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Patients with a diagnosis of FAIS who underwent hip arthroscopy with a minimum of 1\u2010year follow\u2010up were included. The exclusion criteria were prior ipsilateral hip or knee surgery, hip T\u00f6nnis grade greater than 1, knee Kellgren\u2010Lawrence grade greater than 2, hip conditions (avascular necrosis, Legg\u2010Calv\u00e9\u2010Perthes disease, pigmented villonodular synovitis, osteoid osteoma, synovial chondromatosis, and developmental dysplasia of the hip), and spine diseases. All patients underwent knee magnetic resonance imaging preoperatively. Preoperative and short\u2010term (1\u2010year) patient\u2010reported outcomes were collected, consisting of the Hip Sports Activity Scale score, weekly sports participation, modified Harris Hip Score (mHHS), 12\u2010component International Hip Outcome Tool (iHOT\u201012) score, and visual analog pain scale (VAS) scores for the hip and the ipsilateral knee. The percentages of patients achieving the minimal clinically important difference and patient acceptable symptom state (PASS) for the mHHS and iHOT\u201012 score were calculated. Multivariate regression analysis was performed to determine the effect of IKP severity on postoperative outcomes. Subgroup analysis was performed between patients with IKP alleviation and those without IKP alleviation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Among the 107 patients included, 47 presented with preoperative IKP. Compared with patients without IKP, the IKP cohort had comparable knee structural abnormalities (all with\n                      <jats:italic>P<\/jats:italic>\n                      &gt; .05). Still, the IKP cohort showed inferior preoperative values for the mHHS (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .003), iHOT\u201012 score (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .016), hip VAS score (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .001), and weekly sports participation (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .039). Postoperatively, the IKP cohort had a lower mHHS (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .046), lower iHOT\u201012 score (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .037), and lower hip VAS score (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .003) and were less likely to achieve the PASS for the mHHS (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .021) and iHOT\u201012 score (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .049). Patients with higher knee VAS scores were less likely to achieve the PASS for the mHHS (odds ratio, 0.61;\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .023). Within the IKP group, the knee VAS score improved from 2.3 to 1.0 (\n                      <jats:italic>P<\/jats:italic>\n                      &lt; .001). Patients with alleviated IKP showed superior postoperative iHOT\u201012 scores (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .038) compared with patients with persistent IKP.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Concomitant IKP at baseline negatively affected preoperative status and short\u2010term clinical outcomes after arthroscopic treatment of FAIS. Patients with IKP were less likely to meet clinical thresholds. Most patients achieved IKP alleviation postoperatively, which was associated with superior clinical outcomes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of Evidence<\/jats:title>\n                    <jats:p>Level III, retrospective cohort study.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1016\/j.arthro.2023.10.022","type":"journal-article","created":{"date-parts":[[2023,10,27]],"date-time":"2023-10-27T07:19:53Z","timestamp":1698391193000},"page":"1490-1499","update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":5,"title":["Concomitant Ipsilateral Knee Pain Is Associated With Worse Preoperative Functional Status and Short\u2010Term Outcomes After Hip Arthroscopy in Patients With Femoroacetabular Impingement Syndrome"],"prefix":"10.1002","volume":"40","author":[{"given":"Yichuan","family":"Zhu","sequence":"first","affiliation":[{"name":"Department of 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