Non-Traumatic Ankle Pain: Causes, Diagnosis and Care

To learn more, consult the guide on Heel Pain: All Causes and How to Resolve It.

The ankle joint is a complex structure fundamental for ambulation, constantly subjected to high loads during daily and sports activities. Very often, when discomfort appears in this area, it tends to be immediately associated with a sprain or a fall. However, in clinical practice, ankle pain without trauma is an extremely frequent occurrence that requires careful evaluation. The insidious and progressive onset of the symptom, in the absence of an acute injurious mechanism, often hides biomechanical alterations, functional overloads, or systemic pathologies that require a precise diagnostic framework and a targeted rehabilitation pathway.

Anatomy and Biomechanics of the Ankle

The ankle is a complex joint formed by tibia, fibula, and talus bones with surrounding ligaments and muscles that enables weight-bearing and movement, located between the leg and foot. To fully understand the causes of non-traumatic pain, a brief review of the anatomy and biomechanics of the ankle joint complex is essential. This region is not formed by a single joint, but by a set of structures that work in synergy:

For a complete overview, see the comprehensive guide to foot and ankle pain.

• Tibio-Tarsal Joint (Talocrural): Formed by the tibia, fibula, and talus. It is responsible for dorsiflexion (bringing the tip of the foot upwards) and plantarflexion (pushing the tip downwards) movements.
• Subtalar Joint: Located between the talus and the calcaneus, it allows inversion and eversion movements, essential for the foot’s adaptation to uneven terrain.
• Ligamentous Complex: The lateral collateral ligaments (anterior talofibular, calcaneofibular, posterior talofibular) and the deltoid ligament (medial) ensure passive stability.
• Musculotendinous System: The tendons, including the Achilles tendon, posterior tibialis, anterior tibialis, and peroneals, provide active stability and motor strength.

During walking or running, the ankle must withstand forces several times the body weight. Any alteration in the distribution of these loads, even in the absence of trauma, can trigger pathological processes.

The Main Causes of Ankle Pain Without Trauma

When pain appears insidiously, the causes can be multiple and of different natures. The most common pathologies are analyzed below.

Tendinopathies

Tendinopathies represent the main cause of non-traumatic pain. The term “tendinitis” is now considered obsolete in most chronic cases, as histological studies demonstrate an absence of inflammatory cells, highlighting instead a process of collagen degeneration (tendinosis).

• Achilles Tendinopathy: Affects the largest and strongest tendon in the human body. It typically manifests with morning pain, stiffness, and localized swelling approximately 2-6 cm from the insertion on the calcaneus (mid-portion) or directly on the bone (insertional). It is caused by repeated overload, sudden changes in footwear, or training surface.
• Posterior Tibial Tendinopathy: This tendon passes behind the medial malleolus (inner) and is fundamental for maintaining the plantar arch. Its dysfunction leads to the progressive collapse of the plantar arch (acquired adult flatfoot), causing pain in the inner part of the ankle.
• Peroneal Tendinopathy: The peroneal tendons run behind the lateral malleolus (outer). Pain in this area, without sprains, is often related to excessive foot supination or silent chronic instability.

Ankle Osteoarthritis

Unlike the hip or knee, primary ankle osteoarthritis is rare. However, secondary osteoarthritis can develop due to repeated microtraumas over time, alterations in the load axis, or rheumatic pathologies. The pain is typically mechanical: it worsens with load and movement, and improves with rest. Morning stiffness that resolves in a few minutes may be present.

Rheumatoid Arthritis and Systemic Inflammatory Diseases

Rheumatoid arthritis is an autoimmune disease that affects joints symmetrically. It can start in the ankles, causing pain, significant swelling (synovitis), warmth, and prolonged morning stiffness (lasting more than 30 minutes). Other inflammatory pathologies include psoriatic arthritis and ankylosing spondylitis, which often manifest with enthesitis (inflammation at the point where the tendon inserts into the bone), as in the case of the Achilles tendon.

Gout and Pseudogout

Gout is a metabolic arthritis caused by the deposition of uric acid crystals in the joints. Although it typically affects the big toe, the ankle is another frequent site. The onset is sudden, often nocturnal, with throbbing pain, redness, extreme swelling, and inability to touch the skin.

Tarsal Tunnel Syndrome

This is an entrapment neuropathy. The posterior tibial nerve is compressed as it passes through the tarsal tunnel, a structure located behind the medial malleolus. Symptoms include burning pain, tingling, numbness, and electric shocks radiating towards the sole of the foot and toes. It worsens with prolonged standing.

Stress Fractures

Stress fractures are not caused by a single violent impact, but by the accumulation of repeated microtraumas that exceed the bone’s ability to remodel and repair itself. They are common in runners, military personnel, or those who drastically increase their volume of physical activity. The most affected bones in the ankle region are the distal tibia, fibula, talus, and navicular. The pain is pinpoint, deep, worsens with impact, and disappears at rest.

Postural and Biomechanical Alterations

An excessively pronated (flat) or supinated (cavus) foot, a leg length discrepancy, or weakness of the hip stabilizing muscles can alter the kinetic chain. This forces the ankle to work at non-physiological angles, generating shear forces that, over time, inflame tendons and joints.

Associated Symptoms and Warning Signs (Red Flags)

Pain is a subjective symptom, but its characteristics help guide the diagnosis. It is important to note if the pain is:

• Mechanical: Worsens with movement and load, typical of tendinopathies and osteoarthritis.
• Inflammatory: Present at rest, worsens at night, associated with prolonged morning stiffness.
• Neuropathic: Burning, tingling, altered sensation.

