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Childhood Bone Cancer — Parent’s Guide
Osteosarcoma treatment & limb-sparing surgery — what every parent needs to know
Medically reviewed by Dr. Muralidhar Muddusetty, MS (Surgical Oncology) · Last reviewed June 2026
If your child has been told they may have osteosarcoma — a bone cancer most common in active teenagers — this page is written for you. It explains what osteosarcoma is, how it is diagnosed, what osteosarcoma treatment involves, and what limb-sparing surgery means in practice. We believe you deserve clear, honest information before your next appointment so you can ask the right questions and make confident decisions.
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Understanding the diagnosis
What is osteosarcoma?
Bone is living tissue. It contains specialised cells called osteoblasts that build new bone material throughout a person’s life — and most intensively during the growth spurts of childhood and adolescence. Osteosarcoma is a cancer that arises from osteoblasts that have undergone a change causing them to divide uncontrollably rather than build bone normally. The result is a tumour within or around a bone that grows and, if untreated, can spread to other parts of the body — most commonly the lungs.
Osteosarcoma is the most common primary bone cancer in children and adolescents. It tends to appear during the years of rapid bone growth — most often between the ages of ten and twenty — and is slightly more common in boys than in girls. The tumour most often develops near the growth plates of the longest bones in the body: the lower end of the thigh bone (femur), the upper end of the shin bone (tibia) — both near the knee — and the upper arm bone (humerus). Less commonly it arises in the hip, jaw, or elsewhere. Understanding where the tumour is and how it relates to the surrounding structures is one of the most important parts of planning treatment.
Most cases of osteosarcoma arise in children with no family history of bone cancer and no pre-existing condition. A small number of children who have received radiation therapy for an earlier childhood cancer, or who have certain rare hereditary conditions, carry a modestly higher risk. Regardless of how the diagnosis arose, osteosarcoma was not caused by a sports injury, by diet, by physical activity, or by anything a parent did or did not do. It arises from a change within the bone cell itself.
Osteosarcoma has been studied and treated under structured clinical protocols for several decades. The approach combines chemotherapy with surgery, and for most children today surgery means limb-sparing surgery — removing the tumour while keeping the arm or leg. At CION, every child’s case is reviewed by a tumour board that includes a medical oncologist, a surgical oncologist, and a radiation oncologist before any treatment plan is finalised. No decision is made by a single doctor alone.
Related pages: Pediatric cancer overview · How childhood cancer is staged · Paediatric cancer care in Hyderabad
Diagnosis explained
How is osteosarcoma diagnosed?
Reaching the correct diagnosis before starting any treatment is essential — the biopsy incision placement and imaging workup directly affect which surgical options are available. Here is what each step in the diagnostic journey involves.
Step 1
Plain X-ray of the affected bone
An X-ray is usually the first investigation ordered when a child presents with persistent bone pain or swelling. In osteosarcoma the X-ray often shows a characteristic pattern: irregular new bone formation (called a “sunburst” pattern) alongside areas where normal bone has been destroyed. This pattern alerts the doctor that a bone tumour is possible and triggers the next investigations. An X-ray cannot confirm the diagnosis on its own, but it guides urgency.
- Available at most hospitals
- Quick and low-radiation
- Alerts to the need for further imaging
Step 2
MRI scan of the affected bone
An MRI scan gives the care team a detailed map of the tumour within the bone and the surrounding soft tissue. It shows precisely how far the tumour extends along the bone (called the intramedullary extent), whether it has broken through the bone’s outer shell (cortex), and how close it comes to major blood vessels, nerves, and the nearby joint. This information is critical for planning whether limb-sparing surgery is safe and feasible and, if so, exactly what the surgery will involve.
- No radiation — uses magnetic fields
- Maps tumour extent within the bone
- Essential for surgical planning
Step 3
CT scan of the chest
Osteosarcoma can spread through the bloodstream, and the lungs are the most common site of spread (metastasis). A CT scan of the chest is done at diagnosis in every case to check whether there are any deposits in the lungs. If lung deposits are present, this is called metastatic osteosarcoma and it influences the treatment plan — it does not remove the possibility of treatment, but the programme is more intensive and may include surgery to the lungs as well as the primary bone tumour.
- Checks for lung metastases
- Done at diagnosis and at intervals during treatment
- Results influence treatment intensity
Step 4
Bone scan or PET-CT
A bone scan or PET-CT scan is used to check whether cancer has spread to any other bones in the body. Osteosarcoma can occasionally produce deposits in distant bones in addition to — or instead of — lung metastases. Identifying all sites of disease before treatment begins ensures that the plan addresses everything, not just the primary tumour. The osteosarcoma chemo protocol is designed to treat disease at all sites simultaneously, which is one of the reasons it is given before and after surgery rather than only after.
