Describing a fracture on X-ray
- Reading
A fracture is described in a fixed order (which bone, where, the shape of the break and how far the pieces moved) so that anyone can picture it.
What it is
A good fracture description lets a colleague picture the injury over the phone without seeing the film. It follows the same order every time: the patient and the study (side, views, date), the bone and the part of it (proximal, middle or distal third; epiphysis, metaphysis or diaphysis), whether the line enters a joint, the pattern of the line (transverse, oblique, spiral, comminuted, segmental, avulsion, impacted), and then the displacement of the distal fragment relative to the proximal one: translation, angulation, shortening and rotation. Last come what the film cannot show but the examination can: whether the skin is broken (open fracture) and whether nerves and pulses are intact. A fracture through abnormal bone (a lytic lesion, thin osteoporotic cortex) is called pathological and changes the work-up. At least two views at right angles are needed, because a fracture can be invisible or look undisplaced on a single view.
What to check
- Two views at right angles (usually AP and lateral), including the joint above and the joint below for long-bone shaft fractures.
- Location: bone, side, which third or which part (epiphysis, metaphysis, diaphysis), and intra- or extra-articular.
- Pattern: transverse, oblique, spiral (twisting force), comminuted (three or more fragments), segmental, avulsion, impacted.
- Displacement is that of the distal fragment: translation (as a fraction of shaft width), angulation, shortening, rotation.
- A displaced fracture of one forearm or leg bone is often paired with a second fracture or a dislocation elsewhere in the ring.
- Healing shows as fading of the line and then callus bridging the gap over weeks; it is faster in children.
Reading it step by step (and why)
- Check name, date, side marker and views — a perfect description of the wrong film or side is useless.
- Name the bone and the part (third, metaphysis, diaphysis) — location decides treatment and blood-supply risk.
- Say whether the line reaches a joint surface — intra-articular breaks need an anatomic reduction to limit arthritis.
- Describe the line: transverse, oblique, spiral, comminuted, avulsion — the pattern tells the force and stability.
- Give translation of the distal fragment as a share of shaft width — e.g. «50 % dorsal translation» is clear.
- Give angulation by the direction the distal fragment points (or the apex), and in degrees if measured.
- Note shortening (overlap) and rotation (compare the joints above and below) — both change limb function.
- Look at the joint above and below and the whole film for a second fracture or a dislocation.
- Look at the bone itself: thin cortex, a lytic area or a periosteal reaction suggest a pathological fracture.
- Add the clinical part: open or closed, distal pulses and nerves — they decide urgency more than the film.
| Word | What it means on the film |
|---|---|
| Transverse | Line roughly at right angles to the long axis; usually a direct blow |
| Oblique / spiral | Line slanted, or winding around the shaft; a spiral comes from twisting |
| Comminuted | Three or more fragments |
| Avulsion | A small piece pulled off where a tendon or ligament attaches |
| Impacted | One fragment driven into the other; the line may look dense instead of dark |
| Translation | Sideways shift of the distal fragment, as a share of shaft width |
| Angulation | Tilt between the fragments, named by apex or by distal-fragment direction |
Common mistakes
- Ordering a single view: an undisplaced fracture may only show on the second view.
- Not imaging the joint above and below a shaft fracture, missing the paired dislocation.
- Mixing up the angulation convention: say whether you mean the apex or the distal fragment.
- Stopping at the first fracture: «satisfaction of search» hides the second injury.
- Calling a clinically suspected fracture «normal» on the first film; some (scaphoid, hip, stress) only show later or on MRI.
- Missing the soft-tissue clues: joint effusion, displaced fat pads, gas in the tissues (an open fracture).
Next step
- Open fracture, absent pulse or a new nerve deficit: urgent orthopaedic call; the film can wait for none of these.
- Fracture through a joint or comminuted: CT helps plan surgery; discuss with orthopaedics.
- Strong clinical suspicion with normal X-ray: immobilize and repeat the X-ray in one to two weeks, or ask for MRI.
- Fracture through abnormal-looking bone or with minimal trauma: ask the radiologist and look for a pathological cause.
- After reduction: a new X-ray in two views to document the position.
Test yourself
Think of the answer, then tap the question to see it.
Why are two views at right angles needed for every suspected fracture?
Because a fracture or its displacement can be invisible on a single view; the second view shows the plane the first one hides.
In which fragment is displacement described by convention?
The distal fragment, relative to the proximal one: translation, angulation, shortening and rotation.
What does a spiral fracture line suggest about the mechanism?
A twisting (rotational) force on the bone.
What should you suspect when a fracture follows minimal trauma through thin or lytic bone?
A pathological fracture (osteoporosis, metastasis, primary bone tumour or infection); it needs further work-up.
Elsewhere in DurgiPedia
Connections
Educational content; it does not replace a radiologist's report and is not a clinical instruction. Each study is ordered on the patient's assessment and your institution's protocols.
Sources: Fracture Healing Overview (StatPearls (NCBI Bookshelf), 2026); Elbow Fractures Overview (StatPearls (NCBI Bookshelf), 2025).
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Representative model, for educational purposes only.