302,\n                      <jats:italic>P<\/jats:italic>\n                      = .039) were negatively related to mHHS in the regression analysis.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>After arthroscopic treatment for FAIS, the level of effusion\u2010synovitis presented an initial increase, then followed by a subsequent decrease. Effusion\u2010synovitis was significantly alleviated at 12 months compared with the preoperative level. Patients with postoperative effusion\u2010synovitis had inferior clinical outcomes and lower achievement of PASS compared to those without.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of Evidence<\/jats:title>\n                    <jats:p>Level IV, retrospective case series.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1016\/j.arthro.2024.08.021","type":"journal-article","created":{"date-parts":[[2024,8,28]],"date-time":"2024-08-28T13:34:09Z","timestamp":1724852049000},"page":"1788","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":2,"title":["Postoperative Effusion\u2010Synovitis Is Associated With Poor Clinical Outcomes in Patients With Femoroacetabular Impingement Syndrome"],"prefix":"10.1002","volume":"41","author":[{"given":"Yichuan","family":"Zhu","sequence":"first","affiliation":[{"name":"Department of Sports Medicine Institute of Sports Medicine of Peking University Peking University Third Hospital. Beijing Key Laboratory of Sports Injuries. Engineering Research Center of Sports Trauma Treatment Technology and Devices Ministry of Education Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hongli","family":"Wang","sequence":"additional","affiliation":[{"name":"Department of Sports Medicine Institute of Sports Medicine of Peking University Peking University Third Hospital. Beijing Key Laboratory of Sports Injuries. Engineering Research Center of Sports Trauma Treatment Technology and Devices Ministry of Education Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kesheng","family":"Wu","sequence":"additional","affiliation":[{"name":"Department of Sports Medicine Institute of Sports Medicine of Peking University Peking University Third Hospital. Beijing Key Laboratory of Sports Injuries. Engineering Research Center of Sports Trauma Treatment Technology and Devices Ministry of Education Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuo","family":"Luan","sequence":"additional","affiliation":[{"name":"Department of Sports Medicine Institute of Sports Medicine of Peking University Peking University Third Hospital. Beijing Key Laboratory of Sports Injuries. Engineering Research Center of Sports Trauma Treatment Technology and Devices Ministry of Education Beijing China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yanni","family":"Zhang","sequence":"additional","affiliation":[{"name":"Department of Sports Medicine Institute of Sports Medicine of Peking University Peking University Third Hospital. Beijing Key Laboratory of Sports Injuries. 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