Fractures, Splints and Casts
Pain is the first warning sign
General information from an emergency physician. It adds to your discharge papers and does not replace them or your own doctor. What this site is and isn’t
Key Takeaways:
- Pain that is out of proportion (or pain that prescribed medicine should control but does not) means return immediately. Dangerous pressure can permanently damage muscle and nerve within 6 to 10 hours.
- Normal color, warmth, or pulse does not rule out dangerous pressure.
- Never push anything inside a cast to scratch. Use cool air from a hairdryer instead.
About Your Diagnosis and ED Workup
A broken bone rebuilds itself in stages. A soft bridge forms, becomes hard bone, and then reshapes for months or years. The limb may feel better while the bridge is still weak. Keep the device on until the fracture, not the pain, shows it is ready.
A splint does not wrap all the way around. It leaves room for swelling during the first days and can be opened to check the limb. A hard cast holds more firmly but leaves less room for swelling. This is why a splint often comes first and a cast later.
For a child: A soft bandage or removable splint may be enough for a simple buckle fracture. These wrist fractures healed in 3 to 4 weeks with either approach. Follow the child’s exact plan.
First Steps and Evidence-Based Home Care
Keep the limb above heart level, especially for the first 48 hours. Elevation, ice, and gentle, non-tight compression reduce pain and swelling. Nothing wrapped around the limb should feel snug.
Holding the bone still also treats pain. For a stable break that did not move, medicine is usually taken only as needed. For a displaced or reset break, follow the scheduled medicine plan you were given for the first few days.
For itching, direct cool air from a hairdryer into the cast. Never push anything underneath.
Keep the device dry. Water trapped under plaster or cotton lining can damage skin and allow infection. Cover it for showers or use sponge baths. Dry a small wet spot with cool or low air only, never high heat. A soaked cast may need replacement. Even waterproof casts should stay out of lakes, oceans, and sand.
Do not remove the device or test the limb because pain has stopped. Pain often ends before the bone is strong.
Timeline and Expected Recovery Course
- About 2 to 3 weeks: A soft bridge forms. The limb may hurt much less, but it is not strong yet.
- About 6 to 12 weeks: The bridge becomes hard bone. Timing depends on which bone broke.
- Months to years: The bone continues reshaping.
Device time and weight-bearing depend on the bone, stability, and whether it was reset or repaired. Do not test the limb on your own. Healing may be delayed, especially with older age, thin bones, or diabetes.
Emergency Red Flags: Return Immediately
Swelling under a tight device can cut blood flow to muscles and nerves. Permanent damage can happen within 6 to 10 hours.
Return to the emergency department immediately for:
- Pain out of proportion, worsening pain, or pain the prescribed medicine should control but does not. This is often the earliest warning.
- Severe pain when someone gently straightens the fingers or toes.
- New numbness or tingling, or a tense, full, unusually firm limb.
- Pale skin, a cold limb, no pulse, or fingers or toes you cannot move. These are late signs.
Do not cut off your own cast. Even if loosening a wrap helps, return immediately. Normal color, warmth, or pulse does not rule out dangerous pressure.
For a child who cannot describe pain: Watch for increasing agitation, increasing anxiety, and needing more pain medicine than the injury seems to explain.
If diabetes has caused nerve damage, pain may not warn you. Have a concerning cast checked the same day.
Reviewed August 27, 2026