What causes a stress fracture on the UPPER tibea (right below the knee)?

A stress fracture is fracture caused by non-traumatic, cumulative overload on a bone; caused by a number of factors including overtraining, incorrect biomechanics, fatigue, hormonal imbalance, poor nutrition, and osteoporosis. Most stress fractures that are not associated with osteoporosis happen when we over exercise or exercise the wrong way. These fractures in the lower leg can happen anywhere along the leg. It depends on the type of exercise you are doing and where the repetitive strain is on the bone.  more