{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,18]],"date-time":"2026-01-18T05:20:00Z","timestamp":1768713600855,"version":"3.49.0"},"reference-count":35,"publisher":"Wiley","issue":"6","license":[{"start":{"date-parts":[[2015,12,18]],"date-time":"2015-12-18T00:00:00Z","timestamp":1450396800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"name":"National Institute of Health","award":["2RO1-AR054099"],"award-info":[{"award-number":["2RO1-AR054099"]}]},{"name":"National Institute of Health","award":["2RO1-AR056834"],"award-info":[{"award-number":["2RO1-AR056834"]}]},{"name":"National Institute of Health","award":["2P20-GM104937"],"award-info":[{"award-number":["2P20-GM104937"]}]},{"name":"Lucy Lippitt Endowment"},{"name":"Translational Research Program at Boston Children's Hospital"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal Orthopaedic Research"],"published-print":{"date-parts":[[2016,6]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:label\/><jats:p>The objective of this study was to determine if an injection of a novel extracellular matrix scaffold and blood composite (EMBC) after anterior cruciate ligament (ACL) injury would have a mitigating effect on post\u2010traumatic osteoarthritis (PTOA) development in rat knees. Lewis rats underwent unilateral ACL transection and were divided into three groups as follows: (1) no further treatment (ACLT; <jats:italic>n<\/jats:italic>\u2009=\u200910); (2) an intra\u2010articular injection of EMBC on day 0 (INJ0; <jats:italic>n<\/jats:italic>\u2009=\u200911); and (3) an intra\u2010articular injection of EMBC on day 14 (INJ14; <jats:italic>n<\/jats:italic>\u2009=\u200911). Ten additional animals received capsulotomy only (<jats:italic>n<\/jats:italic>\u2009=\u200910, SHAM group). The OARSI histology scoring of the tibial cartilage and micro\u2010CT of the tibial epiphysis were performed after 35 days. The ratio of intact\/treated hind limb forces during gait was determined using a variable resistor walkway. The OARSI cartilage degradation sum score and total degeneration width were significantly greater in the ACLT group when compared to the INJ0 (<jats:italic>p<\/jats:italic>\u2009=\u20090.031, and <jats:italic>p<\/jats:italic>\u2009=\u20090.005) and INJ14 (<jats:italic>p<\/jats:italic>\u2009=\u20090.022 and <jats:italic>p<\/jats:italic>\u2009=\u20090.04) group. Weight bearing on the operated limb only decreased significantly in the ACLT group (<jats:italic>p<\/jats:italic>\u2009=\u20090.048). In the rat ACL transection model, early or delayed injection of EMBC ameliorated the significant decrease in weight bearing and cartilage degradation seen in knees subjected to ACL transection without injection. The results indicate that the injection of EMBC may slow the process of PTOA following ACL injury and may provide a promising treatment for PTOA. \u00a9 2015 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. 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