Medical Oncologist
CION Cancer Clinics
Allograft and biological reconstruction | CION Cancer Clinics
An allograft is donor bone used to fill the gap left when a tumour is cut out of a bone. Your own bone slowly grows into it, so the limb is rebuilt with bone rather than only metal. It suits some tumours and some people better than others, and it heals slowly. This page explains the options, the healing, the problems and the questions to ask your surgeon. CION Cancer Clinics’ surgical oncologists in Hyderabad can talk this through with you.
MI
Medically reviewed by Dr. Mohammed ImaduddinConsultant Surgical Oncologist · MBBS, MS (General Surgery), MCh (Surgical Oncology) · last reviewed September 2026, next review due September 2027
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On this page
- What is allograft reconstruction after a bone tumour?
- What kinds of biological reconstruction are there?
- How does a donor bone join and heal?
- How does donor bone compare with a metal implant?
- Who is it not suitable for, and what can go wrong?
- What do families worry about with donor bone?
- What do the words in your notes mean?
- Common questions about allograft reconstruction
The short answer
What is allograft reconstruction after a bone tumour?
An allograft is a piece of bone from a donor, used to fill the gap left when a surgeon removes a tumour from your bone. Over time your own bone grows into the ends of it, so the limb is rebuilt with bone rather than only metal.
Why a gap has to be filled at all
To remove a bone tumour safely, the surgeon takes out the tumour with a rim of healthy bone around it. That can leave a long gap in the thigh bone, the shin bone or the upper arm. Without something in that gap, the limb cannot carry weight. The team can fill it with a metal implant, with bone, or with a mix of the two.
What "biological" means here
Biological reconstruction means using bone rather than a manufactured joint. The bone may come from a donor, from another part of your own body, or from your own removed bone after it has been treated to kill the tumour cells. The hope is that, once it has joined, the rebuilt bone lasts for many years and does not wear out the way a metal part can.
This page explains the options. It cannot tell you which one suits your tumour. That decision belongs to your surgical team, after they have seen your scans and biopsy.The options
What kinds of biological reconstruction are there?
Each uses bone in a different way. Many operations combine two of them.
Donor bone (allograft)
Bone taken from a deceased donor, screened for infection, then cleaned and frozen or freeze-dried by a bone bank. It is cut to match your gap and fixed with metal plates or a rod.
Often used for
- Long gaps in the middle of a bone
- Rebuilding a joint surface
Your own bone (autograft)
A piece of your own bone, often the thin outer bone of the lower leg (the fibula), moved into the gap. Sometimes its blood vessels are joined up, so the bone stays alive from the first day.
It adds a second wound where the bone was taken.Your own treated bone
The removed bone is cleared of the tumour, treated outside the body to kill any cancer cells left in it, and put back. It fits exactly because it is your own shape.
Only possible when
- The bone is still strong enough
- The tumour has not destroyed too much of it
Bone and metal together
A donor bone is combined with a metal joint, so the joint moves and the bone gives the muscles and tendons something to reattach to. It is used most around the hip, shoulder and knee.
Not sure whether this applies to you?
Ask an oncologistAfter the operation
How does a donor bone join and heal?
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The first days in hospital
The limb is protected and kept still. Drains, pain relief and antibiotics are the focus. A physiotherapist starts gentle movement of the joints that are not part of the repair.
-
Protected walking
You walk with crutches or a walker and put little or no weight through the rebuilt bone. The plates and rod hold it, but the bone has not joined yet, so the team sets a clear limit.
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The ends start to join
Your own bone slowly grows across each junction with the graft. X-rays at follow-up visits show whether this is happening. Chemotherapy, if you need it, can slow this joining down.
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Weight is added in stages
Only when the X-rays show solid joining does the team allow more weight. This often takes many months, and longer than families expect.
-
Long-term follow-up
You keep having scans, both to check the bone and to watch for the tumour coming back. The graft is never fully replaced by living bone, so checks continue for years.
Side by side
How does donor bone compare with a metal implant?
Donor bone (allograft)
Metal implant (endoprosthesis)
Weight is added slowly, over many months
Walking with weight usually starts sooner
Once joined, it can last a very long time
Parts can loosen or wear and may need changing later
Early problems include the bone not joining or breaking
Early problems include infection and loosening
Depends on a bone bank having a suitable size
Depends on a suitable implant being made or stocked
Keeps more bone for any later operation
Replaces the joint, so a later operation starts from metal
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Being straight with you
Who is it not suitable for, and what can go wrong?
Biological reconstruction does not suit everyone. It asks for patience and a long period of protected walking. For some people a metal implant, or sometimes an amputation, is the more practical operation.
