Müller-Weiss Disease

In summary: Müller-Weiss disease is a rare condition affecting the navicular bone that causes chronic pain and midfoot deformity. Recognising it is half the treatment: it is often managed with custom orthotics and, if surgery is necessary, a second opinion is worthwhile. In Martorell, Barcelona (Teknon) and Igualada.

Müller-Weiss disease is osteonecrosis of the navicular bone —a key component of the medial arch— in adults. The bone weakens and gradually collapses, which changes the shape of the foot and causes persistent pain. The navicular connects various bones of the ankle and midfoot and plays a role in load transmission when walking. If it becomes deformed, it can alter the alignment of the entire foot.

Why it is difficult to diagnose (and why it matters)

Many patients present after years of discomfort and mismatched diagnoses. This is normal: it is an uncommon condition and midfoot pain can be confused with tendinopathy, osteoarthritis, or simple “tired feet”. Diagnosis relies on suspecting the condition and accurately interpreting the radiology; when necessary, it is supplemented with CT or MRI scans.

The causes cannot always be identified. The shape and architecture of the foot, load distribution, certain bone development issues, or factors compromising its blood supply may all play a role. It is not necessarily an injury caused by a single trauma, although overloading or a direct impact can make the symptoms more evident.

The pain is usually located on the medial or central aspect of the midfoot and may arise when walking, standing, or during activities that require greater load-bearing. You may also experience stiffness, swelling, fatigue, difficulty walking on uneven surfaces, or a feeling that the foot has changed shape. The intensity does not always reflect the degree of deformity: this is why it is important to assess the symptoms and imaging together.

How it is diagnosed

During the consultation, we will ask when the pain started, how it progresses, and which activities trigger it. We will also observe the shape of your foot at rest and standing, your gait, joint mobility, and areas of tenderness. We will assess whether there is an associated deformity, how the load is distributed, and whether other structures, such as surrounding tendons or joints, are also affected.

X-rays, often weight-bearing, allow us to study the alignment, the shape of the navicular, and possible signs of collapse or osteoarthritis. Ultrasound can be useful for assessing tendons and soft tissues when required for the differential diagnosis. A CT scan provides a detailed view of the bone and joints; an MRI scan can provide information about the condition of the bone and surrounding tissues. It is not always necessary to perform all these tests.

Depending on the case, we may also conduct a gait analysis. This does not confirm the condition on its own, but it helps us understand how you bear weight on your foot and better guide offloading measures. The aim is to differentiate Müller-Weiss disease from other causes of pain and to define treatment according to the degree of deformity, mobility, and your needs.

What treatment options are available

Initial treatment is usually conservative. Custom orthotics can help distribute pressures better, stabilise the midfoot, and reduce the load on the navicular. They must be adapted to your anatomy and the way you walk. Reviewing your footwear, temporarily avoiding activities that aggravate the pain, and undertaking rehabilitation aimed at maintaining mobility and improving foot control can also be useful.

During painful phases, the practitioner may advise a reduction in weight-bearing or some form of immobilisation for a specific period. Decisions depend on the clinical examination, test results, and your progression. It is not advisable to endure pain for months without an assessment, nor to start treatments on your own without knowing exactly what the origin of the problem is.

If pain persists despite a well-planned conservative treatment, the deformity progresses, or there is significant osteoarthritis and functional limitation, surgery may be considered. There is no single suitable technique for everyone: the choice depends on the affected joints, foot alignment, bone condition, and the realistic expectations of each person. Surgery may involve correction procedures or the fusion of certain joints, depending on the case.

Surgery should not be the first response if there is still room to manage symptoms with conservative measures. Before deciding, it is important to understand the goal, what alternatives exist, the risks of the procedure, and what might happen if it is delayed. If someone has suggested surgery to you, a second opinion helps you decide with all the information.

Seek a consultation if you have persistent midfoot pain, if you notice that your medial arch or the shape of your foot has changed, or if you find it increasingly difficult to walk or stand. A specialist assessment allows us to confirm the diagnosis, rule out other problems, and choose the treatment most proportionate to your case.