Stress Fractures.
What is a stress fracture?
A stress fracture is a fatigue injury of bone — a small crack or severe bruising within a bone that develops from repetitive mechanical loading that exceeds the bone's capacity to remodel and repair itself. Unlike acute fractures from a single high-energy impact, stress fractures accumulate over time as the bone's repair mechanisms cannot keep pace with the damage being created by repeated loading.
Stress fractures exist on a spectrum — from bone stress reaction (where imaging shows bone marrow oedema but no visible fracture line) through to complete stress fracture (where a fracture line is visible on imaging). The bone stress continuum is clinically important because early intervention at the reaction stage prevents progression to a frank fracture and significantly shortens recovery time.
Who gets stress fractures?
Stress fractures are most common in athletes and military recruits who perform high volumes of repetitive impact activity — running, marching, jumping. Runners account for the largest proportion of stress fracture presentations in civilian healthcare, with lower limb stress fractures representing approximately 15% of all running injuries. They are more common in women than men, reflecting the contribution of lower bone density, the female athlete triad (relative energy deficiency in sport, menstrual dysfunction and low bone density), and biomechanical differences in lower limb loading.
Stress fractures also occur in non-athletes in the context of osteoporosis — where bone fragility rather than excessive loading is the primary driver — and are one of the most common complications of bisphosphonate therapy cessation.
Common sites and their clinical significance
The anatomical location of a stress fracture is the most important clinical variable — it determines imaging requirements, weight-bearing restrictions, return-to-sport timeline, and whether surgical consultation is warranted. Stress fractures are broadly classified as low-risk or high-risk based on their propensity for delayed union, non-union or complete fracture.
What are the symptoms?
The hallmark of a stress fracture is activity-related pain that develops with increasing specificity — initially only after prolonged activity, then during activity, then earlier in activity, and eventually during daily activities and at rest in more severe presentations. Unlike muscle soreness, stress fracture pain has a very specific location and is reproduced by direct palpation over the fracture site. Swelling and visible bruising may be present in superficial sites such as the metatarsals.
The key diagnostic question is whether the pain is getting worse as a training block progresses rather than improving — this pattern of progressive worsening with cumulative load is highly characteristic of bone stress injury.
How is it diagnosed?
The diagnosis begins with a thorough clinical evaluation. This includes detailed history taking of symptoms and activities, physical examination to locate tenderness or swelling, and imaging tests. X-rays may not always immediately show stress fractures — MRI or bone scans confirm the diagnosis.
MRI is the gold-standard imaging for stress fractures — it identifies bone marrow oedema at the earliest stage of the bone stress continuum, before a fracture line is visible, and provides the most accurate information about severity and healing. Plain X-ray is insensitive in the early stages (up to 50% of stress fractures are invisible on initial X-ray) but is appropriate as a first-line investigation to exclude frank fracture. CT provides the best visualisation of the fracture line itself and is used for navicular and tibial stress fractures in particular.
How can physiotherapy help?
Physiotherapy is central to stress fracture management — both in the acute phase and in the graduated return-to-load program that is the most important determinant of successful recovery and prevention of recurrence.
Load management in the acute phase involves modifying or eliminating the activities producing bone stress while maintaining as much general fitness as possible through non-impact alternatives. Pool running, swimming, cycling and upper body training maintain cardiovascular fitness during the recovery period without loading the fracture site. Weight-bearing restrictions vary by site and severity — navicular and femoral neck fractures typically require non-weight-bearing with crutches, while tibial and metatarsal fractures may allow weight-bearing in a boot or normal footwear depending on severity.
Taping and bracing to offload and stabilise the injured bone, weight-bearing guidance, and exercise programs tailored to maintain strength and fitness without aggravating the fracture are the primary acute phase interventions.
Biomechanical assessment identifies the training load, technique and equipment factors that produced excessive bone stress. Running gait analysis — addressing overstriding, cadence, foot strike pattern and pelvic drop — reduces the impact forces transmitted to the bone with each stride. Hip and gluteal weakness is a consistent finding in runners with stress fractures — the gluteal muscles act as a shock absorber during the landing phase, and their weakness increases the peak bone stress. Addressing these deficits is the most important injury prevention component.
