Diagnostic ultrasound has become one of the most valuable imaging tools for assessing chronic heel pain because it allows the plantar fascia and surrounding soft tissues to be examined in real time. Unlike static imaging, ultrasound enables the clinician to assess tissue structure while correlating the findings with the patient's symptoms during the consultation.
For patients with suspected plantar fasciosis, ultrasound can demonstrate changes such as increased plantar fascia thickness, loss of the normal fibrillar pattern, areas of degeneration, partial tearing and changes at the attachment to the heel bone. It can also identify fluid collections, bursae and other soft-tissue abnormalities that may contribute to heel pain.
Ultrasound is also helpful when considering conditions other than plantar fasciosis. It may demonstrate features that suggest Baxter's nerve irritation indirectly, evaluate surrounding muscles and tendons, identify plantar fascia tears and assess the heel fat pad. Although ultrasound cannot diagnose every cause of heel pain, it provides valuable information when interpreted alongside the patient's history and examination.
One of the greatest advantages of ultrasound is that it is dynamic. During the examination, the painful area can be assessed while the patient describes their symptoms. Structures can be compared with the opposite foot and gentle pressure can be applied to determine whether imaging findings correspond with the site of pain. This clinical correlation is one reason ultrasound is particularly useful in experienced hands.
It is equally important to understand what ultrasound cannot do. Imaging abnormalities do not always explain a patient's symptoms. Some people have thickened plantar fascia with little pain, while others experience significant symptoms despite relatively modest structural changes. For this reason, ultrasound should support clinical reasoning rather than replace it.
Diagnostic ultrasound also plays an important role in treatment. It allows procedures such as prolotherapy, platelet-rich plasma (PRP) injections and hydrodissection to be performed under direct visual guidance, improving the accuracy of needle placement while avoiding nearby nerves, blood vessels and other important structures.