PLASTER OF PARIS

1. Close reductions and
POP cast applications
SUSHANT S SONARKAR

4. PLASTER OF PARIS
• SEMI HYDRATED CALCIUM SULPHATE
• CaSO4.½H2O +1 ½ H2O = CaSO4.2H20
• Exothermic reaction

6. PLASTER OF PARIS
• COMMERCIAL POP
ROLLS-ROLLS OF
MUSLIN STIFFENED
BY STARCH,POP
POWDER & AN
ACCELERATOR
SUBSTANCE LIKE
ALUM

7. POP- An Ideal Splint
• Cheap, easily available, comfortable
• Easy to mould, quick setting
• Strong & light
• Easy to remove
• Permeable to radiography
• Non-inflammable

8. PLASTER OF PARIS
• 4 forms-
Slab
Cast
Spica
Functional cast brace

9. SLAB
Temporary splint
USES
Initial stages of fracture treatment & during
first aid
Immobilise the limb postoperatively & in
infections
It is made up of half by pop & half by bandage
roll, hence can accommodate the swelling in the
initial stages of fracture

10. CASTS
• Pop roll completely encircles the limb
Definitive form of fracture treatment &
corrects deformities
• 3 methods
 Skin tight cast-cast is directly applied over
the skin. can cause pressure sores. Difficult to
remove as hair may be incorporated into the
cast.

11. Bologna cast-cotton padding is applied to
the limb before putting the cast
Three tier cast-stockinette is used first over
which cotton padding is done before applying
the pop cast.

12. SPICA
• It encircles a part of the body
• Eg: hip spica, thumb spica

13. RULES OF APPLICATION OF POP CASTS

14. RULES OF APPLICATION OF POP CASTS
• Correct size-8 in for thigh, 6 in for leg,
4 in for forearm
• Joint above & joint below should be
included
• Should be moulded with palm & not
with fingers for fear of indentation.

15. • Joint should be immobilized in functional
position.
• Plaster should be just fit & should not be
too tight or too loose.
• Uniform thickness of plaster is preferred.

17. Position of Immobilization
Elbow: 90 degree of flexion
Wrist: 30 degree of extension
Thumb: midway between
maximal radial and palmar
abduction
Hand: intrinsic plus (MCP joints
in at least 70 degree of flexion
and IP joints in extension)

18. Wrist: Moderate
extension (10-
45degree)
MCP joints: Flexion
(70-90 degree)
PIP joints: Neutral

20. Lower limbs
Hip:
10-30 degree of abduction
20-45 degree of flexion
15 degree of external rotation
Knee: 15-30 degree of flexion
Ankle: Neutral dorsiflexion

21. STAGES OF PLASTERING
• Application of pop slab
Cast setting stage-change of pop to gypsum.
Time taken to form a rigid dressing after
contact with water
• Set wet cast
• Cast drying by evaporation of excess water

22. COMPLICATIONS OF POP
Due to tight fit
 Pain
 Pressure sore
 Compartment syndrome
 Peripheral nerve injuries
 Cast syndrome

23. COMPLICATIONS OF POP
• Due to improper application
 Joint stiffness
 Plaster blisters & sores
 Breakage
• Due to plaster allergy
 Allergic dermatitis

24. • Cast disease manifested as muscle atrophy,
osteoporosis, joint stiffness, muscle weakness,
skin breakdown, compartment syndrome,
blister formation.