What causes dupuytren's contracture

Overview

Dupuytren's contracture is a condition that affects the fascia, a thick layer of connective tissue found beneath the skin in the palm of the hand. This condition causes the fascia to thicken and shorten, forming bands or cords that can pull one or more fingers inward towards the palm. This progressive tightening can make it difficult or impossible to straighten the affected finger(s), impacting daily activities.

What is Dupuytren's Contracture?

In Dupuytren's contracture, the palmar fascia, which is normally a thin, pliable sheet of tissue, begins to thicken and form nodules (lumps) and cords. These cords can extend from the palm up into the fingers. As these cords tighten, they gradually pull the fingers, most commonly the ring and little fingers, into a bent or contracted position. While it usually affects both hands, it may be more severe on one side.

What Causes Dupuytren's Contracture?

The precise cause of Dupuytren's contracture remains unknown, but it is widely considered to be a genetic disorder. Research suggests a strong hereditary component, meaning it often runs in families. Individuals with Northern European ancestry have a significantly higher prevalence of this condition. While the genetic predisposition is clear, the exact genetic mechanism is still being investigated.

Genetic Factors

Several genes have been implicated in the development of Dupuytren's contracture, suggesting a complex genetic inheritance pattern. The condition is much more common in people of Northern European descent (e.g., English, Scottish, Irish, French, Dutch). It is estimated that up to 15% of individuals in these populations may develop the condition to some degree.

Age and Sex

Dupuytren's contracture typically affects individuals over the age of 50. It is also more common in men than in women, although women can also develop the condition. Men often experience more severe symptoms and earlier onset.

Other Potential Risk Factors

While not considered a direct cause, certain factors are associated with an increased risk or earlier onset of Dupuytren's contracture:

• Diabetes Mellitus: Some studies suggest a higher incidence in individuals with diabetes, though the link is not fully understood.
• Epilepsy: A correlation has been observed, but the exact relationship is unclear.
• Smoking and Alcohol Consumption: Excessive smoking and alcohol use have been linked to an increased risk, possibly due to their effects on connective tissue and circulation.
• Certain Medications: Some medications, such as those used to treat epilepsy (e.g., phenytoin), have been associated with Dupuytren's contracture.

It is important to note that Dupuytren's contracture is generally NOT caused by injury or overuse of the hand. While an injury might draw attention to an existing condition, it does not cause it. The disease process is believed to originate within the palmar fascia itself, driven by underlying genetic and possibly environmental factors.

Progression of the Condition

Dupuytren's contracture is a progressive condition, meaning it typically worsens over time. The rate of progression varies significantly among individuals. In some people, it may progress slowly over many years, while in others, it can advance more rapidly. The condition usually starts with the formation of nodules in the palm, which may be tender. Over time, these nodules can develop into cords that pull the fingers into a bent position. The range of motion in the affected finger(s) diminishes, making it increasingly difficult to perform everyday tasks like shaking hands, typing, or playing musical instruments.

Diagnosis and Treatment

Diagnosis is usually made through a physical examination of the hand. There is no cure for Dupuytren's contracture, but various treatments can help manage symptoms and improve hand function. These include:

• Observation: For mild cases with no functional impairment, regular observation may be recommended.
• Needle Aponeurotomy: A minimally invasive procedure to break up the cords.
• Enzyme Injections (e.g., Xiaflex): Injections of an enzyme to break down the cords.
• Surgery: Removal of the affected fascia is the most common surgical treatment for severe contractures.

The decision for treatment depends on the severity of the contracture, the impact on daily function, and the patient's overall health.