Metatarsal stress fractures are overuse injuries resulting from repetitive sub-failure loading that overwhelms normal bone remodeling. They account for up to 38% of stress fractures in athletes and most commonly involve the second and third metatarsals. [1-2] Management depends critically on whether the fracture is at a low-risk (2nd–4th metatarsal shaft) or high-risk (base of 2nd metatarsal, proximal 5th metatarsal zones 2–3) location. [3-4]
1. History
- Insidious onset of forefoot pain that initially occurs only during activity and progressively worsens to occur earlier in exercise or at rest [1][5]
- Recent change in training volume, intensity, surface, or footwear (the "too much, too soon" pattern) [1]
- Timing: symptoms typically develop over days to weeks; ask about duration and trajectory
- Aggravating factors: weight-bearing, running, jumping, prolonged walking; relieved by rest
- Associated symptoms: localized swelling, difficulty with push-off, limping
- Important negatives: no acute traumatic event, no night pain or constitutional symptoms (which would raise concern for malignancy), no numbness/tingling
2. Alarm Features
- Pain at rest or night pain (may indicate progression to complete fracture or alternative diagnosis such as malignancy) [3]
- Inability to bear weight
- Proximal 5th metatarsal location (zones 2–3): high risk of nonunion (11–50% with conservative management) [6]
- Base of 2nd metatarsal stress fracture (common in dancers): high-risk site prone to delayed union [3]
- Multiple metatarsal fractures: raises suspicion for Lisfranc injury [6]
- Signs of compartment syndrome (severe pain, tense swelling, pain with passive stretch) [6]
- Features suggesting underlying metabolic bone disease or malignancy: weight loss, fever, history of cancer
3. Medications
- Acute pain control: Acetaminophen and ice are first-line [1]
- NSAIDs: Controversial — reports of increased risk of nonunion; if used, limit to <7 days and only for resting/night pain [1][7]
- Medications that increase risk: Chronic NSAID use, chronic corticosteroids, aromatase inhibitors, medroxyprogesterone (Depo-Provera) [1-2]
- Vitamin D supplementation: Check 25(OH)D level; populations with low vitamin D intake are at higher risk of BSI, and supplementation appears protective. Goal ≥20 ng/mL (50 nmol/L) at minimum; some experts recommend 30–40 ng/mL [1][8]
- Calcium: Ensure adequate intake (1,000–1,200 mg/day) [8]
4. Diet
- Screen for low energy availability (LEA) — caloric intake insufficient relative to exercise energy expenditure [9-10]
- Ensure adequate calcium intake through diet (dairy, fortified foods, leafy greens)
- Adequate protein for bone healing
- Avoid caloric restriction during recovery
- Hydration is important but not a primary driver of stress fracture risk
- Long-term: address any disordered eating patterns, especially in athletes in endurance, aesthetic, or weight-class sports [11]
5. Review of Systems
- Musculoskeletal: Pain in other bones (multifocal stress injuries), joint deformity, prior fractures
- Endocrine/Reproductive: Menstrual history in females — amenorrhea/oligomenorrhea (up to 3× more common in athletes) is a red flag for REDs [12]
- Constitutional: Weight loss, fatigue, fever (to exclude malignancy, infection)
- GI: Malabsorption symptoms (celiac disease, IBD — impair calcium/vitamin D absorption)
- Psychiatric: Mood changes, disordered eating behaviors, body image concerns
- Nutritional: Dietary restrictions, vegetarianism, caloric intake relative to training load
6. Collateral History and Family History
- Training log review: recent changes in volume, intensity, surface, footwear
- Coaching or military training regimen details
- Family history of osteoporosis, fragility fractures, or metabolic bone disease
- Social context: eating disorder history, pressure to maintain low body weight, psychological stressors
- In military recruits: poorer physical fitness on entry correlates with higher BSI rates [1]
7. Risk Factors
- Training errors: Rapid increase in volume/intensity, non-adaptive training, inadequate recovery periods [1][13]
- Sex: Female athletes have higher rates; female military recruits >3× more likely than males [1]
- Age: More common in those <20 or >40 years [1]
- Race: More common in White individuals, least common in Black individuals [1]
- Low energy availability / REDs: The most important modifiable metabolic risk factor [9][11]
