What should you know about ankle plaster cast?

Keep the cast dry, do not place objects inside it, and follow the exact weight-bearing instructions from the treating team. New numbness, discoloured toes, severe pressure or pain that continues to worsen despite elevation can signal a cast problem and needs urgent assessment.

Plaster moulds closely around the leg and ankle, limiting movement so a fracture or selected soft-tissue injury can remain aligned. Padding protects the skin beneath it. A newly applied cast may be split or left partly open to accommodate early swelling, then replaced or completed when swelling settles.

Some casts permit weight through the foot, while others must remain completely unloaded. The injury pattern, stability and cast design determine this; comfort alone does not show that weight bearing is safe. Crutches or another walking aid should be fitted and used as demonstrated.

Elevate the ankle so the toes are above the level of the heart when swelling builds, particularly soon after application. Move the toes regularly if permitted and check their colour, warmth, sensation and ability to move. Keep the cast away from water, sand, powders and lotions, and protect it during washing without immersing it.

Never trim the cast or push a ruler, pen or other object inside to scratch. Report cracks, soft areas, wet padding, a loose fit, rough edges, bad odour, discharge or persistent rubbing. Attend scheduled fracture-clinic checks because repeat examination or imaging may show whether alignment is maintained and when the cast can change or come off.

Seek urgent help if the toes become blue, pale or cold; numbness or pins and needles persists; toe movement becomes difficult; pain rapidly intensifies; or the cast feels increasingly tight despite elevation. These symptoms may reflect impaired circulation, nerve pressure or dangerous swelling.

Prompt review is also needed for burning pain at one spot, fluid or blood soaking through, a foul smell with fever, a cast that becomes wet through, or a cast that breaks and no longer supports the ankle. Do not wait for the next routine visit when these changes appear.

Confirm whether any weight is allowed, which walking aid to use, and how to elevate the limb. Ask whom to contact if the cast gets wet or loose, whether blood-clot prevention is needed for your circumstances, when the next check occurs, and which movements or exercises are appropriate for the knee, toes and unaffected leg.