Unfortunately, stress fractures are one of the more serious sports injuries as they often involve prolonged return times and high risk of re-injury. They occur at a rate of 20% in high-level athletes with about 90% occurring in the lower limb. How bad the stress fracture is depends on where it is and type, with Collins’ injury being one of the less common locations. Regardless, stress fractures are categorized as “high risk” or “low risk” based on how they heal.