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Health condition · Clinically reviewed

Osteosarcoma, the bone pain that is not growing pains.

The most common primary bone cancer in children and young people. Early recognition and specialist sarcoma centre care make a real difference to outcomes.

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Why trust this guide

  • 01

    Clinically reviewed

    Written by our editorial team and reviewed by a registered UK clinician before publication.

  • 02

    Sourced from guidance

    Checked against NICE NG12 and specialist bone sarcoma standards you can see at the end.

  • 03

    Current for 2026

    Reflects modern UK practice, including specialist commissioned sarcoma MDT pathways and neoadjuvant chemotherapy protocols.

Key facts

Osteosarcoma at a glance.

The essentials, in plain English, what it is, where it strikes and how UK sarcoma teams treat it today.

  • What it is

    The most common primary bone cancer, arising from bone-forming cells at sites of rapid skeletal growth.

  • Who it affects

    Mostly children, adolescents and young adults, with a smaller second peak in older adults.

  • Where it starts

    Most often around the knee, the distal femur or proximal tibia, and the proximal humerus.

  • Classic symptom

    Persistent bone pain, often worse at night, sometimes wrongly put down to growing pains.

  • First imaging

    Plain X-ray, looking for a sunburst pattern or Codman triangle, then MRI for local staging.

  • Where it spreads

    The lungs are by far the most common site of metastasis, so CT chest is part of every staging work-up.

Why this guide matters

Speed and specialist care, both matter.

Osteosarcoma is rare, but recognising it quickly and getting to the right specialist centre changes what happens next. The three points below shape everything else on this page.

  • Bone pain in a child needs a second look

    Persistent, one-sided or worsening bone pain, especially at night, should not be assumed to be growing pains.

  • Biopsy belongs at the sarcoma centre

    A biopsy performed anywhere else can compromise limb-salvage surgery later. Referral comes first, biopsy comes after.

  • Chemotherapy and surgery work as a pair

    Neoadjuvant chemotherapy, then surgery, then further chemotherapy is the standard sequence, planned by a specialist MDT.

How the diagnosis is made

From first symptoms to a specialist plan.

The steps a UK GP, paediatrician or sarcoma centre normally follows, in order, so you know what to expect and why.

  1. 01

    Recognising

    Urgent referral

    NICE NG12 recommends referring any child or young person with unexplained bone swelling or pain within 48 hours.

  2. 02

    Recognising

    Clinical assessment

    Localised pain, swelling, a palpable mass, reduced range of movement and, occasionally, a pathological fracture.

  3. 03

    Staging

    Plain X-ray

    First-line imaging, looking for the characteristic sunburst appearance and Codman triangle at the growth plate.

  4. 04

    Staging

    MRI for local staging

    Defines tumour extent within bone and soft tissue, and its relationship to the joint, nerves and vessels.

  5. 05

    Staging

    CT chest for metastatic staging

    The lungs are the commonest site of spread, so chest imaging is essential before treatment starts.

  6. 06

    Planning

    Bone biopsy at a sarcoma centre

    Essential before any treatment, and must be performed by the treating specialist centre, never beforehand elsewhere.

  7. 07

    Planning

    Specialist bone sarcoma MDT

    A commissioned multidisciplinary team plans chemotherapy, surgery and rehabilitation together from the outset.

Typical timeline: referral to a settled treatment plan within a few weeks at a specialist sarcoma centre.

Symptoms

What osteosarcoma actually looks like.

The classic picture of persistent bone pain and swelling around the knee or shoulder, and the features that mean it is time to escalate.

  • Persistent bone pain

    Often worse at night and easy to mistake for growing pains, this is the symptom that most often delays diagnosis.

  • Localised swelling

    A firm, sometimes warm swelling over the affected bone, usually around the knee or shoulder.

  • Palpable mass

    A distinct lump can often be felt once the tumour has grown beyond the bone surface.

  • Reduced range of movement

    Pain and swelling near a joint can limit how far the knee, shoulder or hip will move.

  • Pathological fracture

    Occasionally the first sign is a fracture from a minor injury, because the weakened bone gives way.

  • Night pain that wakes a child

    Pain severe enough to disturb sleep is a stronger warning sign than pain only felt during activity.

  • Growth-plate location

    Most tumours arise around the knee or proximal humerus, at sites of the fastest bone growth.

  • Red flag - unexplained bone swelling

    Any unexplained bone swelling or persistent pain in a child or young person needs urgent 48-hour referral.

Treatment

How osteosarcoma is treated in the UK.

Chemotherapy before and after surgery, limb-salvage where possible, and rehabilitation and psychological support throughout, all led by a specialist commissioned bone sarcoma MDT.

  • Neoadjuvant chemotherapy

    Chemotherapy given before surgery to shrink the tumour and treat micrometastatic disease early.

  • Limb-salvage surgery

    The standard surgical approach where feasible, removing the tumour while preserving a functioning limb.

  • Amputation

    Reserved for cases where limb-salvage surgery is not feasible, followed by prosthetic rehabilitation.

  • Adjuvant chemotherapy

    Further chemotherapy after surgery, guided by how well the tumour responded to the neoadjuvant course.

