Sports Physician Sydney · Stress Injury Assessment
Bone Stress Injuries and Stress Reactions
Specialist assessment and evidence-informed management of stress injuries in runners, athletes, and active people. From early recognition to return to sport.
Overview
What is a bone stress injury?
A bone stress injury occurs when repeated loading exceeds the bone's ability to adapt and recover.
These injuries exist on a spectrum from early stress reaction through to stress fracture, and can occur across the body wherever bone is repeatedly loaded.
They are commonly seen in runners, field sport athletes, military and tactical populations, dancers, gymnasts, and athletes who increase training load quickly.
The spectrum
Stress reaction and stress fracture
Early recognition can reduce time away from sport and help prevent progression along the spectrum.
Stress Reaction
An earlier stage of bone stress injury where the bone is irritated and adapting under load, but a clear fracture line may not yet be present.
Stress Fracture
A more advanced bone stress injury where a fracture line may develop within the bone, often requiring a period of protected loading and structured return to sport.
Recognise it early
Common features people may notice
Symptoms vary between individuals and body regions. Early recognition supports better outcomes.
Localised pain during activity
Pain that develops in a specific area of bone during running, jumping, or repeated impact.
Pain that worsens as training continues
Discomfort that builds through a session rather than easing with warm up.
Pain after activity or the next morning
Symptoms that linger following training or feel worse the following day.
Focal tenderness over bone
A specific, reproducible tender point rather than diffuse muscular soreness.
Pain with hopping
Single leg hopping reproduces pain at the site of concern.
Reduced tolerance to impact
Impact loading becomes progressively harder to sustain compared with previous baseline.
Groin, hip, midfoot, navicular, anterior shin, or persistent night pain should be assessed promptly.
The mechanism
Why bone stress injuries happen
Bone stress injuries rarely occur because of one training session.
They usually develop when load exceeds the body's ability to adapt.
Training load, recovery, bone health, energy availability, menstrual function, previous injury, and cumulative impact from multiple activities can all influence this balance.
Framework
When load consistently outpaces adaptation, capacity is exceeded and bone tissue begins to accumulate stress.
What to consider
Risk factors
Stress injuries usually arise from an interaction of training, biological, and medical factors. Understanding these helps guide assessment and prevention.
Training factors
- Rapid increases in running volume
- Sudden increases in long runs or intensity
- Adding new impact sports during training
- Limited rest or recovery
Biological factors
- Previous bone stress injury
- Low bone mineral density
- Low energy availability
- Menstrual dysfunction
- Low BMI or recent weight loss
Medical factors
- Vitamin D deficiency
- Low calcium intake
- Corticosteroid exposure
- Relevant endocrine or inflammatory conditions
Assessment & Management
Why specialist assessment matters
Stress injuries can be difficult to judge from symptoms alone. Pain may reflect an early stress reaction, a more advanced stress fracture, or another cause of activity-related pain.
Specialist assessment helps clarify the likely diagnosis, identify contributing risk factors, guide imaging when required, and plan a safe return to activity.
BK Sports Medicine provides assessment and management of suspected stress injuries across active individuals, runners, athletes, and sporting populations.
Clinical assessment
Assessment of pain location, symptom behaviour, examination findings, and injury risk factors.
Load and activity review
Review of training progression, cumulative impact exposure, recent changes in activity, and return-to-sport demands.
Imaging guidance
Advice on when imaging may be appropriate, including MRI referral where clinically indicated.
Bone health and RED-S review
Consideration of bone health, nutrition, energy availability, menstrual function, previous injury, and relevant medical factors.
Return-to-sport planning
Structured guidance for modifying load, rebuilding capacity, and returning to running or sport safely.
Multidisciplinary coordination
Coordination with physiotherapists, dietitians, coaches, trainers, and other clinicians where required.
Consider specialist review if:
Lower limb risk profiling tool
BetaIntelliLoad is a lower limb bone stress injury risk profiling tool developed by BK Sports Medicine. It is currently in testing mode and designed as an educational reference point to help active individuals understand training load, adaptation, recovery, and lower limb bone stress injury risk.
It does not diagnose stress injury and should not replace clinical assessment, imaging, or personalised medical advice.