Title : Right index finger pollicization for traumatic amputation at metaphyseal base of thumb metacarpal
Abstract:
Background: The thumb plays a crucial role in hand function, contributing to more than half of the hand's capabilities. Its specialized anatomical features/structures are essential for intricate manipulations and powerful pinching actions. Traumatic thumb amputations significantly impair hand function, necessitating advanced surgical techniques to restore it. Index finger pollicization has emerged as an effective method to recreate the thumb's functionality. This procedure has evolved over decades, integrating refined techniques that enhance functional and aesthetic outcomes. In this case report, we present a complex right index finger pollicization procedure to address a traumatic amputation of the thumb. This report provides a comprehensive guide to the technique and provides educational operative pearls at every step.
Description: The procedure involves designing a flap to reconstruct the first web space and repositioning the index finger to serve as the thumb. Dissection begins with careful identification and preservation of neurovascular structures to avoid compromising blood flow or sensation. The metacarpophalangeal (MCP) joint is stabilized with suture anchors to prevent hyperextension. The dorsal flap is elevated, and osteotomy of the index finger metacarpal is performed to achieve the proper height and positioning of the reconstructed thumb. The index finger metacarpal is fixed to the residual first metacarpal of the thumb using a double-row plate and K wires. The dorsal flap is folded into the first web space to recreate the web contour, and the extensor tendon is imbricated for esthetic and functional alignment. Postoperative therapy is critical to ensure a functional and aesthetic outcome.
Alternatives:
•Surgical: Toe-to-hand transfer, free tissue transfer with tendon reconstruction, or prosthetic thumb reconstruction
•Nonsurgical: Orthotic devices to assist with grip and pinch function.
Rationale: Pollicization of the index finger differs from alternative treatments in its ability to provide an anatomically integrated and functional thumb reconstruction without requiring additional donor sites3. This technique optimizes both esthetic and functional outcomes by creating a thumb capable of performing grasp and pinch activities. Compared to prosthetic options, this approach offers a more durable, long-term solution and restores a natural appearance, which is crucial for patient satisfaction.
Expected Outcomes: Patients undergoing index finger pollicization can expect restored pinch and grasp functionality, significant improvement in hand aesthetics, and a reconstructed first web space. Literature indicates that well-executed pollicization results in high rates of patient satisfaction, with restored hand function and esthetic acceptance. Outcomes depend on proper positioning and tensioning during the procedure, as well as diligent postoperative therapy to maximize range of motion and strength.
Important Tips
•Carefully plan the flap to ensure optimal reconstruction of the first web space.
•Preserve neurovascular structures to maintain blood flow and sensation.
•Stabilize the MP joint with suture anchors to prevent hyperextension.
•Ensure proper positioning and height of the reconstructed thumb for optimal esthetics and function.
•Imbricate the extensor tendon for alignment but avoid shortening the flexor tendon unnecessarily.
•Use a double-row plate and K wires for stable fixation of the metacarpal.
•Start postoperative therapy early to enhance outcomes and ensure proper healing.
