Circular casts for fractures: care and warning signs

A circular, or complete, cast wraps all the way around the limb. Its rigid shell limits movement so the broken bone can remain in the position chosen by the fracture team. Padding beneath the shell protects the skin and allows some accommodation for normal contours.

Plaster and fibreglass are common cast materials. A temporary splint may be preferred while early swelling is changing because it is not fully closed around the limb. Some displaced fractures need realignment before casting, while unstable or open injuries may require an operation instead.

Keep the cast dry unless the fracture service specifically says its materials are water-safe. Do not push objects, powders or creams inside, trim the edges or alter the shell yourself. Move exposed fingers or toes as instructed and elevate the limb during early swelling.

Follow the stated weight-bearing restriction; a walking aid or cast shoe does not automatically mean full weight is allowed. Check the cast each day for cracks, soft spots, wet padding, bad odour or rubbing. Attend imaging and cast appointments because bone position and fit may change as swelling settles.

Seek urgent assessment for increasing pain that is not controlled as advised, a cast that feels progressively tighter, new numbness, inability to move exposed digits, or fingers or toes that become pale, blue or unusually cold. Also report burning, persistent wetness, drainage, fever, a foul smell, a broken cast or the feeling that the limb is moving excessively inside it. Do not cut off a cast at home unless emergency professionals explicitly direct you.

Ask whether you may put weight through the limb, how to bathe safely, which joints should keep moving, when the cast will be checked, and whom to call if it loosens. Confirm whether physiotherapy is likely after removal and whether driving, work or sport restrictions apply.