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A cast holds a broken bone in place as it heals. Casts also help to prevent or decrease muscle contractions, and are effective at providing immobilization, especially after surgery.
Casts immobilize the joint above and the joint below the area that is to be kept straight and without motion. For example, a child with a forearm fracture will have a long arm cast to immobilize the wrist and elbow joints.
The outside, or hard part of the cast, is made from two different kinds of casting materials.
Plaster (white in color)
Fiberglass (comes in a variety of colors, patterns, and designs)
Cotton and other synthetic materials are used to line the inside of the cast to make it soft and to provide padding around bony areas, such as the wrist or elbow.
Special waterproof cast liners may be used under a fiberglass cast, allowing the child to get the cast wet. Consult your child's doctor for special cast care instructions for this type of cast.
Below is a description of the various types of casts, the location of the body they are applied, and their general function.
Type of cast
Short arm cast
Applied below the elbow to the hand.
Forearm or wrist fractures. Also used to hold the forearm or wrist muscles and tendons in place after surgery.
Long arm cast
Applied from the upper arm to the hand.
Upper arm, elbow, or forearm fractures. Also used to hold the arm or elbow muscles and tendons in place after surgery.
Arm cylinder cast
Applied from the upper arm to the wrist.
To hold the elbow muscles and tendons in place after a dislocation or surgery.
Shoulder spica cast
Applied around the trunk of the body to the shoulder, arm, and hand.
Shoulder dislocations or after surgery on the shoulder area.
Applied around the neck and trunk of the body.
After surgery on the neck or upper back area.
Short leg cast
Applied to the area below the knee to the foot.
Lower leg fractures, severe ankle sprains/strains, or fractures. Also used to hold the leg or foot muscles and tendons in place after surgery to allow healing.
Leg cylinder cast
Applied from the upper thigh to the ankle.
Knee, or lower leg fractures, knee dislocations, or after surgery on the leg or knee area.
Unilateral hip spica cast
Applied from the chest to the foot on one leg.
Thigh fractures. Also used to hold the hip or thigh muscles and tendons in place after surgery to allow healing.
One and one-half hip spica cast
Applied from the chest to the foot on one leg to the knee of the other leg. A bar is placed between both legs to keep the hips and legs immobilized.
Thigh fracture. Also used to hold the hip or thigh muscles and tendons in place after surgery to allow healing.
Bilateral long leg hip spica cast
Applied from the chest to the feet. A bar is placed between both legs to keep the hips and legs immobilized.
Pelvis, hip, or thigh fractures. Also used to hold the hip or thigh muscles and tendons in place after surgery to allow healing.
Short leg hip spica cast
Applied from the chest to the thighs or knees.
To hold the hip muscles and tendons in place after surgery to allow healing.
Abduction boot cast
Applied from the upper thighs to the feet. A bar is placed between both legs to keep the hips and legs immobilized.
Assistive devices for children with casts include:
Keep the cast clean and dry.
Check for cracks or breaks in the cast.
Rough edges can be padded to protect the skin from scratches.
Do not scratch the skin under the cast by inserting objects inside the cast.
Can use a hairdryer placed on a cool setting to blow air under the cast and cool down the hot, itchy skin. Never blow warm or hot air into the cast.
Do not put powders or lotion inside the cast.
Cover the cast while your child is eating to prevent food spills and crumbs from entering the cast.
Prevent small toys or objects from being put inside the cast.
Elevate the cast above the level of the heart to decrease swelling.
Encourage your child to move his or her fingers or toes to promote circulation.
Do not use the abduction bar on the cast to lift or carry the child.
Older children with body casts may need to use a bedpan or urinal in order to go to the bathroom. Tips to keep body casts clean and dry and prevent skin irritation around the genital area include the following:
Use a diaper or sanitary napkin around the genital area to prevent leakage or splashing of urine.
Place toilet paper inside the bedpan to prevent urine from splashing onto the cast or bed.
Keep the genital area as clean and dry as possible to prevent skin irritation.
Contact your child's doctor or healthcare provider if your child develops one or more of the following symptoms:
Fever as directed by your healthcare provider or: • Your child is younger than 12 weeks and has a fever of 100.4°F (38°C) or higher because your baby may need to be seen by their healthcare provider. • Your child has repeated fevers above 104°F (40°C) at any age. • Your child is younger than 2 years old and their fever continues for more than 24 hours or your child is 2 years old and older and their fever continues for more than 3 day
Increased swelling above or below the cast
Decreased ability to move extremity in the cast
Complaints of numbness or tingling
Drainage or foul odor from the cast
Cool or cold fingers or toes
If the cast becomes wet or soiled
Blister, sores, or rash develop under the cast
Bayhealth is Southern Delaware’s healthcare leader with hospitals in Dover and in Milford. Bayhealth provides a wide range of medical services, including cardiovascular, cancer, orthopaedics and rehabilitation, pediatrics, respiratory care, sleep care, surgical weight loss and women’s services.