What Is Madelung Deformity Causes Symptoms Treatment?

Madelung deformity is a rare condition of the wrist in which the radius bone on the thumb side of the forearm grows abnormally, causing the wrist to develop a visible deformity and sometimes causing pain or limited movement. It usually appears during childhood or the teen years, most often in girls, and it can occur on its own or as part of an underlying genetic condition. Mild cases may need only monitoring, while more serious cases are sometimes treated with surgery.

What Is Madelung Deformity?

Madelung deformity is a growth disturbance at the wrist. The forearm has two bones: the radius on the thumb side and the ulna on the pinky side. In this condition, the growth plate at the lower end of the radius — the part of the bone responsible for lengthwise growth in childhood — does not develop normally.

The result is a radius that is shorter and more curved than it should be. The ulna keeps growing, so it appears to stick out further. The small bones of the wrist shift out of their normal position, and the back of the wrist takes on a bumpy, prominent look.

It is named after Otto Madelung, the German surgeon who described the condition in the late 1800s. It is uncommon. It is not a form of arthritis, and it is not caused by injury to the wrist.

What Are the Causes of Madelung Deformity?

The root cause is abnormal growth of the lower radius during childhood. What triggers that abnormal growth falls into two broad groups: cases tied to a genetic syndrome and cases that occur without an identifiable syndrome.

The most recognized genetic link is a condition called Léri-Weill dyschondrosteosis, which is caused by changes in the SHOX gene. SHOX plays a role in bone growth and is also involved in height. People with SHOX-related conditions often have short stature along with the wrist changes. Madelung deformity can also appear in Turner syndrome and in a small number of other rare skeletal conditions.

In many people, no syndrome is found. The deformity appears on its own. In these cases the exact trigger is often not known.

Two features stand out in the numbers. Madelung deformity is reported far more often in females than males, and it usually shows up in adolescence, when the growth plates are active. It can affect one wrist or both, and when both are involved the changes are often not identical on each side.

What Are the Symptoms and Signs?

The most visible sign is the shape of the wrist and forearm. The lower forearm may look bowed, and the ulna may appear to protrude at the back of the wrist. The hand can sit at an angle rather than in a straight line with the arm.

Other common features include:

• Limited ability to bend the wrist backward (extension) and to rotate the palm fully upward (supination)
• Pain or aching, especially with pushing, lifting, or weight-bearing on the hand
• Reduced grip strength in some people
• A clicking or grinding sensation with wrist movement

An important point: the amount of visible deformity does not always match the amount of pain or loss of function. Some people have a noticeable wrist shape but little discomfort. Others have more pain than the appearance would suggest. This is one reason treatment decisions are based on symptoms and function, not on appearance alone.

Symptoms often become more noticeable during the adolescent growth spurt, because that is when the growth plate is most active and the deformity can progress.

How Is Madelung Deformity Diagnosed?

Diagnosis starts with a physical exam and is confirmed with imaging. A doctor will look at the wrist shape, check how far the wrist can move, and test grip.

X-rays are the main tool. On an X-ray, the lower radius appears short and tilted, the ulna appears relatively long, and the wrist bones sit in an abnormal position. These findings are fairly distinctive, which is why the condition can usually be identified from imaging.

Because the condition is sometimes linked to a genetic syndrome, a doctor may also check height, look for other skeletal features, and, in some cases, recommend genetic testing. Finding a SHOX-related cause can matter because it may affect other aspects of growth and health, not just the wrist.

It is worth separating two things. The X-ray changes are the deformity. The symptoms — pain, stiffness, weakness — are what the person actually feels. A person can have the X-ray findings without significant symptoms, and the reverse is also possible.

How Is Madelung Deformity Treated?

Treatment depends on age, symptoms, and how much the deformity is affecting daily life. There is no single approach that fits everyone.

Observation. For mild cases with little pain and good function, monitoring over time is often reasonable, especially if the growth plates are still open. The goal is to watch whether symptoms or the deformity progress.

Non-surgical care. Splinting, activity changes, and physical therapy are sometimes used to manage discomfort and maintain movement. These approaches may ease symptoms, but they do not correct the underlying bone deformity. Evidence that they change the long-term course is limited.

Surgery. When pain is significant or function is clearly limited, surgery may be considered. The general aim is to correct the alignment of the radius and address the relatively overgrown ulna. Several surgical techniques exist, and the choice depends on the person’s age, how much growth remains, and the specific pattern of the deformity. Surgery is generally reserved for cases where symptoms are meaningful, because it carries its own risks, including stiffness, incomplete correction, and the possibility of further procedures.

A key point about timing: in children who are still growing, surgery can be complicated by the fact that the bones will keep changing. This is why the decision to operate, and when, is often made with a specialist such as a hand or pediatric orthopedic surgeon. Outcomes vary from person to person, and no single operation reliably restores a fully normal wrist.

What Is the Outlook?

Madelung deformity is generally not a dangerous condition, and it does not spread to other joints. The main concerns are pain, reduced wrist motion, and grip strength over time.

How much it affects a person varies widely. Some people live with mild changes and few problems. Others have ongoing pain or functional limits that affect work, sports, or daily tasks. Because the condition involves abnormal growth, symptoms often stabilize once the growth plates close in adulthood, though existing joint changes remain.

If the deformity is part of a genetic syndrome like a SHOX-related condition, other features — such as short stature — may also be part of the picture. That is one reason a full evaluation can be useful, not just a look at the wrist.

When Should You See a Doctor?

See a doctor if you or your child has a wrist that looks bowed or angled, a bump at the back of the wrist, or pain and stiffness that limit normal use. These signs deserve an evaluation, particularly during childhood and adolescence when growth is active.

An early assessment can help clarify whether the changes are isolated or part of a broader condition, and it gives you time to discuss options before symptoms progress. There is no emergency here in most cases, but a wrist that is changing shape or losing function is not something to ignore.