{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,29]],"date-time":"2026-04-29T08:42:36Z","timestamp":1777452156823,"version":"3.51.4"},"reference-count":28,"publisher":"Wiley","issue":"8","license":[{"start":{"date-parts":[[2007,4,19]],"date-time":"2007-04-19T00:00:00Z","timestamp":1176940800000},"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":[[2007,8]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>Targeted remodeling of fatigue\u2010injured bone involves activation of osteoclastic resorption followed by local bone formation by osteoblasts. We studied the effect of parenteral alendronate (ALN) on bone adaptation to cyclic fatigue. The ulnae of 140 rats were cyclically loaded unilaterally until 40% loss of stiffness developed. We used eight treatment groups: (1) baseline control; (2) vehicle (sterile saline) and (3) alendronate before fatigue, no adaptation (Pre\u2010VEH, Pre\u2010ALN, respectively); (4) vehicle and (5) alendronate during adaptation to fatigue (Post\u2010VEH, Post\u2010ALN, respectively); (6) vehicle before fatigue and during adaptation (Pre\u2010VEH\/Post\u2010VEH); (7) alendronate before fatigue and vehicle during adaptation (Pre\u2010ALN\/Post\u2010VEH); (8) alendronate before fatigue and during adaptation (Pre\u2010ALN\/Post\u2010ALN). Bones from half the rats\/group were tested mechanically; remaining bones were examined histologically. The following variables were quantified: volumetric bone mineral density (vBMD); ultimate force (F<jats:sub>u<\/jats:sub>); stiffness <jats:italic>(S)<\/jats:italic>; work\u2010to\u2010failure <jats:italic>(U)<\/jats:italic>; cortical area (Ct.Ar); new woven bone tissue area (Ne.Wo.B.T.Ar); resorption space density (Rs.N\/T.Ar). Microcracking was only seen in fatigue\u2010loaded ulnae. A significant effect of alendronate on vBMD was not found. Preemptive treatment with alendronate did not protect the ulna from structural degradation during fatigue. After fatigue, recovery of mechanical properties by adaptation occurred; here a significant alendronate effect was not found. An alendronate\u2010specific effect on adaptive Ne.Wo.B.T.Ar was not found. In the fatigue\u2010loaded ulna, Rs.N\/T.Ar was increased in vehicle\u2010treated adapted groups, but not alendronate\u2010treated adapted groups, when compared with baseline control. These data suggest that short\u2010term alendronate treatment does not protect bone from fatigue in this model. Inhibition of remodeling may reduce microcrack repair over time. \u00a9 2007 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. 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