What is the term for a firm covering immobilizing a broken bone during healing?

• A. Bandage
• B. Splint
• C. Cast
• D. Sling

Answer: (C)

A cast is a rigid outer covering that immobilizes a broken bone during healing by encasing the limb and keeping the fracture ends from moving. This rigid encasement—usually made of plaster or fiberglass—stops movement at the injury site, which is essential for proper alignment and healing. A bandage is a soft wrap used for dressings, not for immobilizing a fracture. A sling mainly supports the arm and doesn’t immobilize the leg or the entire injured limb. A splint can immobilize, but it’s typically a temporary rigid support placed on the limb rather than a long-term covering that encases the bone. In CNA practice, you’d monitor the cast area for circulation and skin problems, keep it dry, avoid putting objects inside, and report signs like increasing pain, numbness, swelling, or color changes.