Comprehensive Guide to Dupuytren's Contracture: Etiology, Surgical Anatomy & Indications
Key Takeaway
Dupuytren's contracture is a progressive fibroproliferative disorder causing fixed flexion deformities in the hand, primarily affecting MCP and PIP joints. Etiology is multifactorial, including genetics and age. Surgical intervention is indicated based on functional impairment, degree of contracture, and progression, aiming to restore hand function.
A 58-year-old male presents with a progressive flexion deformity of his little finger. He reports difficulty washing his face and wearing gloves. On examination, you observe a palpable cord extending into the proximal phalanx, causing a 40-degree fixed flexion deformity at the MCP joint and a 20-degree deformity at the PIP joint. The "Tabletop Test" is positive.
How do you classify this patient’s presentation in terms of anatomical cords, and what is your specific concern regarding the neurovascular bundle during surgery?
Candidate: The patient has a pretendinous cord causing the MCP contracture and likely a spiral cord contributing to the PIP contracture. My main concern is the neurovascular bundle, as the spiral cord displaces it superficially and ulnarly in the small finger, putting it at high risk of injury during excision.
Failing to mention the specific components of the spiral cord (pretendinous band, spiral band, lateral digital sheath, and Grayson's ligament) or incorrectly identifying the direction of bundle displacement (e.g., claiming it moves radially in the little finger).
The patient exhibits a spiral cord, the most dangerous anatomical configuration for surgical dissection. This cord is formed by the contraction of the pretendinous band, spiral band, lateral digital sheath, and Grayson's ligament. In the little finger, the spiral cord displaces the neurovascular bundle superficially and ulnarly. I would ensure dissection begins in the proximal palm or distal digit where the anatomy is normal, tracing the bundle proximally to avoid iatrogenic injury.
You decide to proceed with a regional fasciectomy. During your pre-operative planning, you discuss the risk of recurrence and complications. The patient asks specifically about the risk of "stiffness" post-operatively. How do you address this, and what surgical strategies can mitigate this risk?
Candidate: Stiffness is a common complication. I would manage this by encouraging early active motion, using night extension splinting, and ensuring the surgeon does not over-dissect or damage the subcutaneous fat, which could lead to hematoma or scar tissue formation.
Ignoring the "joint-related" causes of stiffness. A failing candidate often ignores the fact that chronic PIP joint contractures involve fixed changes in the volar plate and collateral ligaments, not just the cord itself.
Stiffness is multifactorial: skin tension, hematoma-induced fibrosis, and intrinsic joint changes. To mitigate: 1. Surgical: Use Bruner zig-zag incisions to avoid linear scars; if skin tension is high, use a McCash open-palm technique or skin graft. 2. Intraoperative: Avoid aggressive collateral ligament release unless absolutely necessary. 3. Rehabilitation: Immediate supervised mobilization is mandatory. 4. Expectation Management: I would clarify that the PIP joint, being a uniaxial hinge joint, often has a more guarded prognosis for full extension than the MCP joint due to secondary capsular shortening.
