Principles of Casting - AADOaado.org/file/nurse_cast-ws_nov13/Dr KB Lee.pdfBasic Principles of...
Transcript of Principles of Casting - AADOaado.org/file/nurse_cast-ws_nov13/Dr KB Lee.pdfBasic Principles of...
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Principles of Casting Trauma Management with Cast Application
AADO Dr K B Lee
Queen Elizabeth Hospital
3 Nov 2013
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Introduction
Basic Principles of Fracture Treatment:
Reduce (Reduction)
Hold (Immobilization) Plaster Cast
Exercise (Rehabilitation)
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Different Types of Plaster
•Plaster Bandage: Plaster of Paris (POP)
•Resin Bandage
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Plaster of Paris (POP)
Early use in Paris area to make building plaster and cement
Gypsum (calcium sulphate dihydrate) Chemical formula: amorphous anhydride calcium
sulphate ( CaSO4.2H20) Dissolves in water, on drying, exothermic
reaction to form a solid mass Impregnating fabric materials with gypsum to
make plaster bandage
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Synthetic Resin Bandage
Synthetic material (Fabric + resins)
eg. Dynacast :
glass fiber fabric + polyurethane resin
Activation for the resin polymerization
Usually water
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POP Synthetic Resin
Advantages Inexpensive Shorter setting time
Good molding
capacity
More radiolucent
Long storage time Lighter
Easy to handle Stronger
Water resistant
Better ventilation
Advantages
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POP Synthetic Resin
Disadvantages Weaker than
synthetic material
Less molding
capacity
Heavy Expensive
Non-water
resistance
Adheres to
clothing
Radiolucency fair Sticky when
applying
Disadvantages
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Choice of Material
Molding Weight Bearing Weight Radiolucency
Resin Bandage is not a superior material
Ideal Bandage –
easily applicable, able to set rapidly, and conforming to the injured limb
Use appropriate size bandage in different region-
4” hand & forearm, 6” leg, 8” thigh
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CR + POP
What does it mean ?
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Principles Behinds “CR + POP”
Manipulation of the fracture to improve the position of the fragments Should not be delayed
Swelling of the soft part during the first 12 hours makes reduction increasingly difficult
Under appropriate anaesthesia / muscle relaxation / sedation / intra-haematoma block
Manoeuvre : Traction: distal part of the limb is pulled in line of the bone As the fragments disengaged, they are repositioned ( by reversing the original
direction of force ) Alignment is adjusted in each plane
Immobilization with “3-points fixation” Casting
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Soft Tissue Hinge
Interlocking
Increasing the initial deformity
release the interlocking
without excessive traction
Fragments repositioned by
reversing the deforming force
Reduction maintained by the soft
tissue hinge (ligamentotaxis)
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Molding 3 Points Fixation: •A third force to neutralise the couple and
the system becomes stable
•It takes a curved cast to produce a
straight bone
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Basic Steps for Plaster Application Reduction of fracture
Padding
Tubegauze / stockinette
Velban application
Plaster application
Molding
Trimming & reinforcement
Removal
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Closed Reduction of Colles’ Fracture
Continuous traction with counter-traction
Dis-impaction & Manipulation
Reduce dorsal angulation:
wrist flexion 20° to 30°
Correct radial deviation:
wrist ulnar derivation 10°
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Extending to the joint above & longer than the limb for easy handling of the extremity
Padding –
Stockinette
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Padding – Velban
Smooth and even Overlapping 50% Thin layer is enough,
otherwise would affect the fit & holding ability of the cast
Thicker at bony prominences
Control swelling
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Plaster Bandage Activation
Lifted with dry hands
Thorough immersion in water at room temperature
Water gently squeezed out until no more bubbles
Remove from water and further squeeze out excessive water
at 30° angle to allow air bubbles to escape
Roll out 10-20cm POP bandage before
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Smoothly and evenly applied
Continuous folds to cover at least half of previous fold
Smooth out every layer to remove air
Figure of 8 when crossing joint, prevent in-folding of plaster causing sore
Plaster Application
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Plaster Application
Cutting out or out-folding the angles of POP slab to avoid pressure point at corner
Stockinette fold back at the end to make the edge smooth
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Molding
To fit external anatomy of the limb & create 3-point fixation
Start during application
Continuous & Dynamic
Use palms and thenar eminences (NOT fingers)
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Molding
What are they doing ?