Graduated return-to-load programming is the most critical and most frequently rushed phase of stress fracture management. The bone requires progressive loading stimulus to remodel and restore its mechanical properties — but premature return to full training before healing is complete causes recurrence. Return-to-running programs for stress fractures follow a structured progression from walking through jogging to running, with conservative time periods at each stage and imaging confirmation of healing for high-risk fractures before full training loads are resumed.
Clinical Pilates provides a useful non-impact strengthening environment during the recovery period — building hip, gluteal and core strength that is both therapeutic for current recovery and protective against recurrence. Real time ultrasound assists in retraining deep hip stabiliser activation.
Bone health assessment should accompany stress fracture management in any athlete — particularly female athletes with menstrual irregularity, very lean athletes, and older athletes. Low bone density and relative energy deficiency in sport (RED-S) are modifiable risk factors that, if unaddressed, will produce recurrent stress fractures regardless of how well the rehabilitation is managed. GP referral for DXA scanning and dietary review is appropriate in these populations.
Our physiotherapists Eliane Machado and Bethany Kippen both have experience in bone stress injuries and running-related conditions and are members of the Australian Physiotherapy Association. Eliane's doctoral research in running biomechanics is directly relevant to the gait analysis and return-to-running programming central to stress fracture rehabilitation.
To book or find out more, call us on 07 3706 3407 or book online below. We see patients from across Brisbane's southside including Tarragindi, Coorparoo, Holland Park, Greenslopes and Mt Gravatt.
A stress fracture is a fatigue injury of bone — a small crack or severe bruising within a bone that develops from repetitive mechanical loading that exceeds the bone's capacity to remodel and repair itself. Unlike acute fractures from a single high-energy impact, stress fractures accumulate over time as the bone's repair mechanisms cannot keep pace with the damage being created by repeated loading.
Stress fractures exist on a spectrum — from bone stress reaction (where imaging shows bone marrow oedema but no visible fracture line) through to complete stress fracture (where a fracture line is visible on imaging). The bone stress continuum is clinically important because early intervention at the reaction stage prevents progression to a frank fracture and significantly shortens recovery time.
Who gets stress fractures?
Stress fractures are most common in athletes and military recruits who perform high volumes of repetitive impact activity — running, marching, jumping. Runners account for the largest proportion of stress fracture presentations in civilian healthcare, with lower limb stress fractures representing approximately 15% of all running injuries. They are more common in women than men, reflecting the contribution of lower bone density, the female athlete triad (relative energy deficiency in sport, menstrual dysfunction and low bone density), and biomechanical differences in lower limb loading.
Stress fractures also occur in non-athletes in the context of osteoporosis — where bone fragility rather than excessive loading is the primary driver — and are one of the most common complications of bisphosphonate therapy cessation.
Common sites and their clinical significance
The anatomical location of a stress fracture is the most important clinical variable — it determines imaging requirements, weight-bearing restrictions, return-to-sport timeline, and whether surgical consultation is warranted. Stress fractures are broadly classified as low-risk or high-risk based on their propensity for delayed union, non-union or complete fracture.
- Low-risk stress fractures — those with good vascularity, compressive loading characteristics and reliable healing — include the fibula, metatarsal shafts (except the fifth metatarsal base), calcaneus, and medial tibial shaft. These are managed conservatively with load reduction and graduated return-to-activity programs.
- High-risk stress fractures require more aggressive management and lower threshold for surgical referral:
- Navicular stress fractures — the navicular bone at the top of the foot receives end-arterial blood supply, making healing unreliable. They are often missed on plain X-ray and require CT or MRI for diagnosis. Non-weight-bearing for six to eight weeks is the standard initial management, and return to running is typically 12 to 16 weeks from diagnosis. Inadequate management risks non-union requiring surgery.
- Femoral neck stress fractures — compression-side fractures of the femoral neck in runners are high-risk because progression to a complete fracture can result in avascular necrosis of the femoral head — a catastrophic complication. Any runner with unexplained hip or groin pain that worsens with loading and does not settle with rest requires urgent imaging to exclude this diagnosis.
- Anterior tibial cortex stress fractures — the "dreaded black line" on imaging — occur on the tension side of the tibia and have a high non-union rate. They typically require extended rest and often surgical intervention.
