Suddenly, your child is limping, suddenly complains of foot pain after a day at school, or refuses to bear weight… And there’s no trauma to explain the limp. That’s a parent’s nightmare, but there’s a condition that can cause exactly that picture and not be all that rare: Kohlers Disease of the navicular.

Here’s what it actually is, how to recognize it, how physicians make the diagnosis, what causes it, and how kids are usually managed. The best part?

The patient outcomes are very good.

Understanding Kohlers Disease of the Navicular

What is Kohler’s Disease?

A Rare Pediatric Bone Disorder that Affects the Navicular KOHLER’S DISEASE AFFECTS the navicular – the small, boat-shaped bone on the medial side of the midfoot. It actually serves an important function as it is a keystone in the arch of the foot, and if it’s affected, it is uncomfortable to walk and disturbs the normal foot mechanics. Here’s what’s going on inside that bone to cause the problem.

Definition and Cause

Kohler’s disease is a form of osteochondrosis, a general term for temporary interruption of blood flow to an immature bone. In the absence of blood flow, the navicular has a case of avascular necrosis, and the bone substance begins to deteriorate because it isn’t getting the oxygen and nutrients required to survive. Thankfully, children’s bodies are excellent at repairing themselves when subjected to this sort of insult.

Once the blood flow begins again, the avascular necrosis is resolved, and the bone rebuilds itself.

Who Gets It

If you have a very active child or children who spend most of their time on their feet then they are more likely to feel the symptoms while they are even more mechanically loaded by weight bearing stresses.

Symptoms and Early Signs

Even before a formal diagnosis is made, parents can tell that something is different with their child. Perhaps the child has a limp when walking or refuses to put weight on one foot when walking. Or the child might complain of pain in a very specific area.

These early signs are important to recognize, as the sooner the condition is diagnosed, the sooner you can start to manage and help it.

Foot Pain and Limping

Pain in the midinner of the foot, over the navicular bone. Most children complain of it as an ache that gets worse with activity and better with rest.

Nearly always you will be able to press on the navicular bone in the centre of the foot and that will be tender. Midfoot swelling is common. Affected children may walk with a limp, and younger children may be reluctant to walk or ask to be carried more than normal.

The pain is not severe or crippling but it is persistent and affects the way the child walks.

Visible Changes and Activity Limitations

Other clues to give you a hint towards diagnosis: You may see little to no redness or warmth at the navicular bone. This is not always there, but easy to miss. The test that really indicates diagnosis – children will walk on the edge of their foot – they shift their weight away from the pain and this may lead to later problems with their ankles or knees if it persists for months.

It is noticeable because they are limping and avoid activity – running, jumping and long walks for example – cause pain.

How It Is Diagnosed

Making the diagnosis involves excluding other potential causes of midfoot pain such as fracture, infection and inflammatory disease. Once the diagnosis is suspected, it is fairly simple to make a confident diagnosis using a combination of clinical examination and imaging.

Physical Exam and History

History is the key. The doctor will want to know when pain started, was there an injury, does it hinder walking, and does rest help. On examination, tenderness directly over the navicular is a significant feature.

The doctor will also watch how your child walks, noting if they have the well-known weight-shifting style. Because Kohler’s disease has no laboratory test to confirm its presence, diagnosis hinges on clinical findings and X-ray pictures.

X-Rays and Imaging Findings

The initial imaging investigation will be plain X-rays. With Kohler’s disease, the navicular bone will look more dense (sclerotic), flattened and fragmented, similar to how it looks on the opposite side but more compressed, and misshapen. This combined with the child’s age, level of pain and whether they have other pain or symptoms around the foot, is normally enough to confirm the diagnosis.

An MRI scan is sometimes ordered where the X-ray features are less clear and there’s a clinical question over the marrow changes seen, but not normally needed.

Causes, Risk Factors, and Prognosis

What causes Kohler’s disease isn’t known for sure, but various overlapping theories of navicular etiology in childhood have been proposed.

Possible Mechanisms

The navicular turns into bone – a process called ossification – after many other bones in the foot, and so it’s weaker at a stage of development when it’s likely to be subject to repeated crushing forces when walking and running. Its blood supply is far from secure and strong, and some have highlighted delayed ossification as the key risk factor while others maintain that low and erratic blood circulation makes the navicular uniquely exposed and vulnerable.

Recovery and Long-Term Outlook

The outlook is really good. The majority of kids will be back to normal in 2-3 years and the navicular will be normal shape and density on follow-up Xrays. Long term studies demonstrate no significant increase in arthritis or other functional problems as an adult, so that is good news for parents to hear.

Treating Kohlers Disease of the Navicular

While management aims to decrease pain and protect the foot during the natural healing process of the bone, there is no available treatment that increases the speed of this healing process. The aim is to maintain function and comfort of the child.

Rest, Support, and Pain Relief

Medical Treatment of Navicular Stress Fractures Nonsteroidal anti-inflammatory medication, such as ibuprofen, can help with pain and swelling. Activity modification – Limit high-impact activities as tolerated until symptoms resolve. Proper footwear -Supportive footwear with good arch support or orthotic devices can reduce the pressure on the navicular and significantly improve walking comfort.

Cast – A short-leg walking cast for 6-8 weeks (immobilization) will give the bone a period of rest and can diminish pain and improve the ability to walk.

When Medical Evaluation Matters

They require rest with elevation for at least two weeks. If, however, the child refuses to walk, can’t put weight on the foot at all, has marked swelling or the pain persists despite initial rest and analgesia then a parent should arrange review with a doctor. A straightforward midfoot sprain can be diagnosed and managed easily in the short term by the pediatrician or a pediatric orthopedic surgeon and parents sleep better.