  • Radiotherapy

    A limited role given the relative radioresistance of osteosarcoma, reserved for specific surgical or palliative situations.

  • Physiotherapy and rehabilitation

    A core part of MDT care, restoring strength and function after limb-salvage surgery or amputation.

  • Prosthetic services

    Specialist fitting and review for patients who have had an amputation, alongside gait and mobility rehabilitation.

  • Psychological support

    Given the age group and intensity of treatment, structured psychological support runs alongside every stage of care.

What this guide is based on

The sources behind every claim on this page.

UK national guidance and specialist society standards, current at the time of last review.

Key references

Guidelines and standards we relied on.

A quiet reminder

This guide is for information, not medical advice.

Your GP, paediatrician or sarcoma specialist knows the child or young person and their history, and can tell you which parts apply to you. If in doubt, get seen.

  • NICE. Suspected cancer: recognition and referral (NG12).

  • NHS England. Specialist commissioning standards for bone sarcoma services.

  • European Society for Medical Oncology (ESMO). Bone sarcomas clinical practice guideline.

  • Children’s Cancer and Leukaemia Group (CCLG). Osteosarcoma information for families.

Red flags

When osteosarcoma needs urgent attention.

These are the situations that need urgent referral or specialist review, not watchful waiting.

  • Unexplained bone swelling or pain

    In a child or young person this warrants urgent referral within 48 hours under NICE NG12, not a period of watchful waiting.

  • Night pain

    Bone pain severe enough to wake a child from sleep is a stronger warning sign than pain that only appears with activity.

  • Pathological fracture

    A fracture from a minor injury or fall can be the first presentation of an underlying bone tumour.

  • Rapidly enlarging mass

    A lump that is growing quickly, firm, and fixed to underlying bone needs urgent specialist assessment.

  • Respiratory symptoms at diagnosis

    New cough or breathlessness can reflect pulmonary metastases, the most common site of spread, and needs CT chest.

  • Delayed diagnosis after "growing pains"

    Persistent, one-sided or worsening pain misattributed to growing pains deserves re-review and imaging.

  • Biopsy performed outside the sarcoma centre

    A biopsy done before referral can compromise limb-salvage surgery and must be avoided; refer first.

  • Signs of chemotherapy toxicity

    Fever, unexplained bruising or severe mucositis during treatment need urgent oncology assessment.

  • Psychological distress

    The intensity of treatment and the age group mean low mood or anxiety deserve proactive psychological support, not just clinical review.

Living with it

A hard road, with a clear team behind it.

Four things that make the biggest difference through treatment and beyond, leaning on the specialist MDT, patient rehabilitation, early psychological support and long-term follow-up.

A quiet reminder

You do not have to hold this alone.

A specialist sarcoma centre brings oncology, surgery, physiotherapy and psychological support together, so families are never navigating this piecemeal.

  1. 01 Team

    Lean on the specialist MDT

    A commissioned bone sarcoma centre coordinates chemotherapy, surgery, rehabilitation and psychological support as one plan.

  2. 02 Rehab

    Rehabilitation takes time

    Physiotherapy and, where needed, prosthetic fitting are gradual processes that continue well beyond the operation itself.

  3. 03 Support

    Ask for psychological support early

    The age group and treatment intensity make this a normal and important part of care, not an optional extra.

  4. 04 Follow-up

    Long-term surveillance matters

    Regular review watches for recurrence and for late effects of chemotherapy, including on the heart, kidneys and hearing.

Frequently asked

Everything we get asked about osteosarcoma.

Quick answers on recognition, staging, biopsy timing and treatment.

  • What is osteosarcoma?

    Osteosarcoma is the most common primary bone cancer, arising from bone-forming cells. It typically affects children, adolescents and young adults, most often around the knee or the proximal humerus, at sites of rapid bone growth.

  • Why is osteosarcoma sometimes mistaken for growing pains?

    Because the persistent bone pain it causes, especially when worse at night, can resemble the aches many children experience during growth spurts. This is an important diagnostic pitfall, which is why NICE NG12 recommends urgent 48-hour referral for any unexplained bone swelling or pain.

  • How is osteosarcoma diagnosed?

    An X-ray is the first-line investigation and may show a sunburst appearance or Codman triangle. MRI then stages the tumour locally, and CT chest checks for lung metastases, the most common site of spread. A bone biopsy at a specialist sarcoma centre confirms the diagnosis and must happen before any treatment.

  • Why must the biopsy be done at a specialist centre?

    A poorly placed or performed biopsy can seed tumour cells along the biopsy track and compromise later limb-salvage surgery. NICE NG12 and specialist commissioning standards require biopsy at the treating sarcoma centre, by the team that will carry out definitive surgery.

  • What does treatment for osteosarcoma involve?

    The standard approach is neoadjuvant chemotherapy to shrink the tumour, followed by limb-salvage surgery, or amputation if that is not feasible, and then further adjuvant chemotherapy. Radiotherapy plays a limited role because osteosarcoma is relatively radioresistant.

  • What support is available after treatment?

    Multidisciplinary rehabilitation, including physiotherapy and prosthetic services after amputation, alongside structured psychological support given the intensity of treatment and the age group affected. Long-term surveillance continues afterwards to watch for recurrence and late effects of chemotherapy.

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