Cast Application and Removal Dr. Abdulrahman Algarni, MD, SSC (Ortho), ABOS Assist. Professor, King Saud University Consultant Orthopedic and Arthroplasty.

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Presentation transcript:

Cast Application and Removal Dr. Abdulrahman Algarni, MD, SSC (Ortho), ABOS Assist. Professor, King Saud University Consultant Orthopedic and Arthroplasty Surgeon

Introduction Approach to casting and splinting requires a thorough assessment of the injured extremity for proper diagnosis. Examine the skin, neurovascular status (before and after cast application or splinting), soft tissues, and bony structures.

Indication for immobilization Fractures Sprains Severe soft tissue injuries Reduced joint dislocations Deep laceration repairs across joints Tendon laceration Inflammatory conditions: tendinopathy, tenosynovitis

Materials and Equipment stockinette (2-3 inches for upper limb, 4 inches for lower limb) Sheets, under pads (to minimize soiling of the patient's clothing) Padding (soft rolls) Casting Material

Plaster of Paris(POP) Gypsum is the precursor of P.O.P known as calcium sulphate dihydrate. Gypsum + heat = P.O.P + water Fiberglass Cast A polymer resin cast

Casting Material Plaster of Paris(POP) Lower cost Better moulding Fiberglass Cast Stronger and Lighter Rapid setting (5-10 min) Maximum strength in 30 min Water resistant Radiolucent

Casting Material The most important variable affecting the setting time for POP is water temperature. The faster the material sets, the greater the heat produced, and the greater the risk of significant skin burns. Heat is inversely proportional to the setting time and directly proportional to the number of layers used.

Casting Material Factors that speed setting time Warm water Soft water Fiber glass cast use Accelerator use: potassium sulfate Reuse of dipping water Factors that slow sitting time Cold water Hard water Plaster of Paris (POP) Retarder use: sodium borate

Materials and Equipment Elastic bandage (for splints) Non-sterilized gloves (necessary for fiberglass) Basin of water at room temperature (dipping water) Bandage scissors Adhesive tape

Application Principles You should carefully inspect the involved extremity and document skin lesions & soft tissue injuries. You should carefully assess neurovascular status before splint or cast application. Following immobilization, neurovascular status should be rechecked and documented.

Application Principles Pay attention to the patient comfort status and pain level; never re-align a fracture without adequate analgesia. The patient's clothing should also be covered with sheets to protect it and the surrounding area from being soiled by water and plaster or fiberglass.

Types and Techniques A. Complete cast: Measure the length. The physician hold the limb reduced and the assistant apply stockinette. Stockinette; 10 cm longer than the required length, therefore can be folded. Soft roll application; in the same position the limb will be immobilized, 2 layers, avoid folds at joint line and do an extra padding at bony prominence. Assistant immerses P.O.P in warm water until all air bubble within the bandage disappears.

Types and Techniques A. Complete cast: Squeeze the bandage to expel excess water. P.O.P applied around the limb with gentle firmness, each circle should overlap about half the width. The plaster should be smoothed and molded Limb should be elevated and iced in the first 48hrs to decrease the swelling

General Rules for Cast Fixation Immobilize the joint above and below the fracture Try not to immobilize any joint unnecessarily Immobilize the joint in functional position whenever possible; e.g. knee degree flexion, elbow 90 degree flexion, ankle and wrist are neutral At the wrist stop just proximal to the distal palmer crease, to keep meta- carpophalangeal joint free

General Rules for Cast Fixation Proximally: A. Below elbow: two finger width distal to the elbow crease B. Above elbow: just below deltoid insertion For the foot; distally keep all the toes exposed Proximally: A. Below knee: Just below the tibial tuberosity B. Above knee: upper third of the thigh

Types and Techniques B. Plaster slab Measure the length. The physician hold the limb reduced and the assistant apply stockinet. Stockinette; 10 cm longer than the required length, therefore can be folded. Soft roll application; in the same position the limb will be immobilized, avoid folds at joint line and extra padding at bony prominence. A longitudinal piece of plaster prepared to the required length, folded in 10 layers.

Types and Techniques B. Plaster slab Assistant immerses P.O.P in warm water until all air bubble within the bandage disappears. Squeeze the bandage to expel excess water. Apply dorsally and hold by gauze bandage. Limb should be elevated and iced in the first 48hrs to decrease the swelling

Advantages/Disadvantages of Cast Advantages of cast More effective immobilization compare to slab Disadvantages of cast More time and skills needed to apply More complication compared to slab Stiffness of immobilized joints Pressure problems

Advantages/ Disadvantages of Slab Advantages of slab Faster and easier to apply Because a splint is non- circumferential, it allows for the natural swelling that occurs during the initial inflammatory phase of the injury A splint may be removed more easily than a cast, allowing for regular inspection of the injury site Disadvantages of slab Lack of patient compliance Excessive motion at the injury site

Complication of Cast Application Compartment syndrome Ischemia Heat injury Pressure sores and skin breakdown Infection Dermatitis Joint stiffness Neurologic injury

Cast Instructions should be provided to the patient Keep limb elevated especially the first 48hrs. Move fingers/toes. Exercise all joints not included in the cast. If fingers/toes become swollen, painful or stiff raise the limb, apply ice and move the fingers/toes. If no improvement; return to the hospital immediately. If the cast becomes loose or cracked report to hospital.

Removal of Cast Indication for splitting or removal of cast Swelling of toes/fingers without ischemia  split the cast. Swelling of toes/fingers with sign of ischemia/compartment syndrome  remove the cast and all compressive dressing down to skin.