Dupuytren's Contracture

Dupuytren's contracture is a **fibroproliferative disorder** of the **palmar fascia** — the tough sheet of connective tissue beneath the skin of the palm. In this condition, the normally thin, flexible palmar fascia thickens, shortens, and forms cords that gradually pull the fingers into a permanently bent position. **The anatomy:** The palmar fascia is a fibrous layer deep to the skin that helps with grip. It has longitudinal bands extending from the palm toward each finger. In Dupuytren's disease, abnormal **myofibroblasts** (cells with properties of both fibroblasts and smooth muscle cells) proliferate within this fascia, producing excessive collagen and contracting — similar to the process of wound healing, but without an actual wound. **The progression happens in three stages:** **1. Proliferative phase (nodules):** - Myofibroblasts accumulate, forming **firm nodules** in the palm - Nodules are often tender at this stage - No finger contracture yet — this is the earliest sign **2. Involutional phase (cords):** - Myofibroblasts align along the longitudinal axis of the fascia and contract - Dense **cords** form from the palm toward the fingers - The cords begin to pull the fingers into flexion (bending) **3. Residual phase (contracture):** - Mature, relatively acellular collagen cords replace the myofibroblasts - The cords are fixed — the fingers are permanently bent - Joint capsule and ligament shortening develops secondary to the prolonged flexion **Why is it called "Viking disease"?** The condition is highly concentrated in populations of Northern European and Scandinavian descent, leading to the popular theory that Viking traders and invaders spread the genetic predisposition across Northern Europe, Britain, and their colonies. Prevalence maps closely follow historical Viking settlement patterns. **The key distinction from [trigger finger](/condition/trigger-finger):** In [trigger finger](/condition/trigger-finger), the finger gets stuck because the flexor tendon catches on a thickened pulley (tendon sheath). In Dupuytren's, the finger is pulled into flexion by a contracted cord of palmar fascia. Trigger finger causes catching and locking (the finger pops); Dupuytren's causes a FIXED bend that cannot be straightened.

The exact cause of Dupuytren's contracture remains incompletely understood, but it involves a complex interplay of genetics, biology, and environmental factors: **Genetic factors (strongest contributor):** - **60-70% of patients** have a positive family history - The inheritance pattern is autosomal dominant with variable penetrance - Multiple genetic loci have been identified, particularly genes involved in the **WNT signaling pathway** (important for cell growth and differentiation) and **TGF-β pathway** (a master regulator of fibrosis) - Genome-wide association studies have identified **26+ genetic risk loci** - First-degree relatives have a **3-5 fold increased risk** **The cellular mechanism:** 1. An initiating event (microtrauma, ischemia, or unknown trigger) activates fibroblasts in the palmar fascia 2. Fibroblasts differentiate into **myofibroblasts** — cells that produce collagen AND have contractile properties (like smooth muscle) 3. Myofibroblasts produce excessive **type III collagen** (instead of the normal type I), which is less organized and more prone to contraction 4. The myofibroblasts actively CONTRACT, shortening the fascia 5. Over time, the cellular tissue is replaced by dense collagen cords — but the contracture persists because the shortened tissue has remodeled **Risk factors and their mechanisms:** - **Diabetes**: Affects **5-42%** of diabetics. The mechanism involves advanced glycation end-products (AGEs) cross-linking collagen and microvascular damage. Diabetic Dupuytren's tends to be bilateral but milder, with less severe contractures - **Smoking**: Microvascular damage creates local ischemia in the palmar fascia, triggering the fibroblast-to-myofibroblast transition - **Alcohol**: May act through liver dysfunction and altered growth factor metabolism - **Manual labor/vibration**: Controversial — may cause microtrauma that activates the disease in genetically predisposed individuals, but large studies have not consistently confirmed this association **Why the ring and little fingers?** The ulnar (pinky) side of the hand has the thickest palmar fascia and the most prominent longitudinal bands. The ring and little fingers are also subject to the most mechanical stress during power grip. This combination of thicker fascia + more mechanical stress + the anatomic arrangement of the fascial bands explains the ulnar predominance.

**Observation (for early/mild disease):** - If there is no functional limitation and the contracture is <20°, watchful waiting is appropriate - Monitor every 6-12 months for progression - No proven treatment can PREVENT progression (radiation therapy in very early disease is under investigation in Europe) **Interventional treatments (when function is affected):** **1. Needle aponeurotomy (percutaneous needle fasciotomy):** - A needle is used to puncture and weaken the cord percutaneously (through the skin) - **Office procedure** under local anesthesia — takes 15-30 minutes - **Recovery**: 1-2 days; rapid return to activities - **Success rate**: Immediate contracture reduction in **90-95%** of MCP joint contractures - **Recurrence rate**: **50-65%** within 3-5 years — the highest of all treatments - **Best for**: Elderly patients, patients who need quick recovery, well-defined cords at the MCP joint - **Advantage**: Can be repeated easily and indefinitely **2. Collagenase injection (Xiaflex — clostridial collagenase histolyticum):** - An enzyme (collagenase) is injected directly into the cord, which dissolves the collagen - The next day, the finger is manipulated to rupture the weakened cord - **Office procedure** — injection day 1, manipulation day 2 - **Success rate**: **64-76%** achieve full correction (depends on joint involved) - **Recurrence rate**: **35-50%** at 5 years - **Side effects**: Significant swelling, bruising, and skin tears (10-15%); rare tendon rupture (<1%) - **Note**: Xiaflex was temporarily off the market but has returned; availability varies by region **3. Open surgical fasciectomy (limited or extensive):** - Surgical removal of the diseased fascia through an open incision - The gold standard for **severe or recurrent disease** - **Recovery**: 4-12 weeks of hand therapy; wound healing takes 2-4 weeks - **Success rate**: Highest immediate correction rates — **90-97%** at MCP joint; **80-85%** at PIP joint - **Recurrence rate**: **20-35%** at 5 years — the lowest recurrence of all treatments - **Best for**: Young patients with diathesis, severe contractures, PIP joint involvement - **Complications**: Nerve damage (2-5%), wound healing problems, stiffness **4. Dermofasciectomy (for severe recurrence):** - Removal of diseased fascia PLUS the overlying skin, replaced with a skin graft - **Lowest recurrence rate**: **10-15%** at 5 years - **Reserved for**: Recurrent disease after previous surgery; severe diathesis **Post-treatment rehabilitation:** - **Hand therapy is essential** after all treatments - Splinting in extension: typically worn at night for **3-6 months** - Range of motion exercises: started within 1-2 days - Scar management: silicone sheets, massage, and compression