- Fifth metatarsal base (Jones fracture zone) — the junction of the base and shaft of the fifth metatarsal has poor blood supply and a high risk of delayed union and non-union with conservative management, particularly in athletes.
- Pars interarticularis (lumbar) — see our spondylolysis page for the specific management of lumbar stress fractures.
What are the symptoms?
The hallmark of a stress fracture is activity-related pain that develops with increasing specificity — initially only after prolonged activity, then during activity, then earlier in activity, and eventually during daily activities and at rest in more severe presentations. Unlike muscle soreness, stress fracture pain has a very specific location and is reproduced by direct palpation over the fracture site. Swelling and visible bruising may be present in superficial sites such as the metatarsals.
The key diagnostic question is whether the pain is getting worse as a training block progresses rather than improving — this pattern of progressive worsening with cumulative load is highly characteristic of bone stress injury.
How is it diagnosed?
The diagnosis begins with a thorough clinical evaluation. This includes detailed history taking of symptoms and activities, physical examination to locate tenderness or swelling, and imaging tests. X-rays may not always immediately show stress fractures — MRI or bone scans confirm the diagnosis.
MRI is the gold-standard imaging for stress fractures — it identifies bone marrow oedema at the earliest stage of the bone stress continuum, before a fracture line is visible, and provides the most accurate information about severity and healing. Plain X-ray is insensitive in the early stages (up to 50% of stress fractures are invisible on initial X-ray) but is appropriate as a first-line investigation to exclude frank fracture. CT provides the best visualisation of the fracture line itself and is used for navicular and tibial stress fractures in particular.
How can physiotherapy help?
Physiotherapy is central to stress fracture management — both in the acute phase and in the graduated return-to-load program that is the most important determinant of successful recovery and prevention of recurrence.
Load management in the acute phase involves modifying or eliminating the activities producing bone stress while maintaining as much general fitness as possible through non-impact alternatives. Pool running, swimming, cycling and upper body training maintain cardiovascular fitness during the recovery period without loading the fracture site. Weight-bearing restrictions vary by site and severity — navicular and femoral neck fractures typically require non-weight-bearing with crutches, while tibial and metatarsal fractures may allow weight-bearing in a boot or normal footwear depending on severity.
Taping and bracing to offload and stabilise the injured bone, weight-bearing guidance, and exercise programs tailored to maintain strength and fitness without aggravating the fracture are the primary acute phase interventions.
Biomechanical assessment identifies the training load, technique and equipment factors that produced excessive bone stress. Running gait analysis — addressing overstriding, cadence, foot strike pattern and pelvic drop — reduces the impact forces transmitted to the bone with each stride. Hip and gluteal weakness is a consistent finding in runners with stress fractures — the gluteal muscles act as a shock absorber during the landing phase, and their weakness increases the peak bone stress. Addressing these deficits is the most important injury prevention component.
Graduated return-to-load programming is the most critical and most frequently rushed phase of stress fracture management. The bone requires progressive loading stimulus to remodel and restore its mechanical properties — but premature return to full training before healing is complete causes recurrence. Return-to-running programs for stress fractures follow a structured progression from walking through jogging to running, with conservative time periods at each stage and imaging confirmation of healing for high-risk fractures before full training loads are resumed.
Clinical Pilates provides a useful non-impact strengthening environment during the recovery period — building hip, gluteal and core strength that is both therapeutic for current recovery and protective against recurrence. Real time ultrasound assists in retraining deep hip stabiliser activation.
Bone health assessment should accompany stress fracture management in any athlete — particularly female athletes with menstrual irregularity, very lean athletes, and older athletes. Low bone density and relative energy deficiency in sport (RED-S) are modifiable risk factors that, if unaddressed, will produce recurrent stress fractures regardless of how well the rehabilitation is managed. GP referral for DXA scanning and dietary review is appropriate in these populations.
Our physiotherapists Eliane Machado and Bethany Kippen both have experience in bone stress injuries and running-related conditions and are members of the Australian Physiotherapy Association. Eliane's doctoral research in running biomechanics is directly relevant to the gait analysis and return-to-running programming central to stress fracture rehabilitation.
To book or find out more, call us on 07 3706 3407 or book online below. We see patients from across Brisbane's southside including Tarragindi, Coorparoo, Holland Park, Greenslopes and Mt Gravatt.
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