A stress fracture is a small crack in a bone from repetitive submaximal loading — not from a single traumatic event. They're common in runners, dancers, military recruits, and any athlete who ramps up training volume quickly.
Where they show up most
- Tibia (shin) — most common in runners
- Metatarsals (foot bones)
- Fibula (outer lower leg)
- Femur (thigh bone) — including the more serious femoral neck stress fracture
- Pelvis (sacrum, pubic ramus)
- Navicular (midfoot) — high-risk, needs urgent attention
The typical progression
Stress fractures rarely appear suddenly. They progress through stages:
- Bone stress reaction — vague aching, only with activity, resolves quickly with rest
- Symptomatic stress reaction — pain during and after activity, focal tenderness
- Stress fracture — pain at rest, sharp with any impact, unable to continue training
Catching it at stage 1 or 2 means weeks of modified activity. Waiting until stage 3 means months.
Red flags — stop training and get seen
- Focal, well-defined pain over a bone
- Pain that persists at rest
- Pain hopping on one leg
- Progressive worsening despite rest days
Common risk factors
- Sudden increase in training volume or intensity
- Hard training surfaces
- Worn or inappropriate footwear
- Nutritional deficits (low energy availability, calcium, vitamin D)
- Menstrual irregularities in female athletes (RED-S)
- Prior stress fractures
- Poor biomechanics (overpronation, leg length differences)
- Lower bone density
Diagnosis
X-rays often miss early stress fractures. MRI is the gold standard — it shows bone stress well before X-ray does. Bone scan is another option.
Management
Immediate — stop the aggravating activity. Cross-train with non-impact activity (swimming, cycling if permitted, upper body work).
Rest and healing time — most stress fractures need 6-8 weeks of protected activity. High-risk fractures (femoral neck, navicular, anterior tibia) may need longer and sometimes surgical fixation.
Address contributors — nutrition assessment, footwear analysis, gait retraining, strength deficits.
Progressive return — walk-run programs, gradual mileage build-up.
How we help
We assess the biomechanical factors contributing to bone stress, coordinate with your physician for imaging and management, provide manual therapy for compensations, and guide the progressive return to activity. Runners with a stress fracture history often benefit from ongoing gait and strength work to prevent recurrence.
If you have a persistent focal ache that gets worse with running, don't wait — early recognition dramatically shortens the recovery.