This is the coverage and reconstruction of defects in the arms and legs after severe trauma: when bone, tendon or fixation material is left exposed and there is not enough skin to close.
The typical situation is an open fracture of the tibia from a road accident. The bone is fixed, but the skin of the leg is scarce and the trauma destroyed part of it, so bone or a plate is left uncovered. That does not close on its own and will not take a graft, because bone cannot feed it: living tissue with its own blood supply has to be brought in. It is team surgery with orthopaedics, and timing matters: early coverage significantly reduces the risk of bone infection, which is the complication that ruins most limbs.
There is a conversation that belongs to this field and that almost nobody puts in writing. Saving the limb is not always the best decision. When the injury destroyed the nerves supplying sensation to the sole of the foot, when the bone loss is very extensive or when the patient's condition will not tolerate many months of treatment, a saved limb can end up numb, painful, with no useful weight-bearing and after years of operations, while a well-fashioned amputation with a good prosthesis allows walking within months. It is decided with the patient, with all the information and without pressure.
It usually helps when there is
- An open fracture with bone or fixation material uncovered.
- Extensive skin loss on an arm or leg after trauma.
- A wound that will not close over an operated area or with tendon exposed.
- Bone infection requiring debridement and coverage with living tissue.
- The consequences of trauma with a defect of cover or contour.
Worth discussing first if
- An injury with nerve destruction leaving the foot without sensation.
- Peripheral vascular disease, which compromises any flap.
- Uncontrolled diabetes or current smoking.
- General health that will not tolerate prolonged, repeated surgery.
- A situation where a planned amputation gives better function and in less time.
None of these rules the procedure out on its own; all of them change the conversation.
How it is covered
You climb the reconstructive ladder only as far as necessary.
Skin graft
When there is a good-quality bed and no bone or tendon exposed. It is the simplest and quickest solution.
Local or regional flap
Neighbouring tissue moved with its blood supply. It works well for defects of the upper and middle third of the leg.
Free flap
Tissue from elsewhere in the body reconnected with microsurgery. It is what is indicated in the lower third of the leg, where there is no local tissue available.
Cover early and over clean tissue
Two principles order this treatment. The first is time: covering an open fracture in the first days significantly reduces bone infection, which is the complication that ruins most limbs and the one that turns a treatment of months into one of years. The second is cleanliness: you do not cover over devitalised or infected tissue. It is debrided as many times as necessary, even if that enlarges the defect, because a flap placed over dirty tissue fails.
Location decides the technique. In the upper and middle third of the leg there is neighbouring muscle available and local flaps usually suffice; in the lower third and the ankle there is no tissue to spare and the usual solution is a microsurgical free flap. Forcing a local flap where there is none ends in necrosis.
And it is all done as a team with orthopaedics: fixing the bone, the coverage and bone reconstruction if bone is missing are planned together and in an agreed order. Isolated decisions by each speciality are the most frequent cause of treatments that drag on.
What the process is like
It is a staged treatment that can last months.
Joint assessment
With orthopaedics, the bone, the circulation and the nerves are assessed, and the choice between reconstructing and amputating is made with the patient where that question exists.
Debridements
Repeated surgical cleaning until only viable tissue remains. It may require several sessions and negative-pressure dressings.
Coverage
Graft, local flap or free flap according to the area and the defect. The first days of monitoring are critical if microsurgery was used.
Bone reconstruction and rehabilitation
If bone is missing, its reconstruction follows afterwards. Rehabilitation runs alongside the whole process and defines the final function.
What to expect
It is among the longest treatments in the catalogue.
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Weeks 1 to 2
Hospital stay, monitoring of the coverage and strict rest with the limb elevated. No weight-bearing on the limb.
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Weeks 3 to 8
The coverage consolidates and dressings continue. Movement begins and, if the bone allows, progressive weight-bearing as directed by orthopaedics.
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Months 3 to 6
Intensive rehabilitation. Walking and joint range are recovered. A compression stocking is used on the reconstructed leg.
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Months 6 to 18
Consolidated result. There may be refinement surgery on the contour of the flap, which usually ends up bulky.
Risks, and what is not promised
The greatest in the catalogue taken as a whole: partial or total failure of the flap from thrombosis, persistent bone infection, failure of the fracture to heal, joint stiffness, chronic pain, venous thrombosis and the need for multiple reoperations. The complications of the donor area are added to those of the limb treated.
And the outcome that has to be named: despite correct treatment, a proportion of these limbs end in amputation, whether from uncontrollable infection, from failure of the reconstruction or from a final function so poor that the patient themselves asks for it. Not saying so beforehand is what makes that decision, when it comes, far harder.
A normal limb is not promised: after severe trauma, some limitation of movement, strength or sensation is the norm, along with a reconstructed area that looks different. Nor is it promised that saving the limb is always the best option. These risks are reduced by early coverage, adequate debridement, teamwork and giving up smoking. They are not eliminated. The ones that apply to your 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 we are asked most about limb reconstruction
No, and it is a conversation worth having honestly. When the injury destroyed the nerves supplying sensation to the sole of the foot, when a lot of bone is missing or when the treatment is going to last years, a saved limb can end up numb, painful and with no useful weight-bearing.
In those cases, a well-fashioned amputation with a good prosthesis allows walking within months. It is decided with the patient, with all the information and without pressure.
Because exposed bone becomes infected. And an established bone infection is the complication that ruins most limbs: it turns a treatment of months into one of years and sometimes ends in amputation.
Covering in the first days significantly reduces that risk. That is why the reconstruction is planned from admission, together with orthopaedics.
Several, almost always. First the debridements, then the coverage, then reconstruction of the bone if it is missing, and finally refinements of the contour.
It is a staged treatment that can extend over months, and that burden is part of the decision from the start.
After severe trauma some limitation usually remains: of movement, of strength or of sensation, and sometimes a limp. The realistic goal is a limb that works and does not hurt, not a limb identical to the one before.
Rehabilitation weighs as much as the surgery in that result, and it is the part that most depends on the patient.
Question not answered here? There are more answers in the frequently asked questions.