- Anatomical: High foot arch, longer metatarsal length, abnormal first ray mechanics [13-14]
- Low bone mineral density and vitamin D deficiency [15-16]
- Smoking, low fitness level, low BMI or high BMI [1]
- Sport-specific: Running and military training → 2nd/3rd metatarsal; soccer → 5th metatarsal [13]
- Chronic conditions: Inflammatory arthropathies, osteoporosis, chronic corticosteroid use [2]
8. Differential Diagnosis
- Tendinopathy (extensor, peroneal): pain along tendon rather than focal bony tenderness
- Morton neuroma: interdigital pain/burning, positive Mulder click
- Metatarsophalangeal synovitis / capsulitis: joint-line tenderness, pain with passive toe ROM
- Ligamentous sprain / Lisfranc injury: midfoot tenderness, widening on weight-bearing films
- Freiberg infraction (AVN of metatarsal head): typically 2nd metatarsal head in adolescents
- Osteoid osteoma: night pain relieved by NSAIDs, characteristic nidus on CT [3]
- Bone or soft tissue malignancy: progressive pain, night pain, constitutional symptoms [3]
- Chronic osteomyelitis: history of prior infection, systemic signs [3]
- Compartment syndrome (chronic exertional): bilateral, exercise-induced tightness/pain
- Nerve entrapment: numbness, tingling, Tinel sign [1]
9. Past Medical History
- Prior stress fractures (strongest predictor of recurrence)
- Menstrual irregularities, eating disorders, or diagnosed REDs/Female Athlete Triad
- Osteoporosis or osteopenia
- Inflammatory arthropathies (RA, seronegative arthritis)
- Chronic corticosteroid use
- Prior foot surgery or deformity (bunion, hammertoe — alters metatarsal loading)
- Metabolic bone disease, celiac disease, malabsorption syndromes
10. Physical Exam
- Inspection: Localized dorsal forefoot swelling, ecchymosis (late finding)
- Palpation: Point tenderness directly over the affected metatarsal shaft is the key diagnostic finding [1][6]
- Axial loading test: Pushing the corresponding toe toward the calcaneus reproduces pain at the fracture site [6]
- Hop test: Single-leg hop reproduces focal pain (high specificity, poor sensitivity) [1]
- Heel percussion test: Percussing the heel with the palm — positive when pain localizes to the metatarsal [1]
- Tuning fork test: Vibrating 128 Hz tuning fork applied to the area of concern — conflicting evidence on utility [1]
- Neurovascular exam: Dorsalis pedis and posterior tibial pulses, capillary refill, sensation [6]
- Gait assessment: Antalgic gait, inability to bear weight
11. Lab Studies
- Not routinely needed for straightforward cases
- 25-hydroxyvitamin D level: Check in all patients with stress fractures; deficiency is a modifiable risk factor [1][8]
- Calcium, phosphorus, alkaline phosphatase: If metabolic bone disease is suspected
- CBC, ESR/CRP: If infection or malignancy is a concern
- TSH, PTH: If endocrine disorder suspected
- DXA scan: Consider in patients with recurrent stress fractures, amenorrhea, or suspected REDs [17]
- In female athletes: LH, FSH, estradiol, prolactin if menstrual dysfunction is present [12]
12. Imaging
- First-line: Plain radiographs (AP, lateral, oblique foot views) — high specificity (88–96%) but low sensitivity; often normal in the first 2–3 weeks [1][18]
- MRI without contrast: Gold standard — up to 99% sensitivity and 97% specificity. Indicated when: [1][18-19]
- Radiographs are negative but clinical suspicion remains high
- High-risk fracture location (proximal 5th metatarsal, base of 2nd metatarsal)
- Elite/competitive athlete requiring early definitive diagnosis
- Findings: periosteal edema (earliest sign, grade 1), bone marrow edema, fracture line on T1/T2 [1][19]
- Repeat radiographs in 2–3 weeks: Acceptable alternative for low-risk locations with mild symptoms and ability to reduce activity [1]
- CT: Less sensitive than MRI; useful for equivocal results or surgical planning [1]
- Ultrasound (POCUS): Can show periosteal thickening, cortical irregularity, hyperemia on Doppler; operator-dependent [1]
- Imaging is unnecessary for clinically obvious cases with classic history and exam in low-risk locations where management will not change
The following figure outlines a clinical algorithm for evaluation and management of suspected bone stress injuries: [1]
13. Special Tests
- Ottawa Foot Rules: Help determine need for radiography after acute injury (less applicable to overuse/stress fractures, but useful to exclude acute fracture) [6]