- Whole-body evaluation of bone involvement
- PET-CT also assesses soft-tissue and lymph-node involvement
- Required before finalising the treatment plan
Step 5 — Critical
Biopsy — the definitive step
A biopsy — taking a small tissue sample from the tumour to examine under a microscope — is the only way to confirm the diagnosis of osteosarcoma. The biopsy must be planned and performed by the same surgeon who will carry out the definitive surgery. This is because the incision used for the biopsy must be placed so that it can be fully included within the area removed during the final operation. A biopsy done by a different team, in the wrong location, can limit or eliminate the option of limb-sparing surgery. The tissue sample is reviewed by a specialist bone tumour pathologist. No treatment should begin until this result is available and reviewed by the multidisciplinary team.
- Must be done by the treating surgical team
- Incision placement is critical for later surgery
- Pathology confirms osteosarcoma type and grade
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Meet the Specialists
17+ senior cancer specialists. One panel for your case.
Trained at AIIMS, Tata Memorial, and leading international centres. Combined 150+ years of experience. Every complex case is reviewed by 3+ of them — together.
Medical Oncologist
Medical Oncologist
Dr. C. Raghavendra Reddy
MBBS(Gold Medal), DNB(General Medicine), DM(Medical Oncology)(Gold Medal)
Medical Oncologist
Dr. Bharati Devi Gorantla
MBBS, MD(General Medicine), DM(Medical Oncology)(Adyar,Chennai), ECMO, MRCP SCE(UK)
Medical Oncologist
Dr. Owais Mohammed
MBBS, MD (General Medicine), DrNB (Medical Oncology), ECMO, MRCP SCE (Medical Oncology) (UK)
Medical Oncologist
Medical Oncologist
Surgical Oncologist
Dr. Muralidhar Muddusetty
MBBS (AIIMS), MS (Surgery) (AIIMS), DNB (Surgical Oncology), MRCS (Edinburgh)
Surgical Oncologist
Surgical Oncologist
Surgical Oncologist
Dr. Vinay Mamidala
MBBS, MS(General Surgery), M.Ch(Surgical Oncology), FMAS, FARIS(Ongoing)
Surgical Oncologist
Radiation Oncologist
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Hematologist
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Dr. Mohammed Imran
Surgical Oncologist
Dr. Vajja Sandeep Kumar
MBBS, MS (General Surgery), DrNB (Surgical Oncology), FALS Oncology
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Treatment journey
Osteosarcoma treatment — what happens at each stage
The treatment of osteosarcoma follows a structured sequence that has been refined over decades. Understanding each step helps you know what to expect and what questions to ask at each point along the way.
Multidisciplinary tumour board review
Before any treatment begins, your child’s case — including the imaging and biopsy result — is reviewed by a team that includes a medical oncologist, a surgical oncologist, a radiation oncologist, and a bone tumour pathologist. This is not a formality: the tumour board discussion determines the order of treatment, which chemotherapy protocol is appropriate, and whether the tumour is located in a position that makes limb-sparing surgery safe. At CION, every case goes to the board before the family is given the plan. You should never receive a treatment recommendation from a single doctor without a multidisciplinary review.
CION: Tumour board for every patient — no exceptionsPre-operative chemotherapy (neoadjuvant osteosarcoma chemo)
Chemotherapy is started before surgery in almost all cases of localised osteosarcoma. This pre-operative chemotherapy is sometimes called neoadjuvant treatment. It has two important purposes. First, it shrinks the tumour, which makes surgery more straightforward and may improve the chances of achieving a clear margin around the tumour. Second — and crucially — it begins treating any microscopic cancer cells that may have already left the primary tumour and entered the bloodstream. These microscopic deposits cannot be detected by any scan, but treating them early is thought to be an important part of preventing future spread. Chemotherapy is given in cycles over several weeks, and the care team monitors the response using imaging at the end of pre-operative treatment.
Assessment of chemotherapy response
After the pre-operative chemotherapy is complete, an MRI scan is repeated to reassess the tumour. The care team evaluates how much the tumour has shrunk and whether the boundary between the tumour and the surrounding structures has changed. This helps confirm whether limb-sparing surgery remains the surgical plan. The tumour board reviews the response assessment before surgery is scheduled, and the surgical and medical oncology teams decide together on the final surgical approach and the post-operative chemotherapy programme.
