Hi Thanks for writing I Dr. Chugh Orthopaedic surgeon The drug alendronate (bisphosphonate), which is used to treat osteoporosis, is found to be associated with unexplained aching (warning sign s) in thighbones for weeks and months before the unexplained breaks. This was mainly found in patients using this drug for long period that is more than 5 years. There are several theories as to how Fosamax causes the bone breaks. Some say the drug causes “frozen bone,” a condition that shuts down the body’s natural process of bone breakdown and regeneration. It makes bones more susceptible to clean fractures. For you prevent any hard physical activity and fall. Take ibuprofen to reduce pain and to promote bone healing you may take balanced diet rich in calcium (1000mg/day) and vitamin (1000 i.u. /day). Hope this information suffices. Take care and I shall be glad to answer any further query. Regards Dr.chugh (http://bit.ly/drmchugh)