This covers the treatment of the differences a hand can be born with: joined fingers, extra fingers, absent fingers or thumbs that do not work as they should.
The first thing discussed with parents is not the technique but the goal, because there is usually a misunderstanding. The aim of this surgery is for the hand to work: to grip, pinch, hold and explore. It is not to achieve a normal-looking hand, and chasing that leads to unnecessary operations. Many children with different hands develop excellent function with adaptations of their own that are often surprising, and part of the work consists of telling what needs operating on from what does not.
The second thing explained is the timetable, because the urgency parents feel does not always match the real one. Some differences are operated on early — a syndactyly between fingers of very different length is released before the first birthday, because the longer finger bends off course as it grows — while others wait until the child is bigger and the structures easier to handle. A small extra finger with no bone can be dealt with very early; a thumb reconstruction is planned with more time.
It usually helps when there is
- Fingers joined to each other, wholly or partly.
- An extra finger or fingers.
- An absent, underdeveloped or poorly functioning thumb.
- Congenital constriction bands compressing a finger.
- Congenital stiffness or deviation that compromises function.
Worth discussing first if
- A difference that does not limit function: it may need no surgery.
- An age still too early for the technique indicated.
- A difference associated with a syndrome that needs investigating first.
- Expecting a normal-looking hand, which is not the goal.
- The need for rehabilitation afterwards and the family's availability.
None of these rules the procedure out on its own; all of them change the conversation.
What type of difference it is
Each has its own timing and technique.
Syndactyly
Joined fingers. They are separated with flaps of the child's own skin and almost always a graft. It is operated earlier if the joined fingers are of very different length.
Polydactyly
Extra fingers. The less functional one is removed while reconstructing ligaments and alignment, not simply cut off: that leaves long-term deviation.
Thumb differences
The thumb provides a large part of the hand's function. It is reconstructed, stabilised or, if it is missing, can be built from the index finger.
Function first, and the right moment
The indication rests on what the difference prevents the child doing, not on how it looks. Before operating, how the child uses the hand, which grips they manage and what adaptations they have developed are all observed. Operating on something the child already compensates for well can make their function worse, and that assessment takes more than one consultation.
The timing is chosen by development, not by anxiety. There are situations that do not wait: a syndactyly between fingers of different length is released before the first birthday because growth progressively bends the longer finger off course, and a constriction band compromising the circulation is treated immediately. Others benefit from waiting until the structures are larger and the anaesthetic safer.
In syndactyly there is a principle that avoids the most frequent long-term problem: never release both sides of the same finger in one operation, because its blood supply would be compromised. And the web between the fingers is reconstructed with a skin flap, not a graft, because a graft in that area contracts and the join reappears over the years.
What the process is like
There is frequently more than one operation over childhood.
Consultation and observation
The hand and how the child uses it are assessed, X-rays studied and associated differences ruled out. What to operate on and what not is established.
Plan by age
What must be done early for developmental reasons and what should wait are set out. The foreseeable timetable is explained to the family.
Surgery
Under general anaesthesia, with whichever technique applies. Afterwards, immobilisation with a dressing or protective cast for some weeks.
Follow-up through growth
Periodic reviews through childhood: growth can produce deviation or contracture that needs adjusting later.
What to expect
Children recover faster than parents expect.
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Weeks 1 to 3
A dressing or protective cast going above the elbow in the smallest children, so they cannot pull it off. Less discomfort than anticipated.
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Weeks 4 to 8
Once the immobilisation is off, the child goes back to using the hand spontaneously. Dressings and moisturising of the scars.
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Months 3 to 12
The scars mature. Contracture of the web between the fingers is watched for, as it is the point most closely monitored.
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Through growth
Periodic reviews until the end of development, because growth may call for later adjustments.
Risks, and what is not promised
Those of each technique: partial loss of the graft, infection, loss of a flap, stiffness and scars that may contract. The specific and most frequent long-term problem is the join between the fingers reappearing through contracture of the scar, which may need further surgery years later.
Growth introduces a factor particular to children's surgery: a correct result at two years old can deviate by ten, which is why follow-up continues until the end of development. It is foreseeable and does not mean the first operation was done badly.
A normal-looking hand is not promised: what is sought is a hand that works well, and that is a different and achievable goal in most cases. Scars remain and so do differences in shape. These risks are reduced by a suitable technique, the right surgical timing and follow-up through growth. They are not eliminated. The ones that apply to your child's case are set down in writing in the informed consent.
The information on this page is for guidance and does not replace an in-person medical consultation. Medical practice is an obligation of means, not of result.
The questions parents ask most
It depends on the type. A syndactyly between fingers of very different length is released before the first birthday, because otherwise the longer finger bends off course as it grows. Others wait until the child is older and the structures easier to handle.
The urgency parents feel does not always match the real one, and part of the consultation is explaining that timetable calmly.
The goal is for the hand to work: to grip, pinch and hold. It is not to achieve a normal-looking hand, and that distinction matters.
There will be scars and differences in shape. What is achieved in most cases is good function, and children adapt far better than adults anticipate.
Frequently yes, especially when several fingers are joined: both sides of the same finger are never released in one operation because its blood supply would be compromised.
Growth can also produce contracture needing adjustment years later. The whole is planned from the start.
Yes. Some hand differences are associated with problems in other organs — heart, kidney, spine, blood — and that is why a full paediatric assessment is done before scheduling any surgery.
In most cases the difference is isolated, but ruling that out is part of the process.
Question not answered here? There are more answers in the frequently asked questions.
