Syndactyly (Joined fingers)

About Syndactyly (Joined fingers)

Syndactyly, a congenital hand deformity where two or more fingers are fused, occurs in about 1 in 2,000 live births and is one of the most common hand differences seen in children. Boys are affected more often than girls. Although the fingers are most commonly involved, toes can also fuse. The condition develops during fetal life when programmed cell death between digits is incomplete, leaving the fingers joined.

There is a clear genetic component; 10 to 40 percent of affected children inherit the trait from a parent, while others present sporadically. The fingers most commonly fused, in decreasing order, are the long-ring web, ring-little web, index-long web, and finally thumb-index. Some children also have associated anomalies, which we screen for at Kayakriti before any pediatric hand surgery is planned.

Diagnosis is made at birth and can sometimes be picked up on a level 2 prenatal ultrasound. X-rays show whether bone is fused. Syndactyly is classified into simple (skin and soft tissue only), complex (skin, soft tissue, and underlying bone), and complicated (with abnormal bone and ligament development). Each type changes the operative plan and the expected outcome significantly.

Surgery is the only definitive treatment. The aim is to create a stable, deep web space, separate the fingertips cleanly, and resurface the sides of the fingers. We use zigzag skin plasty for the lateral defects and full-thickness skin grafts where coverage is insufficient. Microsurgical technique protects each digital nerve and vessel. Timing and staging depend on which webs are involved and whether border digits share blood supply.

What to expect

• Examination of every web, plus X-rays for bone or nail involvement.
• Honest classification: simple, complex, or complicated syndactyly.
• Staged surgery when both sides of a finger are joined to neighbours.
• Zigzag plasty and full-thickness skin grafts for durable, supple webs.
• Splinting and structured therapy planned before the child leaves hospital.

Recovery

• Splints typically stay on for 3-4 weeks after each surgery.
• Light hand use resumes once dressings and splints come off.
• Night splinting often continues for several months to keep webs deep.
• Most children resume normal play and school within 6-8 weeks.