The degree of tumour kill at surgery also helps guide the choice of post-operative chemotherapySurgery — limb-sparing in the majority of children
Surgery removes the segment of bone and surrounding tissue containing the tumour. For most children with osteosarcoma today, this is achieved through limb-sparing surgery (also called limb-salvage surgery) — the arm or leg is kept intact and functional. The removed section of bone is replaced with a custom metal implant (endoprosthesis), a bone graft, or a combination of both. In growing children with a tumour near the knee, a specially engineered expanding implant can be lengthened at intervals as the child grows, preventing a leg-length difference from developing. The surgeon removes the tumour together with a margin of normal tissue all around it, and the pathologist examines this margin at the time of surgery to confirm that no cancer cells were left behind. Amputation is required in a small number of cases where the position of the tumour makes limb-sparing technically unsafe, but this is not the norm in contemporary osteosarcoma care.
Post-operative chemotherapy (adjuvant osteosarcoma chemo)
After surgery, chemotherapy continues for several more months. The post-operative programme is designed to eliminate any remaining cancer cells that the surgery could not address and to reduce the risk of the cancer returning in the future. The specific chemotherapy agents and the number of cycles are determined by the tumour board based on the child’s age, the size and location of the original tumour, and how much of the tumour was killed by the pre-operative treatment (called the histological response). The full chemotherapy programme — before and after surgery together — typically spans several months.
Physiotherapy and rehabilitation
After limb-sparing surgery, structured physiotherapy is an essential part of recovery. The aim is to rebuild the strength and movement of the affected limb, and to help the child return to school, social activities, and as much normal function as possible. Rehabilitation begins early — often within days of surgery — and continues for months. The physiotherapy team works closely with the surgical team to understand exactly what was reconstructed and to design a programme appropriate for that specific implant or graft. Children who undergo limb-sparing surgery can, over time, use their limb for most daily activities, though what is appropriate varies depending on the location of the surgery and the type of reconstruction.
Rehabilitation is part of the treatment plan, not an optional add-onLong-term follow-up
After active treatment ends, regular follow-up is essential. CT scans of the chest are done at regular intervals to check that the lungs remain clear. X-rays or MRI scans of the primary tumour site are also done to monitor the surgical reconstruction and check for local recurrence. Blood tests assess bone marrow recovery and general health. Children who received certain chemotherapy agents need cardiac monitoring. Growing children with an expanding implant will need planned procedures to lengthen the implant. The follow-up schedule is lifelong in some respects, though the intervals between appointments become less frequent as time passes without any sign of recurrence. At CION we walk this journey with your family beyond active treatment.
Limb-sparing surgery explained
What limb-sparing surgery means — and what to expect
Limb-sparing surgery is now the standard approach for most children with osteosarcoma. Here is what the key aspects of limb-salvage surgery mean in practical terms.
Metal implant reconstruction (endoprosthesis)
After the affected segment of bone is removed, a custom-designed metal implant replaces it. The implant is anchored into the remaining bone above and below the resected area. It restores the structure of the limb and allows the child to bear weight and move the limb. Modern implants are designed for durability and can last many years, though some children may need a revision surgery during their lifetime.
Expanding (growing) implants for children
When the tumour is near the knee in a child who is still growing, a standard fixed-length implant would cause a progressive difference in leg length as the unaffected leg continues to grow. Expanding implants solve this: they contain a mechanism that allows the implant to be lengthened non-surgically or with a small procedure at planned intervals as the child grows, keeping leg lengths equal. The use of an expanding implant is discussed when planning surgery and depends on how much growth remains.
Bone graft reconstruction
In some situations, the resected bone is replaced using a large piece of bone from a bone bank (called an allograft) or, in selected cases, bone taken from another site on the child’s own body. Bone grafts integrate over time with the child’s existing bone. Some reconstructions combine a metal implant with a bone allograft to take advantage of both approaches. The choice of reconstruction is individualised to the child’s age, the location of the tumour, and the surgeon’s assessment of what will give the most durable and functional result.
When limb-sparing is not possible
In a small number of cases — where the tumour is very close to or involving the major blood vessels or nerves supplying the limb, or where the biopsy was performed in a way that compromises the surgical options — amputation may be the safer choice for achieving clear margins and preventing local recurrence. This is a decision made by the tumour board, not by a single surgeon, after reviewing all available information. The goal is always to give the child the best oncological outcome while preserving as much function as the situation allows. Decisions for healing, not for convenience, guide every recommendation at CION.
What to expect after surgery
After limb-sparing surgery, the child typically remains in hospital for several days. Pain is managed with appropriate medications. Physiotherapy begins early to gently mobilise the limb. Most children require walking aids for several weeks while the reconstruction heals and strength is rebuilt. Return to school often happens within a few weeks, depending on how the child is feeling. Full return to physical activities is a gradual process over months and is guided by the physiotherapy team in close consultation with the surgical oncologist.
