Final answer:
The most frequent complication after syndactyly repair is web creep, which is the postoperative merging of the separated fingers due to scar contracture or incomplete initial procedure. Proper aftercare can reduce the risk of this and other complications like infection and reduced mobility.
Step-by-step explanation:
The most frequent complication following syndactyly repair is web creep, which is the gradual return of the fingers to a webbed or joined state postoperatively. This can occur due to scar contracture or incomplete separation during the initial surgery. Proper postoperative care, including physiotherapy and the use of splints, can help in minimizing this complication. Other potential complications can include infection, skin graft failure, and decreased range of motion of the affected fingers.