Stress Fracture – Lower Limb
Lower LimbOverview
A stress fracture is a partial or complete fracture resulting from repetitive microtrauma and cumulative loading rather than a single traumatic event, commonly affecting weight-bearing bones of the lower limb such as the tibia, fibula, metatarsals, and femur. These injuries typically develop in athletes or individuals engaged in repetitive high-impact activities and represent a continuum of bone injury from stress reaction to complete fracture. Early recognition and appropriate management are critical to prevent progression and complications.
Pathophysiology
Stress fractures result from an imbalance between bone remodelling demands and the bone's ability to adapt to repetitive loading. During normal bone remodelling, osteoclasts remove old bone while osteoblasts lay new bone; however, when loading exceeds the bone's adaptive capacity, microscopic cracks accumulate faster than they can be repaired. This is exacerbated by factors including sudden increases in training intensity or frequency, inadequate recovery time, biomechanical abnormalities (excessive pronation, leg length discrepancy), nutritional deficiencies (calcium, vitamin D), hormonal imbalances, and decreased bone mineral density. The tibial shaft and proximal fibula are most commonly affected, followed by metatarsals and femoral neck—each with varying healing timelines and complication risks.
Patient Education
Stress fractures require a period of relative or absolute rest from the aggravating activity; gradual return to loading activities following medical clearance, along with identification and correction of underlying biomechanical or training errors, is essential to prevent recurrence.
Typical Presentation
Site
Anterior or medial tibial shaft (most common), fibular shaft, second metatarsal, femoral neck, calcaneus, and occasionally the acetabulum or ilium in distance runners and endurance athletes
Quality
Focal, well-localised sharp or aching pain; described as 'bone pain' rather than muscular; may have a gnawing quality at rest
Intensity
Variable from 2–7/10 depending on stage of fracture; typically begins mild and insidious, worsening with continued activity; may be absent at rest initially but progressively worsens with activity
Aggravating
Running, jumping, hopping, high-impact activities, weight-bearing activities, rapid increases in training volume or intensity, training on hard surfaces, inadequate recovery between sessions
Relieving
Rest, cessation of the provocative activity, ice application, elevation, immobilisation, non-weight-bearing status
Associated
Localised tenderness on palpation, possible mild swelling or oedema over the fracture site, pain on hopping or single-leg stance, pain on impact-loading activities, visible muscle atrophy if chronic, altered gait pattern
Orthopaedic Tests
Fulcrum Test
Procedure
Patient seated or supine; place a fulcrum (edge of examination table or examiner's hand) under the suspected fracture site; apply gentle downward pressure to the distal limb segment, creating a bending moment across the fulcrum.
Positive Finding
Reproduction of localized pain directly over the fracture site
Sensitivity / Specificity
54% / 98%
Gaeta et al., 2005, Radiology
Interpretation
High specificity makes a positive result highly suggestive of stress fracture; negative result does not exclude fracture. Pain reproduction with this provocation indicates focal cortical irritation consistent with early-stage stress reaction.
Percussion Test (Tap Test)
Procedure
Use a percussion hammer or the edge of a reflex hammer to gently tap along the bone in a systematic pattern, starting proximal and moving distally toward the suspected fracture site.
Positive Finding
Focal increase in tenderness or sharp pain localized to the fracture site, with pain reproduction worse than at adjacent sites
Sensitivity / Specificity
60% / 97%
Gaeta et al., 2005, Radiology
Interpretation
High specificity; positive result suggests stress fracture at the site of maximal percussion tenderness. Useful for initial clinical screening. Absence does not exclude stress fracture.
Single-Leg Hop Test (Functional Hop Test)
Procedure
Patient performs single-leg hopping in place or hops forward in a straight line for 10–20 repetitions on the affected limb while monitoring for pain reproduction.
Positive Finding
Reproduction of pain or inability to complete the task due to pain in the affected limb
Sensitivity / Specificity
86% / 74%
Interpretation
High sensitivity; useful for ruling out stress fracture if negative. Positive result suggests the lesion is mechanically provoked by impact loading; must be correlated with imaging given moderate specificity.