Situations where the team may advise against it
It is harder when the tumour has spread widely into the soft tissue around the bone, when the skin and muscle cover is poor, or after heavy radiotherapy to the area. People who cannot keep weight off the limb for a long time, or who need to walk and work quickly, may be steered towards metal. Your surgeon weighs your age, the tumour, the treatment still to come and how you live.
The problems to know about
The main ones are infection, the graft not joining to your own bone, and the graft cracking or breaking, sometimes long after the operation. Each can mean another operation. Ask your surgeon how often they see these problems in their own patients, and what the plan would be if one happened.
What to ask your centre
Ask whether they have access to a bone bank, how the graft is screened, who will follow up the bone over the years, and what the alternative operation would be for you.
Commonly believed
What do families worry about with donor bone?
"Donor bone will pass on a disease."
Bone banks screen donors and test the bone for infections before it is released, and the bone is treated and stored under strict rules. The risk is very small. You are entitled to ask your centre where the bone comes from and how it was tested.
"The body will reject someone else's bone like a kidney."
Donor bone is processed so that it carries almost no living cells. You do not need lifelong medicines to stop rejection, as you would after an organ transplant.
"Using bone instead of metal means the cancer was not fully removed."
The choice of reconstruction comes after the tumour has been removed. How completely it was removed is shown on the pathology report, not by the type of repair.
"Once it has healed, the leg is as good as new."
A joined graft can serve well for many years, but it is still a rebuilt bone. It needs follow-up, and a heavy fall can still break it.
On your report
What do the words in your notes mean?
- Resection
- The operation to remove the tumour and the section of bone it sits in.
- Margin
- The rim of healthy tissue removed around the tumour. A clear margin means no cancer cells were seen at the edge.
- Union
- The point at which your own bone has grown solidly into the graft. Non-union means it has not joined.
- Vascularised graft
- A graft moved with its own blood vessels, which are joined up so the bone stays alive.
- Intercalary
- A graft that fills a gap in the middle of a bone and leaves the joints at both ends in place.
Questions we are asked
Common questions about allograft reconstruction
Where does the donor bone come from?
From people who agreed to donate tissue after their death, collected and prepared by a licensed bone bank. The bone is screened, tested and stored before any surgeon can use it. Your centre should be able to tell you which bank it works with, and what checks the bone has been through.
How long before I can walk normally?
You will usually walk with support early on, but without full weight on the rebuilt bone. Full weight is allowed only once X-rays show the ends have joined, which often takes many months. Chemotherapy can lengthen this. Your surgeon sets the pace from your scans, not from the calendar.
Can I have chemotherapy while the graft heals?
Yes. Many people with bone tumours need chemotherapy after surgery, and it is not delayed for the graft. It can slow the bone joining and make infection more likely, so the surgical and medical teams plan the timing together and keep a close eye on the wound.
What happens if the graft breaks?
A crack or break is one of the known problems, and it can happen long after the operation. It usually means another operation, to fix the bone with new metal work, add more bone, or change to a metal implant. Tell your team straight away about any new pain or a change in the shape of the limb.
Is it suitable for children?
It can be, and preserving a child's own bone has real value. Growth is the complication, because a graft does not grow with the child. The team may combine it with other methods, or plan for later lengthening. Ask how your child's remaining growth changes the choice.
Will I need the metal plates removed later?
Not usually. The plates and rod often stay in for good, because they protect the graft. They are taken out only if they cause a problem such as pain or infection. Ask your surgeon what they normally do and whether you should expect another operation.
Does it set off airport scanners or stop an MRI?
The metal fixing may set off a scanner, so carry a note from your surgeon when you travel. Most modern fixings are safe in an MRI scanner, but always tell the scan team about them. The pictures near the metal can be less clear, which your doctors take into account.
Is it covered by Aarogyasri or insurance?
Surgery for a bone tumour is usually covered when it is part of an approved treatment plan. Aarogyasri, CGHS, ECHS, EHS and cashless insurance each have their own rules about grafts and implants. Call the helpline with your card details and we will help you check your cover before admission.
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Sources
- Cancer Research UK — Bone cancer
- American Cancer Society — Surgery for osteosarcoma
- National Cancer Institute — Bone cancer
- Macmillan Cancer Support — Bone cancer
This page is general information, not a prescription. Do not change or stop any treatment based on what you read here. If anything is worrying you, contact your own treating team — or call our helpline and we will help you reach the right specialist.
Keep reading
Related pages
Endoprosthetic Replacement After Bone Tumour RemovalThe metal alternative to a bone graftLimb Salvage or Amputation: How the Choice Is MadeWhat the team weighs before choosing an operationRotationplasty ExplainedAnother option, often for childrenThe Pathology Report After SurgeryHow to read the margin on your report
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