- BSI Clinical Prediction Rule: A score ≥3 raises suspicion for bone stress injury [1]
- REDs Clinical Assessment Tool (CAT2): For athletes with suspected low energy availability — categorizes severity and guides return-to-play [20]
- LEAF-Q (Low Energy Availability in Females Questionnaire): Validated screening tool for LEA in female athletes [11]
- POCUS: Emerging role as a bedside adjunct for cortical irregularity and periosteal changes [1]
14. ECG
- Not routinely indicated for metatarsal stress fractures
- Consider if evaluating an athlete with suspected REDs who has bradycardia or other cardiovascular symptoms of energy deficiency [10][21]
15. Assessment
Risk stratification by location is essential: [3-4]
Typical presentation: gradual onset of activity-related forefoot pain with focal bony tenderness. Atypical presentations include bilateral symptoms, pain at rest without prior activity-related pain, or presentation in non-athletes (consider insufficiency fracture from osteoporosis). Complications include progression to complete fracture, nonunion, malunion with transfer metatarsalgia, and recurrence if biomechanical factors are not addressed. [2]
16. Treatment Plan
Low-risk metatarsal stress fractures (2nd–4th shaft)
- Activity modification: Avoid pain-provoking activities; no activity beyond 3/10 pain [1]
- Immobilization: Walking boot, hard-soled shoe, or CAM boot for 3–6 weeks, weight-bearing as tolerated [2][6]
- Pain management: Acetaminophen, ice; avoid prolonged NSAID use [1]
- Cross-training: Cycling, swimming, pool running to maintain fitness [5][7]
- Vitamin D: Supplement if deficient; target ≥20–30 ng/mL [1][8]
- Return to activity: Once pain-free for 5 consecutive days during daily activities, initiate a graduated walk-to-run program [1][7]
- Address modifiable risk factors: Training errors, footwear, biomechanics, energy availability [1-2]
High-risk metatarsal stress fractures (proximal 5th zones 2–3, base of 2nd):
- Immobilize and refer to sports medicine or orthopedics [1][6]
- Zone 2 (Jones): Non-weight-bearing cast for 6 weeks minimum; strongly consider surgical fixation (intramedullary screw), especially in athletes [6]
- Zone 3: Non-weight-bearing cast for 6–20 weeks or surgical fixation [6]
- Base of 2nd metatarsal: Close monitoring, possible prolonged immobilization
17. Disposition
- Discharge from ED/UC with outpatient follow-up: Most low-risk metatarsal stress fractures
- Orthopedic referral indications: [6]
- Proximal 5th metatarsal zones 2 or 3 (strongly consider referral regardless)
- Displacement >3–4 mm or angulation >10°
- Multiple metatarsal fractures
- Nonunion at 3–6 months
- First metatarsal fractures that are displaced, comminuted, or intra-articular
- Concern for Lisfranc injury
- Sports medicine referral: Recurrent stress fractures, suspected REDs, need for return-to-play guidance
- Admission: Rarely needed; consider only for compartment syndrome or neurovascular compromise
18. Follow Up / Return Precautions
- Follow-up timing: Reexamine every 1–3 weeks with provocative testing and symptom assessment [1]
- Repeat radiographs: At 1–2 weeks to ensure alignment, then at 4–6 weeks to confirm healing [6]
- Repeat imaging (MRI): If pain is not improving as expected [1]
- Expected recovery: Most low-risk fractures heal in 6–8 weeks; return to sport typically by 6–12 weeks [5][7]
- Return precautions — advise patients to return immediately for:
- Sudden worsening of pain or inability to bear weight (may indicate complete fracture)
- New swelling, bruising, or deformity
- Numbness, tingling, or color change in the toes
- Pain that does not improve or worsens despite rest and immobilization
- Patient counseling: Gradual return to activity is critical; premature return risks complete fracture or recurrence. Address footwear, training load, nutrition, and bone health for long-term prevention [1-2]
References
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2. Diagnosis and Treatment of Forefoot Disorders. Section 2. Central Metatarsalgia. — Thomas JL, Blitch EL, Chaney DM, et al. The Journal of Foot and Ankle Surgery : Official Publication of the American College of Foot and Ankle Surgeons. 2009.
3. Stress Fractures of the Foot and Ankle, Part 2: Site-Specific Etiology, Imaging, and Treatment, and Differential Diagnosis. — Mandell JC, Khurana B, Smith SE. Skeletal Radiology. 2017.
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