Two new studies have suggested that long-term use of oral drugs prescribed to keep treat osteoporosis may be linked with unusual fractures of the thigh bone.

However, the research is not the first of its kind to reveal an association with the drugs; known as bisphosphonates, with unusual fractures, but numerous researches has discovered the details, with the drugs reducing breast cancer risk but ibooosting the risk of painful jaw problems.

The research is scheduled for presentation Thursday at the American Academy of Orthopedic Surgeons' annual meeting in New Orleans; however, at least one expert is claiming both new studies as flawed.

The study conducted by Rosenwasser and his colleagues involved 112 women, all past menopause, who suffered from osteoporosis, which makes the bones weak and likely to break.

Also, is claimed that among them, 62 took osteoporosis drugs -- in this case, bisphosphonates -- for four years or more, and 50 took calcium and vitamin D supplements only.

They discovered that long-term use of the drugs -- at least four years -- was linked to boost the buckling ratio, outlining a higher risk for fracture.