{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,27]],"date-time":"2025-05-27T15:04:57Z","timestamp":1748358297939},"reference-count":22,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2011,11,16]],"date-time":"2011-11-16T00:00:00Z","timestamp":1321401600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Journal Orthopaedic Research"],"published-print":{"date-parts":[[2012,5]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Estrogen deficiency causes postmenopausal osteoporosis. The relationship between estrogen deficiency and the high failure rate after osteoporotic fracture treatment is unclear, as is the effect of possible interventions, either with anti\u2010resorptive agents or with anabolic agents such as bone morphogenetic proteins (BMPs). To investigate the influence of estrogen deficiency as well as the effect of early intervention, forty female wistar rats underwent ovarectomy (OVX) followed by low calcium diet. Ten rats underwent sham operations, followed by normal diet. After 6 weeks, a closed midshaft femoral fracture was induced. Ten animals received a systemic bisphosphonate injection, 10 injection of BMP\u20107 in the fracture, and 10 a combination. All then received a normal diet. After 2 weeks healing was evaluated using radiographs, CT, biomechanical testing, and histology. Radiography showed significant increase of bridging in groups treated with BMP\u20107. Callus volume was higher in these groups. Bending stiffness and strength were similar between OVX and sham, and not influenced by bisphosphonates. Significant increase was seen in groups treated with BMP\u20107. Histology was in accordance with other endpoints. Early fracture healing was not affected by estrogen deficiency. While no beneficiary effect of bisphosphonate treatment was found, injection of BMP\u20107 stimulated healing in ovarectomized rats. \u00a9 2011 Orthopaedic Research Society Published by Wiley Periodicals, Inc. 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