Cast Care: Elevation, Neurovascular Checks, and Compartment Syndrome Warning Signs
Teach elevation of the casted limb above heart level for the first 24 to 72 hours, ice over the cast as prescribed, a dry cast, and no objects inside the cast. Check the fingers or toes for color, warmth, movement, and sensation. Pain not relieved by prescribed analgesics, pain with movement of the fingers or toes, numbness, tingling, or pale or blue skin requires emergency care for compartment syndrome.
Who needs this teaching
Clients with a plaster or fiberglass cast after a fracture or orthopedic surgery, and the caregiver. A cast does not expand, so edema inside the cast raises tissue pressure. Acute compartment syndrome occurs when pressure within a muscle compartment compromises circulation. Ischemia lasting 4 to 6 hours causes irreversible muscle and nerve damage.
The priority teaching points
- Elevation and ice. Elevate the casted limb above heart level on pillows for the first 24 to 72 hours to reduce edema. Apply ice in a sealed plastic bag over the cast at the fracture site as prescribed.
- Drying and handling. A plaster cast takes 24 to 72 hours to dry completely. Handle a wet plaster cast with the palms, not the fingertips; indentations create pressure points.
- Keep the cast dry. Cover the cast with a plastic bag or a cast cover for bathing, and keep it out of the water. Never soak or submerge the cast unless the provider confirms a waterproof liner. Moisture softens plaster and causes skin maceration under the cast.
- Skin and itching. Never insert objects such as coat hangers, rulers, or pencils into the cast. Objects break the skin and cause infection. For itching, blow cool air from a hair dryer into the cast. Do not apply powder or lotion inside the cast. Do not pull out the padding. Inspect the skin at the cast edges daily.
- Neurovascular checks. Check the fingers or toes of the casted limb several times a day, and compare them with the other side: color, warmth, capillary refill (normal under 3 seconds), movement, sensation, and swelling. Move the fingers or toes often. Exercise the joints above and below the cast as instructed. Bear weight only as prescribed.
- Compartment syndrome. Early signs are pain out of proportion to the injury, pain not relieved by prescribed analgesics, pain with passive movement of the fingers or toes, and paresthesia (numbness and tingling). Pallor, cool skin, paralysis, and pulselessness are late signs. Any of these signs requires a 911 call or immediate emergency department care.
- Cast problems. Report a foul odor, drainage or staining, a hot spot on the cast surface, or a cracked, soft, or loose cast the same day. A hot spot or foul odor indicates infection or a pressure injury under the cast. Never cut, trim, or remove the cast. Sudden dyspnea or chest pain after a fracture indicates fat embolism or pulmonary embolism; call 911.
Red flags the client reports
| Call the provider the same day | Call 911 or the local emergency number |
|---|---|
| Foul odor or drainage from the cast | Pain not relieved by prescribed analgesics, or pain with movement of the fingers or toes |
| A hot spot on the cast surface | Numbness, tingling, or loss of movement in the fingers or toes |
| A cracked, soft, wet, or loose cast | Pale, blue, gray, or cold fingers or toes |
| Redness or skin breakdown at the cast edges | Sudden shortness of breath or chest pain |
Teach-back questions
- "How will you position your arm for the first 3 days?"
- "Show me how you will check your fingers."
- "What will you do if your skin itches under the cast?"
- "How will you protect the cast when you bathe?"
- "Which kind of pain means you go to the emergency department?"
Teaching tips
- Teach a caregiver to perform the checks for a child or a confused client.
- Write the elevation period and weight-bearing instructions on the handout.
- Stress that pain unrelieved by analgesics is an emergency sign, not a reason to take more medicine.
Read more on NCLEXPace
- Bones and Muscles Map: Fractures, Casts, Traction, and Joint Replacement
- Pressure Injury Staging and the Prevention That Works
Sources
- Harding MM, Kwong J, Hagler D, Reinisch C. Lewis's Medical-Surgical Nursing: Assessment and Management of Clinical Problems. 12th ed. Elsevier; 2023; Chapter: Musculoskeletal Trauma and Orthopedic Surgery.
Why this matters for the NCLEX
Teaching is effective when the client states, "I will keep my arm on pillows above my heart," and "I will go to the emergency department if my pain medicine does not relieve my pain." Statements requiring further teaching include, "I will use a ruler to scratch under my cast," "I will soak in the bathtub with my cast on," and "Numbness in my fingers is normal with a cast."
Frequently asked questions
Does the nurse elevate the limb above the heart when compartment syndrome is suspected?
No. Keep the limb at heart level and do not apply ice. Elevation above the heart reduces arterial flow to the compartment. Notify the provider immediately.
Why does a hot spot on the cast matter?
A warm area on the cast surface indicates infection or a pressure injury beneath it. The client reports it the same day.
More patient teaching on Musculoskeletal / Orthopedics
Osteoporosis: Calcium and Vitamin D, Fall Prevention, and Safe Bisphosphonate UseTeach calcium and vitamin D intake, bone-loading exercise, fall prevention, correct oral bisphosphonate administration, and recognition of fractures and medication adverse effects.After Total Hip Arthroplasty: Hip Precautions, Clot Prevention, and Dislocation Warning SignsTeach hip precautions, adaptive equipment, walker use, venous thromboembolism prevention, incision care, exercise, and recognition of dislocation, infection, and pulmonary embolism.3,200+ NCLEX questions with think-like-a-nurse rationales, unfolding case studies and adaptive readiness exams. Start with free practice questions, then choose a plan when you are ready.
Create Account →