There are also “warning signs” (Red Flags) that require immediate medical evaluation:

• Constant nocturnal pain that does not change with position.
• Sudden swelling, warmth, and intense redness without apparent reason (suspicion of infection or gout).
• Fever associated with joint pain.
• Total inability to bear weight on the foot.
• Sudden loss of sensation or muscle weakness.

In the presence of these symptoms, it is imperative to promptly consult your doctor or physical therapist to rule out serious pathologies.

The Diagnostic Pathway

An accurate diagnosis is the cornerstone of effective treatment. The process always begins with a thorough clinical history. The professional will inquire about lifestyle habits, work activity, sports practiced, any recent changes in training or footwear, and previous medical history.

The physical examination includes:

• Observation: Evaluation of posture, plantar arch, symmetry, and the presence of edema or swelling.
• Palpation: Search for specific painful points on bones, ligaments, and tendons.
• Joint and Muscle Evaluation: Active and passive mobility tests (Range of Motion – ROM) and strength tests against resistance.
• Specific Orthopedic and Neurological Tests: For example, Tinel’s test for tarsal tunnel or the Heel Raise test for posterior tibialis function.

If the clinical examination is not sufficient or if structural lesions are suspected, the doctor may prescribe instrumental examinations:

• X-ray (RX): Useful for evaluating osteoarthritis, the presence of osteophytes, or ruling out fractures.
• Ultrasound: The examination of choice for soft tissues (tendons, ligaments, bursae), it allows dynamic evaluation of structures and identification of effusions or tendinosis.
• Magnetic Resonance Imaging (MRI): Offers a detailed view of all structures, including cancellous bone (for bone edema or stress fractures) and cartilage.

The Role of Physiotherapy in Treatment

Physiotherapy represents the first-line conservative approach for the vast majority of causes of ankle pain without trauma. The goal is not only to alleviate the symptom but to correct the underlying dysfunction to prevent recurrence.

Treatment is generally divided into phases, adapting to the patient’s tissue reactivity.

Acute Phase Management

In the early stages, in the presence of acute pain, the PEACE & LOVE principle is applied (which has replaced the old RICE). The focus is on joint protection, patient education, load optimization (avoiding prolonged absolute rest which weakens tissues), and promotion of vascularization.

Manual Therapy

Orthopedic manual therapy is fundamental for restoring correct arthrokinematics. Joint mobilization techniques (such as Maitland or Mulligan concepts) are used to recover dorsiflexion, often limited and a cause of overload. Myofascial release and deep transverse massage can be applied to contracted muscle bellies (e.g., calf) to reduce tension on the tendons.

Instrumental Physical Therapies

Scientific evidence supports the use of some physical therapies as adjuncts, to accelerate healing processes and modulate pain:

• Radial or Focused Shockwave Therapy: Highly effective and supported by strong clinical evidence in the treatment of chronic tendinopathies (Achilles, plantar fasciitis), as they stimulate neoangiogenesis (formation of new blood vessels) and tissue regeneration.
• High-Power Laser Therapy (ND:Yag): Useful for its biostimulating and deep anti-inflammatory effect.
• Tecar Therapy (Diathermy): Helps improve microcirculation, drain any edema, and relax contracted muscles.

Therapeutic Exercise and Load Management

Therapeutic exercise is the beating heart of rehabilitation. Musculotendinous structures respond to mechanical load through a process called mechanotransduction, strengthening and reorganizing collagen fibers.

The exercise program must be progressive:

• Isometric Exercises: Muscle contractions without joint movement. They are excellent in the initial phase because they have an analgesic effect (reduce pain) on the tendon.
• Isotonic Exercises (Concentric and Eccentric): Eccentric work (the lengthening phase of the muscle under load) is the gold standard for tendinopathies.
• Plyometric and Sport-Specific Exercises: Jumps, changes of direction, and technical movements, introduced only in the final phases for those returning to sports activity.

Furthermore, proprioceptive work is fundamental. Even without a sprain trauma, pain inhibits joint receptors, altering balance. The use of unstable boards (skimmy, bosu) helps reprogram neuromotor control.

Practical Exercises for Rehabilitation

Although every program must be customized by your doctor or physical therapist, here are some examples of commonly prescribed exercises for non-traumatic ankle pain:

• Calf Stretch (Gastrocnemius and Soleus): Facing a wall, move one leg back, keeping the heel on the ground and the knee straight (for the gastrocnemius) or slightly bent (for the soleus). Hold the position for 30-45 seconds.
• Heel Drops (Eccentric Work for the Achilles): Standing on the edge of a step, rise onto the balls of both feet, lift the healthy foot, and slowly lower (in 3-4 seconds) only with the painful foot, bringing the heel below the level of the step.
• Short Foot Exercise (Strengthening of intrinsic foot muscles): While sitting or standing, try to shorten the foot by bringing the forefoot closer to the heel, lifting the plantar arch without curling the toes.
• Dorsiflexion Mobilization: In a lunge position with the painful foot forward, push the knee forward beyond the toes, keeping the heel firmly on the ground.

Prevention and Lifestyle

Preventing the onset of ankle pain requires attention to several factors related to lifestyle and training:

• Body Weight Management: Overweight exponentially increases the mechanical load on weight-bearing joints. A reduction in body weight significantly reduces the risk of osteoarthritis and tendinopathies.
• Footwear Choice: Use shoes appropriate for the activity performed. Worn-out, too flat, or inadequately supported shoes alter gait biomechanics. For runners, it is essential to evaluate the “drop” (heel-to-toe differential) and the type of foot strike.
• Load Progression: The golden rule in sports is gradualness. Increasing training volume or intensity by no more than 10% per week allows tissues to adapt without suffering overload damage.
• Strength Training: Maintaining good strength in the calf, thigh, and gluteal muscles ensures better stability and optimal shock absorption.

Frequently Asked Questions (FAQ)