Fractures may occur in the long middle part (shaft) of the thighbone, which is the largest bone in the body. The top of thighbone forms part of the hip joint. Thus, fractures in the top of the thighbone are considered hip fractures. Thighbone fractures are usually caused by falls from a height, high-speed car crashes, or collision of a car with a pedestrian. The thigh is swollen, the leg looks distorted, and people cannot stand or walk. Although a fractured thighbone may be obvious, doctors ... Seek medical help immediately if you suspect a broken leg. Treatment might involve a splint, cast, or surgery, depending on the fracture. Broken legs can take several months to heal, with... Common causes include falls, motor vehicle accidents and sports injuries. Treatment of a broken leg depends on the location and severity of the injury. A severely broken leg may require metal pins and plates to hold the fragments together. Less severe breaks may be treated with a cast or splint. A leg fracture, also known as a leg break, is a crack or break in one of the bones in the leg.