Injury · Ankle
Sprain or break? Only an X-ray can tell you
One wrong step off a curb. Or your mom misses the last stair. The ankle swells. It bruises. It throbs. Sprain or break? From the outside, nobody can say for sure. Here is how it gets sorted out, how long each one takes, and the one step people skip that turns a healed ankle into a "weak ankle."
Photo: Kindel Media / Pexels
Same twist, same swelling, two different injuries
A sprain is a stretched or torn ligament, the strong band that holds the joint together. Most happen when the foot rolls inward and the bands on the outside overstretch.
A fracture is a broken bone. Any of the ankle's three bones can break, or more than one.
The surprise: the surgeons' patient guide says a bad sprain can bring about as much pain, bruising and swelling as a fracture. So looking at it won't settle it. An X-ray does.
Get the ankle checked if:
- you can't put weight on it, or walking is very painful
- it looks bent or out of place
- the foot is numb, tingling or cold
- rest and ice haven't helped, or it isn't better after 5 to 7 days
- it keeps feeling weak or "gives way"
Bone through the skin is an emergency. Go right away, because the open wound raises the risk of infection.
If it's a sprain: rest, ice, wrap, lift
The first 48 hours follow four letters, RICE. Rest: keep weight off the foot. Ice: OrthoInfo suggests 20 to 30 minutes, 3 or 4 times a day, never straight on the skin. Compression: an elastic wrap for support. Elevation: foot above your heart as often as you can.
Sprains come in three grades. Grade 1: stretched, with tiny tears. Grade 2: partly torn, with some pain when walking; a boot or brace may help. Grade 3: torn all the way through; it may need a short leg cast or cast-brace for 10 to 14 days.
A minor sprain heals in about 2 weeks. A serious one takes 6 to 12 weeks.
If it's a break: cast, boot or surgery
If the bone pieces are still lined up, a short leg cast or walking boot often does the job. You may need to keep weight off it for several weeks, with X-rays along the way to check the healing.
Some breaks make the joint unstable. Those need surgery with screws, a plate and screws, or a rod to hold the bones in place.
The timeline: at least 6 weeks for early healing and 10 to 12 weeks for complete healing. Most people are back to normal activities in 3 to 4 months. Full recovery from some fractures can take up to 2 years. Healing can be slower, with more risk of problems such as infection, for people who smoke, have diabetes or are older.
WHERE THIS COMES FROM
Grades, healing times and treatments come from OrthoInfo, the American Academy of Orthopaedic Surgeons' patient site. When-to-call signs come from MedlinePlus (National Library of Medicine). Links at the end.
The step that keeps an ankle steady
When the pain stops, the job isn't done. A sprain needs rehab: range of motion first, then strength, then balance, like standing on the injured foot. After a fracture, it usually starts once the cast or boot comes off, often with a physical therapist.
INSIDER TIP
OrthoInfo says the most common cause of a chronically unstable ankle, the kind that keeps rolling, is not finishing rehab after a sprain. Feeling fine is not the same as being done. Keep going until your clinician or therapist says you can stop.
What therapy involves, and what Medicare pays for it: PT and OT after an injury.
Caring for an older parent? The CDC reports that more than one in four people 65 and older falls each year, yet fewer than half tell their doctor. Falling once doubles the chance of falling again. So after any fall, even one that "didn't hurt much," call the doctor and ask what caused it, not just what it injured.
Questions to ask:
- "Is this a sprain or a fracture, and what did the X-ray show?"
- "What grade is it, or is the break stable? What are the options, and what does each mean for walking and work?"
- "Which exercises should I do at home, and how will I know I'm finished?"
- "Can we talk about what caused the fall and how to lower the risk of another?"
The 60-second recap
- Sprain = ligament. Break = bone. They can look and feel the same, so an X-ray decides.
- Can't bear weight, out of place, numb or cold, or not better in 5 to 7 days: get it checked.
- Sprains heal in 2 to 12 weeks; broken ankles usually 10 to 12 weeks, some longer.
- Finish the exercises. Skipping them is the most common cause of an ankle that keeps giving way.
- For an older parent, tell the doctor about every fall.