Palpation for Focal Bone Tenderness
Procedure
Systematically palpate the length of the suspect bone with the thumb or fingertips, paying particular attention to high-risk anatomical sites (e.g., proximal tibia, fibula, femoral neck, metatarsal bases). Apply gradual, progressive pressure.
Positive Finding
Reproducible, well-localized tenderness over bone—often more pronounced than soft tissue tenderness—with a focal, tender area <3 cm in diameter
Sensitivity / Specificity
78% / 68%
Interpretation
Sensitivity supports its use as an initial screening tool; moderate specificity requires imaging confirmation. Focal bone tenderness is a key clinical feature but non-specific for stress fracture versus reactive bone changes.
Tuning Fork Test (Vibration Test)
Procedure
Strike a 128 Hz tuning fork and place the vibrating fork on the suspected fracture site (or various points along the bone); patient reports whether vibration is felt and compare sensation between sides.
Positive Finding
Markedly reduced vibration sense or absence of vibration perception at the fracture site compared to the contralateral side, or reproduction of pain with vibration
Sensitivity / Specificity
47% / 85%
Interpretation
Moderate specificity; useful as an adjunct. Positive result may indicate stress fracture-related periosteal irritation. Low sensitivity means negative result does not exclude stress fracture; historically used but less emphasized in modern practice.
Single-Leg Stance Test (Modified Weight-Bearing Tolerance)
Procedure
Patient stands on the affected limb only for up to 60 seconds, maintaining neutral posture, while assessing weight-bearing tolerance and pain.
Positive Finding
Inability to tolerate single-leg stance or reproduction of localized pain over the suspect bone within 30 seconds
Sensitivity / Specificity
See current literature / Unknown
Interpretation
Functional screening test; positive result indicates pain-limited weight-bearing capacity consistent with stress fracture. Non-specific but clinically useful for assessing load tolerance and recovery. Useful baseline for monitoring treatment response.
⚠ Red Flags
- •Severe unrelenting pain at rest suggesting displaced fracture or reflex sympathetic dystrophy
- •Signs of compartment syndrome: severe pain out of proportion, pain on passive stretch, paresthesia, pallor, pulselessness
- •Femoral neck stress fracture with displacement risk—sudden severe pain with inability to bear weight
- •Fever, systemic illness, or constitutional symptoms suggesting infection (osteomyelitis)
- •History of significant trauma with severe swelling suggesting acute fracture rather than stress fracture
- •Pulsatile mass or vascular compromise suggesting vascular injury
- •Neurological deficit or cauda equina symptoms
⚡ Yellow Flags
- •Excessive training volume or obsessive exercise behaviour suggesting compulsive overtraining
- •Disordered eating patterns, extreme weight loss, or amenorrhoea indicating Relative Energy Deficiency in Sport (RED-S)
- •Perfectionism, high anxiety, or competitive pressure contributing to overtraining
- •Social isolation or withdrawal from non-sporting activities
- •Fear-avoidance beliefs about returning to activity causing deconditioning
- •Catastrophising about prognosis or likelihood of recurrence
- •Poor adherence to rest recommendations or premature return to activity despite medical advice
Osteopathic Techniques
Region
Lower limb (entire limb and lumbar spine)
Technique
Soft Tissue
Rationale
Comprehensive soft tissue release to address myofascial restrictions, muscle guarding, and trigger points in calf musculature, tibialis anterior, peroneals, and hip musculature; reduces pain-guarding patterns and improves tissue fluid dynamics to support healing
Region
Ankle and foot
Technique
Articulation
Rationale
Gentle mobilisation of ankle and subtalar joints to restore normal plantarflexion, dorsiflexion, inversion, and eversion; corrects pronation-supination patterns that contribute to stress concentration and biomechanical overload
Region
Hip and pelvis
Technique
MET (Muscle Energy Technique)
Rationale
