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Plaster Cast – Uses, Types & Healing

A plaster cast is a rigid supportive bandage used to immobilize broken bones or injured joints, keeping them in the correct position to promote proper healing.

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Things worth knowing about "Plaster Cast"

A plaster cast is a rigid supportive bandage used to immobilize broken bones or injured joints, keeping them in the correct position to promote proper healing.

What Is a Plaster Cast?

A plaster cast (also called a cast or casting) is a hard shell applied around a body part to immobilize it after an injury – most commonly a broken bone (fracture) or a severely injured joint. Traditionally made from plaster of Paris bandages that harden when wet, modern casts are often made from lightweight fiberglass or other synthetic materials. The cast holds bones and tissues in the correct position while the body heals.

When Is a Cast Used?

Casts are widely used in orthopedics and trauma surgery for a range of conditions:

Bone fractures: Immobilizing broken bones so they can heal in proper alignment.
Severe sprains and ligament tears: Protecting and resting injured joints.
Post-surgery stabilization: Supporting bones and joints after surgical repair.
Congenital deformities: For example, treating clubfoot in newborns using the Ponseti method.
Tendon injuries: Protecting repaired or ruptured tendons.

Types of Casts

Circumferential (Full) Cast

A full cast completely encircles the injured body part, providing maximum immobilization. It is typically used once initial swelling has subsided and the fracture is stable.

Splint (Half Cast)

A splint covers only one side of the limb and is held in place with bandages. It is often used in the acute phase of injury, as it accommodates swelling and reduces the risk of the cast becoming too tight, which could lead to a dangerous condition called compartment syndrome.

Fiberglass Cast

Fiberglass casts are lighter, more durable, and more water-resistant than traditional plaster casts. They provide comparable stability and are commonly preferred in modern clinical practice.

Walking Cast

A walking cast is reinforced at the bottom to allow the patient to bear weight and walk while the foot or lower leg remains immobilized.

How Is a Cast Applied?

A cast is applied by trained medical professionals. First, the injured area is padded with cotton or foam to prevent pressure sores. Wet plaster or fiberglass bandages are then wrapped in multiple layers around the limb, which is held in the desired position until the material hardens. Traditional plaster takes 24 to 72 hours to fully harden, while fiberglass sets much faster.

How Long Is a Cast Worn?

The duration of cast treatment depends on the type and severity of the injury as well as the age of the patient:

Simple fractures: typically 4 to 6 weeks
Complex fractures: up to 12 weeks or longer
Children: generally heal faster than adults

Possible Complications

Although casts are a well-established treatment, complications can occur:

Pressure sores: caused by a cast that is too tight or poorly padded
Compartment syndrome: a dangerous rise in pressure within the muscle compartment due to a cast that is too tight – a medical emergency requiring immediate attention
Muscle atrophy: muscle weakness and wasting due to prolonged immobilization
Deep vein thrombosis (DVT): increased risk of blood clots, especially with leg casts
Skin irritation and itching: beneath the cast
Allergic reactions: rare, to cast materials

Important Tips for Patients

Patients wearing a cast should follow these guidelines:

Keep the cast dry – traditional plaster casts must not get wet.
Do not insert objects under the cast, as this can cause skin injuries and infection.
Seek immediate medical attention if you experience severe pain, numbness, tingling, skin discoloration of the fingers or toes, or increasing pressure under the cast.
Do not attempt to remove or cut the cast yourself.
After the cast is removed, attend physiotherapy to restore strength and range of motion.

Casts in Children

Casts are frequently used in pediatric patients because children tend to break bones more easily during growth – but they also heal faster. Specific childhood fractures, such as greenstick fractures (incomplete breaks in the still-flexible bone of a child), are often managed conservatively with a cast. Congenital deformities such as clubfoot can be corrected in newborns through a series of progressive casts using the Ponseti method.

References

Buckley, R. E., Moran, C. G., Apivatthakakul, T. (Eds.): AO Principles of Fracture Management. Thieme Verlag, Stuttgart, 3rd Edition, 2017.
Dandy, D. J., Edwards, D. J.: Essential Orthopaedics and Trauma. Churchill Livingstone, Edinburgh, 5th Edition, 2009.
National Health Service (NHS): Plaster Casts – Overview. www.nhs.uk, accessed 2024.

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