Lung surgery (pulmonary metastasectomy)
When osteosarcoma has spread to the lungs, surgical removal of the lung deposits — called pulmonary metastasectomy — is an important part of treatment in appropriate cases. This is a separate operation from the primary bone tumour surgery, usually performed by a thoracic surgeon working as part of the multidisciplinary team. The decision to proceed with lung surgery, and its timing relative to chemotherapy and bone surgery, is made at the tumour board. In carefully selected patients, removal of lung deposits forms an integral part of the overall treatment strategy.
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Common questions
Your questions about osteosarcoma — answered
What is osteosarcoma and which children are most affected?
Osteosarcoma is a type of bone cancer that starts in the cells responsible for making new bone tissue. It is the most common primary bone cancer in children and adolescents. The tumour most often forms near the growth plates of long bones — frequently around the knee (lower femur or upper tibia), but also in the upper arm bone (humerus) and occasionally in other locations. The disease tends to appear during the teenage years when bones are growing quickly, and it affects boys slightly more often than girls. Most cases arise without any identifiable family history or prior condition. A small number of children with certain hereditary conditions or who have received radiation therapy in the past for an earlier cancer carry a higher risk, but the great majority of osteosarcoma cases occur by chance in otherwise healthy adolescents.
What signs or symptoms should a parent watch for?
The most common early sign of osteosarcoma is persistent pain around a bone — typically near the knee, shoulder, or hip — that does not go away with rest and is not clearly linked to an injury. The pain often becomes worse at night or during physical activity. A visible or palpable swelling over the affected bone may develop over time, and the skin overlying the swelling may feel warm. Some children begin to limp, or find it painful to fully move a nearby joint. Because teenage bone pain after sports is common, osteosarcoma is sometimes initially dismissed as a sports injury or growing pains. The key warning signal is pain that persists for more than two to three weeks, does not improve with rest or simple pain relief, and is associated with swelling. Any child with these features should be assessed promptly by a doctor who will request an X-ray as a first step.
How is osteosarcoma diagnosed?
Diagnosis begins with a plain X-ray of the affected bone, which often shows a characteristic pattern including new bone formation and destruction. An MRI scan is then performed to map the exact extent of the tumour within the bone and surrounding soft tissue. A CT scan of the chest is done to check whether the tumour has spread to the lungs. A bone scan or PET-CT may be used to look for spread to other bones. The definitive diagnosis requires a biopsy — a carefully planned surgical procedure to remove a small sample of the tumour for examination under a microscope. The biopsy must be planned and performed by the same surgeon who will later perform the definitive surgery, because the incision placement can affect the surgical options available. No treatment should start before the biopsy result is reviewed by an experienced bone tumour pathologist.
What does osteosarcoma treatment involve?
Osteosarcoma treatment is delivered in two broad phases. The first phase is pre-operative chemotherapy (called neoadjuvant chemotherapy), which is given for several weeks before surgery. This treatment works to shrink the tumour, kill any cancer cells that may have spread elsewhere in the body before they can be detected, and allow the surgeons to assess how well the tumour has responded. After chemotherapy, surgery is performed to remove the tumour — in the majority of children this is limb-sparing surgery, which removes the tumour while preserving the arm or leg. Following surgery, chemotherapy continues for several more months. In certain situations where the tumour has spread to the lungs, surgery to remove the lung deposits may also be planned. Every child’s plan is reviewed at a multidisciplinary tumour board before any treatment begins.
What is limb-sparing surgery and can every child have it?
Limb-sparing surgery — sometimes called limb-salvage surgery — removes the section of bone and tissue containing the tumour while keeping the child’s arm or leg intact and functional. The removed segment of bone is replaced with a metal implant (endoprosthesis), a bone graft from another site, or a combination of the two. For tumours near the knee in a growing child, a specially designed growing implant can be extended as the child grows, avoiding the length difference that would otherwise develop between the two legs. Whether limb-sparing surgery is possible depends on how close the tumour is to major blood vessels and nerves, how well the tumour responded to pre-operative chemotherapy, the age of the child, and the location of the biopsy incision. The majority of children with osteosarcoma today are able to have limb-sparing surgery. The decision must be made by a specialist bone tumour surgical team in discussion with the family.
What questions should I ask at the first oncology appointment?
At the first appointment, the most useful questions to ask include: Has the biopsy confirmed osteosarcoma, and has the sample been reviewed by a bone tumour pathologist? Has the case been discussed at a multidisciplinary tumour board? Is limb-sparing surgery an option for my child, and what will determine that decision? What is the planned sequence of chemotherapy and surgery, and roughly how long will the whole treatment take? Will my child need a growing implant? What side effects should we watch for during chemotherapy? What does long-term follow-up look like after treatment ends? You deserve a full 45-minute conversation to have all of these addressed — not a rushed answer. At CION, every consultation is given the time it needs.
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