Tarsal tunnel syndrome (TTS) is a painful foot condition that happens when the posterior tibial nerve becomes compressed or squeezed. This nerve runs through the tarsal tunnel, a narrow pathway on the inside of your ankle formed by ankle bones and a thick band of protective ligaments.
When the nerve is pinched within this tight space, it triggers painful, nerve-related symptoms that can radiate across your foot and ankle.
Tarsal Tunnel Syndrome
Functional Tests
December 2035-Present
Positive Tinel's test; possible decrease in pulse.
Clinicians use targeted movement tests to place the foot in specific angles. This intentionally shrinks the tarsal tunnel space or stretches the nerve to reproduce the patient’s symptoms:
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Dorsiflexion-Eversion Test: The doctor bends the ankle upward and turns the foot outward for 5 to 10 seconds. This stretches the nerve and spikes tunnel pressure, flaring up burning or tingling.
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Triple Compression Stress Test: The clinician bends the ankle downward, turns the heel inward, and applies steady finger pressure over the nerve for 30 seconds. Replicating these angles triggers immediate numbness or shooting pain.
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Plantarflexion-Inversion Test: The ankle is bent downward and rolled inward, which significantly raises pressure around the inner ankle to provoke underlying nerve irritation.
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Motor Deficit Testing: The patient spreads their toes or flexes their big toe against resistance. Weakness reveals that nerve compression has progressed to damaging the foot's muscles.
PA and Tissue Inspection
December 2035-Present
1. Visual Observation
The exam begins with the patient standing and walking so the clinician can observe the foot's structure under weight-bearing conditions:
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Foot Alignment: Checking for flat feet or overpronation (ankles rolling inward), which stretches the nerve.
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Localized Swelling: Looking for puffiness or a lack of definition behind the inner ankle bone, indicating fluid buildup.
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Visible Masses: Scanning for bulging varicose veins, bone spurs, or cysts crowding the tunnel.
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Muscle Atrophy: Checking for visible flattening on the bottom of the foot, which points to severe, long-term nerve starvation.
2. Palpation (Physical Touch and Nerve Testing)
The clinician uses physical pressure to isolate the pain source and trigger telling nerve responses:
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Deep Tunnel Tenderness: Pressing firmly into the tarsal tunnel pathway causes pronounced, localized aching.
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Tinel’s Sign: Tapping the nerve sends a sudden electric shock or pins-and-needles radiating down into the foot.
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Valleix’s Sign: Tapping the nerve causes a tingling sensation to shoot upward into the calf.
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Physical Compression Test: Holding steady thumb pressure on the tunnel for up to 60 seconds intentionally reproduces the patient's daily burning symptoms.
History and Mechanism
December 2035-Present
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History of Trauma or Injury: Up to 43% of TTS patients have a history of ankle injuries. Past ankle sprains, fractures, or heavy blunt force trauma can leave behind bone shifts, swelling, or permanent scar tissue that narrows the tunnel.
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Repetitive Stress and Career Demands: Jobs that require prolonged standing—such as teachers, factory workers, and retail staff—put continuous weight-bearing strain on the ankle.
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High-Impact Athletics: A history of high-impact activities like running, dancing, or jumping can cause repetitive tendon inflammation that crowds and pinches the nerve.
Results that matter
Nominations
Perineurium: Connective tissue wrapping around bundles of nerve fibers.
Demographics
The incidence of Morton neuroma isn't tracked, but it is generally regarded as a common condition. Women are diagnosed with Morton neuroma about five times more frequently than are men.
Etiology: What Happens?
The bones in the long part of the foot are the metatarsals, numbered 1 to 5 from medial to lateral. Their distal heads form the “ball” of the foot.
The common digital nerves supply sensation and motor control for the distal foot. Their branches converge between the superior aspects of the metatarsal heads. At this location, they can be squeezed from all sides when pressure is translated across the bottom of the foot and toward the toes, as during the “toe-off” phase of walking.
Several issues can contribute to nerve irritation in the ball of the foot. The nerve is embedded in thick fascia, the perineurium, all the way down the leg. If that fascia is tight and restrictive, it inhibits the ability of the nerve to function well, and increases the risk of entrapment or stretching of the nerve. Additionally, muscle tightness in the hamstrings or plantarflexors can pull on or compress the medial and lateral plantar nerves that eventually become the common digital nerves. People who spend a lot of their day in heels put pressure at the metatarsal heads, just where the nerves are compressed under the intermetatarsal ligaments.
Signs and Symptoms
The symptoms of tarsal tunnel syndrome can vary depending on exactly which branch of the tibial nerve is compressed. Most people experience a combination of the following signs:
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Sensation changes: Burning discomfort, a "pins-and-needles" tingling, or numbness.
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Pain distribution: Shooting or radiating pain that spreads from the inside of the ankle down to the arch, heel, sole, or toes.
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Activity patterns: Symptoms typically worsen during prolonged standing, walking, running, or exercise. They also frequently intensify at night.
Treatment
Management typically begins with conservative therapies aimed at reducing pressure and settling inflammation. To achieve this, healthcare providers often recommend the RICE method (rest, ice, compression, and elevation) to minimize active swelling around the ankle. Structural support is also highly effective; orthotics and braces, such as custom inserts, help lift the arch to prevent flat-foot pronation, while night splints work to keep the ankle in a neutral position. Additionally, physical therapy incorporates targeted calf stretching, tibialis posterior strengthening, and nerve-gliding exercises to restore healthy movement. When mechanical support isn't enough, medical interventions like nonsteroidal anti-inflammatory drugs (NSAIDs) can reduce overall inflammation and provide temporary pain relief, while corticosteroid injections can be delivered directly into the tunnel to control localized swelling around the nerve sheath. If these non-invasive measures provide insufficient relief after several months, surgical options may be discussed. In these cases, a procedure called tarsal tunnel decompression (or a tarsal tunnel release) is performed to cut the overlying flexor retinaculum ligament, which permanently opens up space and relieves pressure on the compressed nerve.
RESEARCH
One case report found that a client with Morton neuroma had less pain and more ability to exercise with massage.1 This is worthwhile in itself, but it is especially so because this client had not had success with other noninvasive therapies and was contemplating surgery.
OPTIONS
Work directly on the foot to create space between the affected metatarsals is helpful as long as symptoms are not made worse. This can be coupled with massage and stretching to the whole posterior aspect of the leg, where the source of the common digital nerves can be freed from fascial restrictions.
BENEFITS
Massage therapy appears to offer some benefits to clients with Morton neuroma, as is evedenced by the natural response to rub our tender feet when we are in pain. As long as symptoms are not exacerbated, most types of massage are safe, and some could be helpful in reducing the irritation both at the compression site in the foot and along the length of the sciatic nerve where the affected branches begin.
RISKS
Squeezing the metatarsal heads may elicit symptoms. Avoid this maneuver and most other types of massage are safe and appropriate for clients with Morton neuroma.
Timeline
Massage Therapy Implication
1. Davis F. Therapeutic massage provides pain relief to a client with Morton's neuroma: a case repot. International Journal of Therapeutic Massage and Bodywork 2012;5(2):12-19.
Therapeutic Massage Provides Pain Relief to a Client with Morton’s Neuroma: A Case Report - PMC