Dr. Mark Drakos, Orthopedic Surgeon, Answers Your Questions about Ankle & Foot Sports Injuries.
Studies have shown that there are higher stresses on your feet when running on asphalt as opposed to running on grass (reference #1). This suggests that runners who are prone to stress fractures may be at a higher risk of injury running on pavement than running on softer surfaces such as grass, a rubberized track or a treadmill.