One of the most consistent findings in the literature is that accurate diagnosis is critical. Tarsal tunnel syndrome is frequently overdiagnosed in patients with burning heel pain and underdiagnosed in those with atypical symptoms. Research has repeatedly shown that many patients labelled with tarsal tunnel syndrome are ultimately found to have plantar fasciosis, Baxter's nerve entrapment, lumbar radiculopathy or peripheral neuropathy instead. Equally, some patients undergo prolonged treatment for plantar fasciitis before nerve compression is eventually recognised.
Clinical examination remains the foundation of diagnosis. While Tinel's sign, sensory changes and neurological symptoms are useful findings, no individual examination test has consistently demonstrated high diagnostic accuracy. For this reason, clinicians are encouraged to interpret examination findings alongside the patient's history and imaging rather than relying on any single clinical test.
Research has increasingly highlighted the value of diagnostic ultrasound. High-resolution ultrasound can identify enlargement of the posterior tibial nerve, ganglion cysts, varicose veins, tendon pathology and other structures contributing to nerve compression. It also provides the advantage of dynamic assessment, allowing the nerve to be visualised during movement while simultaneously examining adjacent tendons and the plantar fascia.
MRI also plays an important role. Although MRI does not diagnose nerve compression directly, it is highly effective at identifying the structural abnormalities responsible for narrowing the tarsal tunnel. Ganglion cysts, accessory muscles, tendon inflammation, scar tissue and other space-occupying lesions are often demonstrated more clearly on MRI than on clinical examination alone.
Nerve conduction studies have traditionally been regarded as part of the diagnostic work-up, but the evidence surrounding their usefulness is mixed. Studies have shown that patients with clinically significant tarsal tunnel syndrome may have entirely normal nerve conduction results, particularly during the early stages of compression. Conversely, abnormal nerve conduction studies do not always correlate with the severity of symptoms. Current evidence therefore suggests that these tests should complement, rather than replace, careful clinical assessment.
The evidence supporting conservative treatment is generally favourable, although relatively limited. Activity modification, footwear optimisation, orthotic therapy where biomechanically indicated and rehabilitation are widely recommended because they address the underlying mechanical contributors to nerve compression while carrying very little risk. Most patients with mild to moderate symptoms improve without requiring surgery.
Research regarding ultrasound-guided injections is less extensive. Small observational studies suggest that carefully placed injections may reduce inflammation around the nerve and, in some cases, help confirm the diagnosis by temporarily relieving symptoms. However, the current evidence is insufficient to recommend routine injections for every patient, and they should be reserved for carefully selected cases.
Surgical decompression has demonstrated encouraging outcomes in many published case series, particularly when a clearly identifiable compressive lesion is present or when conservative management has failed. Patients with a shorter duration of symptoms, a well-defined diagnosis and a positive clinical examination generally experience the best outcomes. However, because most published surgical studies are retrospective and involve relatively small patient numbers, the quality of evidence remains moderate rather than high.
Perhaps the most important message emerging from the research is that tarsal tunnel syndrome is not a single disease with one universal treatment. Successful management depends on identifying the specific cause of nerve compression. A patient with a ganglion cyst requires different treatment from someone with flat feet, inflammatory tenosynovitis or postoperative scar tissue. This explains why outcomes vary considerably between individuals.
Current evidence therefore supports an individualised approach based on careful diagnosis, targeted treatment and correction of the underlying cause of nerve compression. Simply treating symptoms without understanding why the nerve is irritated is less likely to produce long-term success.