WHY HEEL PAIN IS COMMONLY MISDIAGNOSED AS PLANTAR FASCIITIS?
Plantar fasciitis accounts for approximately 60-70% of cases of heel pain. Because it is so common, many patients—and sometimes even healthcare providers—assume that all heel pain originates from inflammation of the plantar fascia.
However, not every patient experiences the classic symptoms of plantar fasciitis. If your heel pain:
- Persists despite months of treatment
- Occurs even while resting
- Worsens at night
- Causes burning or tingling sensations
- Is associated with swelling or pain elsewhere in the body
- Becomes worse with prolonged standing rather than during the first few steps in the morning
then another underlying cause should be considered.
Viewers can read my detailed blog on plantar fasciitis for proper understanding of the condition.
1. Baxter's Nerve Entrapment: A Frequently Missed Cause of Heel Pain
What Is Baxter's Nerve Entrapment?
Baxter's nerve entrapment refers to compression of the inferior calcaneal nerve, a branch of the lateral plantar nerve. This nerve supplies sensation and muscles around the heel. Compression of the nerve can produce symptoms that closely resemble plantar fasciitis.
Studies suggest that Baxter's nerve entrapment may account for up to 20% of chronic heel pain cases that are mistakenly diagnosed as plantar fasciitis.
Causes of Baxter's Nerve Entrapment
Several factors can increase pressure on the nerve:
- Flat feet (pes planus)
- Overpronation
- Chronic plantar fasciitis
- Heel spurs
- Obesity
- Repetitive standing or walking
- Previous foot surgery
- Tight calf muscles
Symptoms of Baxter's Nerve Entrapment
Unlike plantar fasciitis, patients often describe:
- Burning pain along the inner side of the heel
- Tingling or numbness
- Pain that increases throughout the day
- Discomfort even at rest
- Pain during prolonged standing
- Night pain
- Failure to improve with standard plantar fasciitis treatment
Morning pain may be less severe than that seen with plantar fasciitis.
Diagnosis
Diagnosis requires careful clinical examination by a Foot and Ankle Surgeon.
Clinical Findings
- Tenderness along the medial heel
- Positive Tinel's sign (tingling when tapping over the nerve)
- Weakness of foot muscles in chronic cases
Investigations
- X-rays to rule out fractures
- MRI to evaluate surrounding tissues
- Ultrasound examination
- Electromyography (EMG) and nerve conduction studies (occasionally)
Treatment of Baxter's Nerve Entrapment
Conservative Treatment
- Activity modification
- Orthotic insoles
- Stretching exercises
- Anti-inflammatory medications
- Physical therapy
- Weight reduction
Injection Therapy
Ultrasound-guided corticosteroid injections around the nerve may provide relief. Blind injection to the plantar heel area can lead to plantar fascia thinning or even tear. In my clinical practice I have seen patients with worsening of plantar heel pain due to improper injection.
Surgical Treatment
Patients who fail conservative treatment may require:
- Baxter's nerve decompression surgery
- Release of the deep fascia
- Plantar fascia release if associated with chronic plantar fasciitis
Most patients experience significant pain relief after surgical decompression.
2. Calcaneal Stress Fracture: When Heel Bone Develops Tiny Cracks
What Is a Calcaneal Stress Fracture?
The calcaneus (heel bone) bears the entire body weight during walking and running. Repetitive stress can produce microscopic cracks called stress fractures.
These fractures are common in:
- Runners
- Military recruits
- Elderly individuals with osteoporosis (most common group seen routinely in my clinical practice)
- People with vitamin D deficiency
- Athletes who suddenly increase activity levels
Causes and Risk Factors
Overuse
- Marathon running
- Prolonged walking
- High-impact sports
Bone Weakness
- Osteoporosis
- Vitamin D deficiency
- Long-term steroid use
- Poor nutrition
Symptoms
Symptoms may initially mimic plantar fasciitis but progressively worsen.
Common features include:
- Deep pain inside the heel
- Pain during weight bearing
- Pain that gradually becomes constant
- Swelling around the heel
- Limping
- Tenderness when squeezing both sides of the heel (positive squeeze test)
Unlike plantar fasciitis, morning pain is not a prominent feature.
Diagnosis
Physical Examination
The heel squeeze test is particularly helpful.
Imaging
X-rays
Often normal during the early stages.
MRI
The most sensitive investigation for detecting stress fractures.
CT scan
Useful in selected cases.
Bone Scan
May identify stress reactions before fractures become visible on X-rays.
Treatment
Rest and Activity Modification
Avoid running and impact activities.
Immobilization
- Walking boot
- Cast in severe cases
Bone Health Optimization
- Calcium supplementation
- Vitamin D supplementation
- Treatment of osteoporosis if present
Gradual Return to Activity
Most stress fractures heal within 6–12 weeks.
Surgery is rarely required.
3. Inflammatory Arthropathy: When Heel Pain Is a Sign of Systemic Disease
Heel pain may sometimes represent inflammation occurring throughout the body rather than a local foot problem.
Conditions associated with heel pain include:
- Rheumatoid arthritis
- Ankylosing spondylitis
- Psoriatic arthritis
- Reactive arthritis
These diseases cause inflammation where tendons and ligaments attach to bone, known as enthesitis.
Causes
These are autoimmune disorders in which the body's immune system attacks its own tissues.