A) 3-point fixation for better stability
B) Better contouring of the cast
C) Facilitate rehabilitation
D) All of the above
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Molding
3-point fixation for distal radius fracture
Oblong shape to maintain palmer arch
Molding of forearm to stretch
interosseous membrane
Excluding the 5th finger from
the grip to allow the ample
accommodation for the
transverse palmar arch
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Trimming
Allow unobstructed motion for joints not needed to be immobilized
Prevent impingement sore
For short arm POP for distal radius #: POP extends from knuckles & palmer crease to below elbow check free motion of elbow, thumb, little finger, & MCPJs
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Check Before Trim
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Trimming
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Reinforcement
Adding slab
Hybrid casting: POP for better molding inside, synthetic cast outside for strength & reduced weight
Ridging
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For Wound Inspection
Making a hump with thick gauze over the wound site for opening of window
Cut out the hump after POP set
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Other Types of Casting
¾ Slab for distal radius
U-slab for humerus
Sarmiento cast for tibia
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Cast Removal
Initial bivalving at diametrically opposite points on the circumference
Cutting should not pass bony prominence
Oscillating electric plaster saw or plaster shears
Spreader, bender
Immerse POP in water, peel out after softened
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Basic Equipment
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Electric Saw
vibrates at low amplitude
cuts off stiff material but not skin
only used on dry and padded plaster
stepping without dragging
the blade can become very hot
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Electric Saw
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Spreader
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Always split on
the cancave side
Do NOT split plaster
on the Convex side
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Plaster Shears
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Complications of Plastering
Circulatory disturbance Nerves compression Pressure sore Edema swelling Allergy Deep burn Saw injury or heat burn on removal Joint stiffness after prolonged immobilization
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Poor Manipulation & Reduction
Insufficient relaxation
Inadequate reduction
Poor understanding of fracture mechanics
Fail to lock # after reduction
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Pitfalls in Plastering
Poor plaster technique will end up with:
Too tight Neurovascular compromise / compartment syndrome
Excessive padding / Edema subsided loosening
Poor application across joint joint buckling
Lamination of plaster air trapped weaken the cast
Poor molding failed immobilization / impingement
Poor trimming sharp edges / impingement sore
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What problem ?
A Poor molding causing
impingement
C Dynacast should be used
B Cast too thick
D All of the above
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Poor Molding
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What problem ?
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Don’t leave your signature on the cast
Poor Handling
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What problem ?
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Buckling Figure of 8
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Pressure Sore
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How to detect pressure sore inside a cast?
A Burning sensation
C Fluid stained plaster
B Offensive smell
D All of the above
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Clues of Plaster Sore
Itching & burning sensation
Fever, sleep disturbance & fretfulness
An area of local heat on the plaster
Offensive smell or discharge
Fluid-stained plaster
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Prevention of Pressure Sore
Good padding
Proper application of plaster esp over bony prominence & crossing joint
Out-folding of POP slab to avoid pressure point at corner
Smooth molding
Trimming
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Plaster Burn
Heat generated during the setting can cause burn,especially if patient is unconscious, who cannot C/O hot to you! )
Lower limb long leg POP need more layers for strength more exothermic reaction
Suggest to use pre-fabricated splint or synthetic cast for LL
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Allergy
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Follow Up Care
Frequency & timing Check POP fitness Detect complications
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Case 1: What is the first thing to do?
A CR + POP
C Remove the ring
B Book OT for ORIF
D Find relative for consent
for sedation
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Case 2: What happen & What to do?
A UL Elevation
C Loosening the plaster
B Finger mobilization
D All are correct
Distal swelling
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Case 3: What happen & What to do?
16 hrs after POP,
develop finger
numbness and pain
1. Split all layers of cast, down to skin,
throughout the whole length of cast
2. Emergency fasciotomy if clinical suspicious
Compartment Syndrome
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Incomplete Slab – for Acute Cases with Gross Swelling
Use ¾ Dorsal Slab rather than complete casting for initial treatment of distal radial fracture to prevent over tightening of cast
Reduce the risk of distal edema / compartment syndrome
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Always Remember the Basis &
Precautions to Make a Good Cast
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The End
Thank You