{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,22]],"date-time":"2026-07-22T08:01:39Z","timestamp":1784707299172,"version":"3.55.0"},"reference-count":44,"publisher":"SAGE Publications","issue":"4","license":[{"start":{"date-parts":[[2026,3,5]],"date-time":"2026-03-05T00:00:00Z","timestamp":1772668800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["HIP International"],"published-print":{"date-parts":[[2026,7]]},"abstract":"<jats:sec>\n                    <jats:title>Introduction:<\/jats:title>\n                    <jats:p>We aimed to delineate the histological characteristics of the hip joint\u2019s capsule of patients undergoing hip arthroplasty (HA) for primary osteoarthritis (OA) versus femoral neck fracture (FNF).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>86 patients were included: 39 with OA and 47 with FNF. A 2\u00d72\u2009cm capsular sample was harvested near the transverse ligament. Sections (4\u2009\u00b5m thick) were stained with haematoxylin and eosin. Outcomes included capsular thickness (mm), fibrosis percentage, vascularization grade, inflammatory infiltrate, and cartilaginous metaplasia.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>\n                      Inflammatory infiltrates were present in 25.6% of OA cases and 12.8% of FNF (\n                      <jats:italic toggle=\"yes\">p<\/jats:italic>\n                      = 0.127). Superficial degenerative changes were more common in OA (48.7%) than FNF (10.6%) (\n                      <jats:italic toggle=\"yes\">p<\/jats:italic>\n                      &lt; 0.01). Cartilaginous metaplasia was higher in OA (35.9%) versus FNF (6.4%) (\n                      <jats:italic toggle=\"yes\">p<\/jats:italic>\n                      = 0.01). Vascular density showed no significant difference (\n                      <jats:italic toggle=\"yes\">p<\/jats:italic>\n                      = 0.104). Severe fibrosis was more frequent in OA (46.2%) than FNF (8.5%) (\n                      <jats:italic toggle=\"yes\">p<\/jats:italic>\n                      &lt; 0.01). Mean capsular thickness was greater in OA (5\u2009mm; IQR 4.3\u20137.1) than FNF (3.1\u2009mm; IQR 2\u20134) (\n                      <jats:italic toggle=\"yes\">p<\/jats:italic>\n                      &lt; 0.01).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions:<\/jats:title>\n                    <jats:p>The hip capsule in OA showed greater thickness, fibrosis, and cartilage metaplasia. These structural differences may influence joint stability and could partly explain differing postoperative outcomes between elective THA for OA and urgent THA for FNF.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/11207000261416040","type":"journal-article","created":{"date-parts":[[2026,3,11]],"date-time":"2026-03-11T10:47:50Z","timestamp":1773226070000},"page":"575-581","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Histopathological characterisation of the hip joint capsule: Comparative study of patients with hip osteoarthritis versus patients with femoral neck fracture"],"prefix":"10.1177","volume":"36","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0783-2646","authenticated-orcid":false,"given":"Juan I","family":"Teves","sequence":"first","affiliation":[{"name":"Hip Surgery Unit, Institute of Orthopaedics \u201cCarlos E. 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