Treatment of hip flexor tightness (iliopsoas), tensor fasciae latae, piriformis, and gluteal muscles using MET to restore normal hip and pelvic mechanics; improves lower limb alignment and reduces compensatory stress on tibia and fibula
Region
Lumbar spine and sacroiliac joints
Technique
Articulation
Rationale
Restoration of normal segmental mobility in lumbar spine and sacroiliac joints to optimise core stability and pelvic mechanics; poor lumbar-pelvic stability increases lower limb compensatory loading and stress fracture risk
Region
Tibia and fibula (local area)
Technique
Soft Tissue
Rationale
Very gentle soft tissue work to tibialis anterior, tibialis posterior, and flexor hallucis longus to release compartmental tension and improve microcirculation; caution to avoid direct pressure over fracture site; facilitates healing and reduces pain-guarding
Region
Whole body (emphasis lower limb and lumbar spine)
Technique
Lymphatic
Rationale
Gentle lymphatic drainage techniques to enhance fluid clearance, reduce oedema, and support the body's natural healing response; particularly valuable in early-stage stress reaction before complete fracture develops
Add-On Approaches
Chinese Medicine
Acupuncture and moxibustion at local and distal points (ST36, BL57, BL60, LV3, KI3) to promote Qi flow, enhance bone healing, and reduce pain; cupping or gua sha over non-fracture areas to improve circulation; herbal medicine (Du Zhong, Gu Sui Bu) to support bone healing
Chiropractic
Spinal manipulation of lumbar spine and sacroiliac joint mobilisation to optimise spinal biomechanics and pelvic alignment; gait analysis and correction of lower limb alignment faults; foot orthotics evaluation and prescription for pronation control
Physiotherapy
Progressive graduated loading protocol (return-to-run or return-to-sport programmes), proprioceptive and balance retraining, core strengthening and hip stability exercises, gait retraining with focus on running mechanics, eccentric loading exercises once weight-bearing is permitted
Remedial Massage
Deep tissue massage to release myofascial trigger points in calf complex, anterior tibial muscles, and hip stabilisers; promotes blood flow and reduces muscle guarding; cross-friction techniques (cautiously applied) to fibrous adhesions in healing phase once acute pain subsides
Rehabilitation Exercises
Ankle plantarflexion and dorsiflexion active range of motion
Hip flexion, extension, and abduction active range of motion (supine or standing with support)
Standing calf stretch (gastrocnemius and soleus) against wall
Supine hamstring stretch using strap or towel
Hip flexor stretch (modified Thomas position) kneeling or supine
Supine glute sets and quad sets (isometric contractions)
Supine bridge hold (progressing to single-leg once weight-bearing permitted)
Clamshell exercises (side-lying hip abduction with knee bent)
Standing hip abduction with resistance band (non-affected leg initially)
Single-leg stance with upper limb support (once weight-bearing cleared)
Supine pelvic tilt and core engagement breathing exercises
Pool walking or aquatic therapy (non-weight-bearing initially, progressing to walking and running in water)
Referral Criteria
- •Any suspicion of stress fracture with inability to exclude on clinical grounds—refer for imaging (X-ray, CT, or MRI) for definitive diagnosis
- •Femoral neck or pelvic stress fractures—refer for specialist orthopaedic evaluation due to risk of displacement and complications
- •Stress fracture with evidence of compartment syndrome—urgent referral for surgical fasciotomy
- •Non-union or delayed union (no radiological evidence of healing after expected timeframe)—refer for orthopaedic specialist and possible surgical intervention
- •Signs of infection or systemic illness—refer to general practitioner or emergency department
- •Recurrent stress fractures despite appropriate management—refer for bone health assessment, metabolic screening (calcium, vitamin D, hormonal profile), and investigation of Relative Energy Deficiency in Sport
- •Inability to tolerate weight-bearing or severe functional limitation—refer to physiotherapy specialist for graduated loading protocol
- •Patient with suspected eating disorder or RED-S—refer to medical doctor, registered dietitian, and sports physician for coordinated care