Sprained Ankle in a Child: Sprain or Fracture?

Why 'just a sprain' is less certain in children

In adults, ligaments are often the weakest link in the ankle, so twisting injuries commonly cause ligament sprains. In growing children, the growth plates — active areas of cartilage at the ends of the bones that guide bone growth — are structurally softer than the ligaments 1Ref 1Boutis K (2016).Pediatric Ankle Fractures: Concepts and Treatment Principles.In children, growth plates are structurally weaker than surrounding ligaments, making growth plate fractures common where adults would sprain; growth plate fractures typically require 3-6 weeks of immobilization to ensure correct healing. This means a similar twisting force that would sprain an adult's ankle may instead cause a fracture through a child's growth plate.

Growth plate fractures of the distal fibula (the small bump on the outside of the ankle) are among the most common fractures in older children and adolescents — and they often look exactly like a sprain on the outside. The growth plate on the inside of the ankle is also vulnerable.

This is why pediatric providers are more likely to obtain X-rays for ankle injuries in children and adolescents than an adult presenting with the same mechanism.

Signs that suggest a fracture rather than a sprain

Clinical decision tools — including the Ottawa Ankle Rules, which have been validated in pediatric patients 2Ref 2de Carvalho MO, Marcolino HM, Daleffe MR (2025).Ottawa Ankle Rules: A Reliable Clinical Instrument to Detect Fractures in Children and Adolescents.Prospective study in 144 children aged 16 or younger: Ottawa Ankle Rules achieved 100% sensitivity and negative predictive value for fracture detection; inability to bear weight was the most sensitive single criterion; applying the rules could reduce radiograph requests by ~44%3Ref 3Clark KD, Tanner S (2003).Evaluation of the Ottawa Ankle Rules in Children.Among 195 children (mean age 12.6 years), 40 fractures (21%) were identified; inability to bear weight immediately and inability to take four steps were among the best fracture predictors; the standard Ottawa Ankle Rules had 83% sensitivity in children, highlighting that pediatric ankle injuries often require X-ray even when adults would not — help providers determine when X-ray is needed. The following features, which parents can observe, suggest a fracture is more likely:

• Cannot bear any weight — the child refuses to walk at all on the injured foot, or takes only a step or two before stopping due to pain 2Ref 2de Carvalho MO, Marcolino HM, Daleffe MR (2025).Ottawa Ankle Rules: A Reliable Clinical Instrument to Detect Fractures in Children and Adolescents.Prospective study in 144 children aged 16 or younger: Ottawa Ankle Rules achieved 100% sensitivity and negative predictive value for fracture detection; inability to bear weight was the most sensitive single criterion; applying the rules could reduce radiograph requests by ~44%3Ref 3Clark KD, Tanner S (2003).Evaluation of the Ottawa Ankle Rules in Children.Among 195 children (mean age 12.6 years), 40 fractures (21%) were identified; inability to bear weight immediately and inability to take four steps were among the best fracture predictors; the standard Ottawa Ankle Rules had 83% sensitivity in children, highlighting that pediatric ankle injuries often require X-ray even when adults would not
• Point tenderness over the bone — pressing directly on the bony bump on the outside or inside of the ankle reproduces sharp pain (as opposed to tenderness in the soft tissue above or in front)
• Significant swelling that develops rapidly — substantial swelling in the first 30 minutes is more consistent with a bony injury than a ligament sprain
• Mechanism involved significant force — a fall from height, a sports collision, or a high-speed twist

A child who can bear weight and has tenderness only in the ligaments (soft tissue in front of or below the bony bumps) may have a sprain, but in a growing child an X-ray is still often the safest approach to confirm.

Initial home care for an ankle injury

While deciding whether to seek care, or on the way:

• Rest — keep weight off the ankle
• Ice — a cold pack (wrapped in cloth, not directly on skin) applied for 15–20 minutes at a time helps with swelling and pain
• Elevation — raising the ankle above heart level (propped on pillows) helps limit swelling
• Do not have the child push through pain to walk — if they cannot bear weight, support them and seek evaluation

For confirmed minor sprains, the RICE approach (Rest, Ice, Compression, Elevation) is standard initial management. A provider can recommend appropriate wrapping and whether a brace or crutches are helpful. Complete rest is usually not required — gentle range-of-motion and gradual return to activity under guidance speeds recovery.

Sprains in children generally heal well. Growth plate fractures often heal well too, but typically require immobilization (a boot or cast) to ensure the growth plate heals correctly and bone growth is not affected.

Recovery and return to activity

Most ankle sprains in children recover in one to four weeks. A growth plate fracture typically requires three to six weeks of immobilization 1Ref 1Boutis K (2016).Pediatric Ankle Fractures: Concepts and Treatment Principles.In children, growth plates are structurally weaker than surrounding ligaments, making growth plate fractures common where adults would sprain; growth plate fractures typically require 3-6 weeks of immobilization to ensure correct healing. Some questions parents often have about return to sports:

• A child should be able to walk without pain before beginning a return to running
• Running without pain should be established before return to jumping, cutting, and pivoting
• Return to competitive sports after a significant ankle injury benefits from gradual progression and, in some cases, physical therapy to restore balance and strength

A chronic ankle sprain that keeps recurring, or an ankle that remains swollen and painful after several weeks, warrants further evaluation — some children have underlying instability or a missed fracture.