Accurately diagnosing plantar fasciosis involves much more than confirming that the heel is painful. Although the condition is common, several other disorders can produce similar symptoms, and more than one condition may be present at the same time. A comprehensive assessment is therefore essential before deciding on the most appropriate treatment.
The diagnostic process begins with a detailed history. Understanding when the pain started, where it is located, whether it is worse with the first steps in the morning, how it behaves during the day, previous injuries, occupation, sporting activities and treatments already attempted provides valuable information. The pattern of symptoms often offers important clues that cannot be identified on imaging alone.
A thorough physical examination follows. This includes identifying the exact site of tenderness, assessing calf flexibility, foot posture, joint movement, muscle strength, gait and the function of the plantar fascia and surrounding structures. The examination also helps identify signs suggesting Baxter's nerve entrapment, heel fat pad syndrome, stress injury or inflammatory arthritis.
Diagnostic ultrasound is one of the most useful investigations for plantar fasciosis because it allows the plantar fascia to be examined in real time. Ultrasound can demonstrate thickening of the fascia, altered fibre pattern, degenerative change, partial tearing and other abnormalities. The findings are interpreted alongside the patient's symptoms rather than viewed in isolation.
MRI is not required for every patient, but it provides valuable additional information when deeper pathology is suspected or the diagnosis remains uncertain. MRI can identify bone marrow oedema, stress fractures, muscle pathology and other conditions that may not be visible on ultrasound. It complements rather than replaces a careful clinical assessment.
The objective of diagnosis is not simply to confirm plantar fasciosis. It is to understand why the condition developed, why healing has failed and which factors must be addressed to achieve lasting improvement.