In Chile, personal history of stress fracture is managed by general medicines. Stress fractures are partial or complete fractures of bone that arise from repetitive sub-failure loading rather than a single high-energy event. Annual incidence in distance runners reaches 20% in some cohorts and exceeds 30% per year in military recruits during basic training.
Stress fracture (ICD-10: M84.3) is a fatigue or insufficiency failure of bone caused by repetitive mechanical loading that exceeds the bone's adaptive remodeling capacity. The continuum of bone stress injury (BSI) progresses from periosteal edema through marrow edema, cortical microtrauma, partial cortical fracture (stress fracture), and ultimately complete fracture. The Fredericson MRI grading classifies tibial BSI from grade 1 (mild periosteal edema only) through grade 4 (visible fracture line) and predicts return-to-sport time. Anatomic site determines management: low-risk lesions (posteromedial tibia, fibula, sacrum, pubic ramus, second through fourth metatarsal shafts, calcaneus) have abundant compressive blood supply and reliably heal with conservative care; high-risk lesions (superior cortex of femoral neck, anterior tibial cortex 'dreaded black line', medial malleolus, talar neck, navicular, base of fifth metatarsal, sesamoid bones, patella, pars interarticularis) sit on the tension side of loading, in watershed blood supply, or in load-bearing locations where non-union and progression to complete fracture are common.
The key symptoms of Personal history of stress fracture are: Insidious onset of activity-related bone pain at a specific anatomic site that begins during or shortly after running, jumping, or marching and worsens with continued loading., Pain that progresses from end of activity, to during activity, to with daily walking, and finally to rest pain — the diagnostic-grade progression suggesting high-grade bone stress injury., Localized point tenderness directly over the bone (e.g., medial tibial border, dorsum of midfoot, dorsal sacrum) reproducible by direct palpation., Pain reproduced by a single-leg hop test or focal percussion of the suspected bone — sensitivity 70-90% for tibial and metatarsal lesions., Pain on the fulcrum test (femoral or tibial) and on the FABER (flexion-abduction-external rotation) and FADIR (flexion-adduction-internal rotation) tests for hip and pelvis lesions., Localized swelling, warmth, and palpable callus over a metatarsal or tibial border in subacute and healing stress fractures., Antalgic gait with shortened stance phase on the affected side and reluctance to bear weight in higher-grade lesions..
Diagnosis combines a focused history, examination, and confirmatory imaging. The history details onset (insidious activity-related pain), recent training changes (volume, intensity, surface, footwear), nutritional and menstrual history, prior injury, and bone-relevant medications. Examination locates point tenderness over specific bony landmarks (medial tibial border, dorsum of midfoot, navicular tubercle, sacrum, pars interarticularis), checks for swelling and warmth, and applies provocation tests: single-leg hop test for tibia and metatarsals, fulcrum test for femoral shaft, single-leg extension test (Stork test) for pars interarticularis, and FABER/FADIR for femoral neck and pelvis. Imaging strategy depends on suspicion and site. Plain radiographs are 15-35% sensitive for stress fractures within the first 2 weeks but rise to 50-70% sensitivity at 4-6 weeks; they detect cortical thickening, periosteal reaction, and visible fracture lines. MRI is the gold standard for early detection with 95-100% sensitivity within days of symptom onset, distinguishes bone stress injury from soft-tissue mimics, and grades severity using the Fredericson (tibia) or Arendt (foot) systems. CT is useful for navicular and pars stress fractures where MRI is equivocal. Bone scintigraphy with technetium-99m MDP has near-100% sensitivity but limited specificity and has largely been replaced by MRI. DXA bone density measurement is recommended in any athlete with recurrent stress fracture, RED-S features, or trabecular-rich site fracture (sacrum, pelvis, femoral neck). Laboratory workup in recurrent or atypical cases includes vitamin D, calcium, phosphorus, thyroid function, parathyroid hormone, urine pregnancy test, menstrual history, and energy availability assessment. Risk stratification (high-risk vs low-risk site) determines treatment urgency and modality.
Outcome is excellent for low-risk stress fractures: 90-95% of athletes return to pre-injury performance within 8-16 weeks with adherent rehabilitation. High-risk lesions detected early have similarly good outcomes when treated aggressively, with 80-95% return-to-sport. Late or missed diagnosis of high-risk lesions (especially femoral neck and anterior tibia) risks complete fracture, non-union, and career-ending complications. Recurrence rate is 12-21% in athletes returning to the same training environment without addressing risk factors. Female athletes with persistent low energy availability and menstrual dysfunction have 2-4× higher recurrence; restoration of normal cycles and energy availability roughly normalizes future risk. Long-term bone density may remain reduced after RED-S-related stress fractures, conferring elevated lifetime fragility-fracture risk if not addressed.
Suspected stress fracture in an athlete warrants sports medicine or orthopaedic assessment. High-risk sites (femoral neck, anterior tibia, navicular, base of fifth metatarsal, talar neck, sesamoids, pars interarticularis) require urgent specialist evaluation because delay or premature return to activity risks complete fracture, non-union, and career-altering complications. Recurrent stress fractures or those occurring in atypical locations warrant comprehensive bone health and energy availability assessment with endocrinology and dietitian input.
Find specialists →Low-risk stress fractures: pain-free walking 2-4 weeks, pain-free jogging 6-8 weeks, full return-to-sport 8-12 weeks. High-risk stress fractures: pain-free walking 4-8 weeks, pain-free running 12-16 weeks, return-to-sport 16-24 weeks (faster with surgical fixation). Energy availability and menstrual cycle restoration require 6-12 months. Bone density recovery after RED-S takes 12-24 months of restored energy availability and menses.
During healing, maintain cardiovascular fitness with cross-training. After clearance, follow a graded program: pain-free walking 7-10 days, walk-jog intervals 2-4 weeks, slow continuous running 2-4 weeks, and progressive volume increase by no more than 10% weekly. Maintain at least 1 rest day per week. Resume competitive training when at 80-90% of pre-injury performance pain-free.
Choose a sports medicine physician with athlete experience, ideally affiliated with a high-volume university or professional sports program. Look for access to MRI, running gait analysis, DXA bone density, and integrated services (dietitian, physical therapist, mental health). For high-risk fractures or surgical consideration, an orthopaedic surgeon with sports-fracture experience is needed. Female athletes with recurrent fractures benefit from a coordinated Female Athlete Triad / RED-S program.
Medically reviewed by AIHealz Medical Editorial Board · May 13, 2026
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