The femur is the long thigh bone. Repetitive or excessive loads often cause femur stress fracture. The femur overuse is the main cause, due to excessive training, walking, running, jumping, or other sport activities.
Other risk factors may include: improper bone alignment, muscle fatigue, low bone density, improper footwear, leg-length discrepancies. The common symptoms include: thigh dull ache, thigh swelling, leg bending difficulty.
Resting can often alleviate the symptoms. The patient should seek proper medical help, and avoid sport training, otherwise the pain will worsen. In some cases, surgical procedures may be required.