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This study looks specifically at the relationship between crack length and propagation in compact bone. Beam\u2010shaped bone samples from sheep radii were prepared and stained with fluorochrome dyes and tested in cyclic fatigue under four\u2010point bending in an INSTRON 1341 servo\u2010hydraulic fatigue\u2010testing machine. Samples were tested at a frequency of 30\u00a0Hz and stress range of 100\u00a0MPa under load control. Specimens were sectioned transversely using a diamond saw, slides prepared and examined using epifluorescence microscopy. Cracks in transverse sections were classified in terms of their location relative to cement lines surrounding secondary osteons. Mean crack length, crack numerical density and crack surface density were examined. Short microcracks (100\u00a0\u00b5m or less) were stopped at the cement lines surrounding osteons, microcracks of intermediate length (100\u2013300\u00a0\u00b5m) were deflected as they hit the cement line, and microcracks that were able to penetrate through cement lines were longer (&gt;\u00a0400\u00a0\u00b5m). These data show that bone microstructure allows the initiation of microcracks but acts as a barrier to crack propagation.<\/jats:p>","DOI":"10.1111\/j.1469-7580.2006.00509.x","type":"journal-article","created":{"date-parts":[[2006,1,13]],"date-time":"2006-01-13T13:46:58Z","timestamp":1137160018000},"page":"81-89","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":78,"title":["Osteonal crack barriers in ovine compact bone"],"prefix":"10.1111","volume":"208","author":[{"given":"S.","family":"Mohsin","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"F. 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