Whether interior or exterior, sliding barn-style doors require a track and related hardware. Prices are based on the amount of weight the system can hold, size, basic durability, number of tracks (one door or two) and style (interior hardware is often more decorative).
A pathologic fracture is a bone fracture caused by disease that led to weakness of the bone structure. This process is most commonly due to osteoporosis, but may also be due to other pathologies such as: cancer, infection, inherited bone disorders,or a bone cyst.
1 Most commonly, this type of break is from cancer in the bone, which has often traveled from other sites in the body (called metastasis), such as from the prostate, breast, or lungs.  Pathologic fracture can also occur with other diseases, such as Paget's disease of bone and infection of bone (osteomyelitis).