Risk factors include:
- Family history
- Genetic predisposition
- HLA-B27 positivity
- Psoriasis
- Previous infections
Symptoms
Features suggesting inflammatory arthritis include:
- Pain in both heels
- Morning stiffness lasting over 30 minutes
- Back pain
- Swelling of joints
- Finger or toe deformities
- Fatigue
- Eye inflammation
- Skin lesions associated with psoriasis
Pain often improves with activity and worsens with prolonged rest.
Diagnosis
Blood Tests
- ESR
- CRP
- Rheumatoid factor
- Anti-CCP antibodies
- HLA-B27
Imaging
Rheumatology Consultation
An evaluation by a rheumatologist is often necessary.
Treatment
Medications
NSAIDs
Help reduce pain and inflammation.
Disease-Modifying Drugs (DMARDs)
Examples include:
- Methotrexate
- Sulfasalazine
Biologic Agents
Severe cases may require advanced medications.
Orthotics
Custom insoles reduce pressure on the heel.
Early diagnosis is important because treating the underlying disease can prevent permanent joint damage. With control of the systemic inflammation the heel pain usually subsides.
4. Fat Pad Atrophy: Loss of the Heel's Natural Cushion
What Is Heel Fat Pad Atrophy?
Underneath the heel lies a specialized cushion made of fat compartments that absorb shock during walking. Over time, this protective layer may become thin and lose elasticity.
As a result, the heel bone receives excessive pressure, producing pain.
Causes
Ageing
Natural thinning of the fat pad occurs with age.
Repeated Steroid Injections
Multiple steroid injections may accelerate fat pad degeneration.
Trauma
Injuries may disrupt the fat pad structure.
Obesity
Excessive body weight increases pressure.
Prolonged Standing
Common among teachers, healthcare workers, and factory employees.
Symptoms
Patients often describe:
- Pain directly under the centre of the heel
- A sensation of walking on hard surfaces barefoot
- Increased pain while standing for long periods
- Pain worsening on hard floors
- Relief when wearing soft shoes
Unlike plantar fasciitis, pain is not typically worst during the first steps in the morning.
Diagnosis
Physical Examination
The heel feels less padded compared with the opposite side.
Ultrasound
Can measure fat pad thickness.
MRI
Useful to rule out other conditions.
Treatment
Footwear Modifications
Soft cushioned shoes are essential.
Silicone Heel Cups
Provide additional shock absorption.
Custom Orthotics
Reduce pressure on the heel.
Activity Modification
Avoid prolonged standing on hard surfaces.
Weight Reduction
Can significantly decrease symptoms.
Injectable Fillers
Rarely used in selected cases.
Surgical Treatment
Usually unnecessary.
HOW IS HEEL PAIN DIAGNOSED CORRECTLY?
A detailed history and physical examination remain the most important tools.
Your orthopaedic foot and ankle specialist may recommend:
X-rays
To evaluate bone abnormalities and fractures.
Ultrasound
Useful for plantar fascia injuries and fat pad problems.
MRI
Provides excellent assessment of soft tissues, nerves, and stress fractures.
Blood Tests
Necessary if inflammatory arthritis is suspected.
Nerve Conduction Studies
Helpful in suspected nerve entrapment.
Accurate diagnosis prevents unnecessary treatments and ensures a faster recovery.
When Should You See a Foot and Ankle Specialist?
Seek medical attention if:
- Heel pain persists beyond six weeks
- Conservative treatment is not helping
- Pain occurs at night
- There is numbness or burning sensation
- Swelling is present
- Both heels are painful
- Pain is associated with back pain or joint stiffness
- Walking becomes difficult
Persistent heel pain should never be ignored.
Key Takeaway
Although plantar fasciitis remains the most common cause of heel pain, not every painful heel is plantar fasciitis. Conditions such as Baxter's nerve entrapment, calcaneal stress fractures, inflammatory arthropathy, and heel fat pad atrophy are frequently overlooked and may require entirely different treatment strategies.
Patients who continue to experience heel pain despite stretching exercises, medications, or shoe modifications should undergo a comprehensive evaluation by a foot and ankle specialist. Early diagnosis allows targeted treatment, prevents chronic pain, and helps patients return to normal activities faster.
Remember—heel pain is a symptom, not a diagnosis. Identifying the true cause is the key to successful treatment.
Frequently Asked Questions
1. Can heel pain occur without plantar fasciitis?
Yes. Baxter's nerve entrapment, stress fractures, inflammatory arthritis, and fat pad atrophy are important causes of heel pain and may mimic plantar fasciitis.
2. How can I tell if my heel pain is not plantar fasciitis?
Pain associated with burning, numbness, night symptoms, swelling, bilateral involvement, or failure to improve after several weeks of treatment should be evaluated further.
3. Is an MRI necessary for heel pain?
MRI is usually not required initially but becomes useful when symptoms persist or when conditions like stress fractures or nerve entrapment are suspected.
4. Can inflammatory arthritis cause heel pain?
Yes. Rheumatoid arthritis, ankylosing spondylitis, and psoriatic arthritis commonly cause inflammation around the heel and may present as persistent heel pain.
5. Are steroid injections safe for heel pain?
Steroid injections may provide temporary relief in selected patients but repeated injections can lead to complications such as fat pad atrophy and plantar fascia rupture. In my clinical practice, I rarely use local injections due to high risk of complications.
6. When should surgery be considered?
Surgery is rarely needed and is reserved for patients with persistent symptoms who have failed appropriate conservative treatment or have specific conditions like Baxter's nerve entrapment requiring nerve decompression.
If you are a patient from Thane, Mumbai or Navi Mumbai schedule a consultation with Dr Vivek Maurya for comprehensive foot and ankle evaluation and evidence-based treatment.