✅ Medically reviewed by Dr. Tom Biernacki, DPM — Board-certified podiatrist specializing in foot & ankle surgery. View credentials.

What Is a Stress Fracture? For specialized treatment, see our foot stress fracture treatment Howell MI.

A stress fracture is a small crack in bone caused by repetitive loading rather than a single acute traumatic event. Unlike a traumatic fracture (a broken bone from a fall or impact), a stress fracture develops gradually as accumulated mechanical stress exceeds the bone’s ability to remodel and adapt. Bone is constantly remodeling in response to load—osteoclasts remove old bone and osteoblasts build new bone. When loading increases faster than the remodeling cycle can keep up, microdamage accumulates until a stress fracture forms.

Stress fractures account for 10–20% of all injuries in running athletes and are among the most common overuse injuries in physically active populations. The foot and ankle are the most common sites, accounting for approximately 50–60% of all stress fractures.

Common Sites in the Foot and Ankle

Metatarsal Stress Fractures (Most Common)

The metatarsals account for the majority of foot stress fractures, with the second and third metatarsals most commonly affected. Second metatarsal stress fractures are particularly common in runners and ballet dancers. Most metatarsal stress fractures heal well with activity modification and appropriate footwear—complete non-weight-bearing is rarely necessary.

The fifth metatarsal presents a special case. Stress fractures at the base of the fifth metatarsal (Jones fracture zone) have a notoriously high non-union rate (failure to heal) because the area has poor blood supply. Jones fractures often require surgical intervention with intramedullary screw fixation rather than conservative management, particularly in athletes wanting to return to sport quickly.

Navicular Stress Fractures (High-Risk)

Navicular stress fractures are among the highest-risk stress fractures in athletes due to their location at the central third of the navicular, an avascular zone with limited blood supply. They are frequently missed on initial X-rays and require CT or MRI for definitive diagnosis. Non-union is common without adequate treatment. Standard management involves 6–8 weeks of strict non-weight-bearing in a cast or boot. Delayed diagnosis and inadequate treatment lead to prolonged recovery and potential surgical management. Any athlete with midfoot pain should have navicular stress fracture considered even when initial X-rays are negative.

Calcaneal Stress Fractures

Calcaneal (heel bone) stress fractures produce heel pain that can be confused with plantar fasciitis. The characteristic finding is medial-lateral compression pain of the heel (squeezing both sides of the heel simultaneously)—positive in calcaneal stress fracture and typically absent in plantar fasciitis. MRI is the most sensitive imaging modality. Calcaneal stress fractures typically heal with protected weight-bearing in a boot for 6–8 weeks and rarely require surgery.

Sesamoid Stress Fractures

The sesamoid bones under the first metatarsal head are subject to extreme loading in runners, ballet dancers, and athletes who push off aggressively. Sesamoid stress fractures cause plantar big toe pain that is exacerbated by weight-bearing and resisted great toe plantarflexion. Distinguishing a sesamoid stress fracture from a bipartite sesamoid (a normal variant where the bone is in two parts from birth) requires careful radiographic comparison and bone scan or MRI. Sesamoid stress fractures have prolonged healing timelines (3–6 months) and occasionally require sesamoidectomy.

Risk Factors for Stress Fractures

Training errors are the primary cause: sudden increases in training volume or intensity (the 10% rule—don’t increase weekly mileage by more than 10% per week—exists for this reason), transition to harder running surfaces, and resumption of training after a break. Equipment issues contribute: worn-out running shoes with degraded midsole cushioning significantly increase skeletal loading.

Metabolic and hormonal factors are important in female athletes: the Female Athlete Triad (low energy availability, menstrual dysfunction, and low bone mineral density) dramatically increases stress fracture risk. Low vitamin D and calcium intake reduce bone strength. Osteoporosis/osteopenia—whether from the Female Athlete Triad, aging, steroid use, or other causes—is a significant stress fracture risk factor that should be assessed in recurrent stress fracture patients.

Diagnosis: Why X-Rays Are Often Negative Initially

Standard X-rays are often normal in the first 2–3 weeks after a stress fracture develops—the crack is too small and the bone remodeling reaction (visible as periosteal reaction or sclerosis) hasn’t yet appeared. Up to 50% of stress fractures are missed on initial X-rays. If clinical suspicion is high (appropriate mechanism + tenderness + activity-related pain) and X-rays are negative, MRI is the gold standard—it detects bone marrow edema from stress reaction before frank fracture develops and identifies stress fractures with 99% sensitivity. CT provides excellent cortical detail for assessing fracture propagation in high-risk locations (navicular, fifth metatarsal).

Treatment and Return to Sport

Treatment depends on fracture location, severity, and athlete’s goals. Low-risk stress fractures (most metatarsals, calcaneus, distal fibula) are managed with activity modification and often a walking boot for 4–6 weeks, with gradual return to running at 8–10 weeks. High-risk stress fractures (navicular, fifth metatarsal Jones zone, femoral neck, anterior tibial cortex) require more aggressive treatment—often non-weight-bearing or surgical fixation—because non-union and complete fracture risk are high.

Return to running is guided by pain resolution and clinical healing—not simply time. A pain-free run-walk progression starting on flat, soft surfaces (treadmill or track) is standard. Bone stimulators (low-intensity pulsed ultrasound) may accelerate healing in stubborn cases, particularly with delayed union or in patients with metabolic factors limiting healing.

Frequently Asked Questions

Medical References & Sources

• American Orthopaedic Foot & Ankle Society — Stress Fractures
• PubMed Research — Foot Stress Fracture Management
• PubMed Research — High-Risk Stress Fractures

Dr. Tom Biernacki, DPM is a board-certified podiatric surgeon at Balance Foot & Ankle in Howell and Bloomfield Hills, Michigan. He treats foot and ankle stress fractures with advanced imaging, conservative management, bone stimulation, and surgical fixation for high-risk fractures.

Stress Fracture Diagnosis & Treatment — Expert Foot Care

Clinical References

1. Welck MJ et al. Stress fractures of the foot and ankle. Injury. 2017;48(8):1722-1726.
2. Nattiv A et al. Stress fracture risk factors, incidence, and classification. Clin Sports Med. 2017;36(3):379-396.
3. Boden BP et al. Stress fractures. Radiol Clin North Am. 2001;39(1):183-200.