The tibia, or shinbone, is the most commonly fractured long bone in the body.A tibial shaft fracture occurs along the length of the bone, below the knee and above the ankle.The term shin splints refers to pain along the inner edge of the shinbone (tibia).Shin splints typically develop after vigorous physical activity, especially if you are just starting a fitness program.Most of these conditions are caused by overuse and stress on a part of the lower leg.Causes of shin pain include shin splints (medial tibial stress syndrome), stress fracture (small crack [s] in the tibia), …