The skin can only take about 5kg traction in an adult. If more than
this force is required to obtain on maintain a reduction Skeletal
traction must be used. Avoid skeletal traction in children - growth
plates can easily be damaged by skeletal pins.
Indications for Skin Traction
Children
Temporary traction - only a few days e.g. Preoperative
Small force required to maintain reduction <5 kg
Fragile or delicate skin
In the elderly or patients with allergy to Elastoplast (Zinc)
hypoallergenic skin traction bandages are available.
Contraindications to Skin Traction
Force required > 5kg
Skin damage or sepsis in area
Indications Skeletal Traction
Adults requiring > 5kg traction
Skin damage requiring dressings
Long term
Counter Traction
Any force needs an opposing force. If traction pulls a limb distally
the patient will slide downwards towards the pulley, and the traction
will not be effective. Provide an opposing force by raising the
foot of the bed on blocks. By sloping the bed in the other
direction the tendency to slide will be opposed. In Cervical traction
the front end of the bed needs raising, and with Dunlop traction
the side of the bed near the injury needs elevation.
Multiple Pulley Systems
In many situations multiple pulleys are used, so that less weights
are necessary. Multiple pulleys are commonly used in pelvic traction
where high forces (commonly up to 40 kg) may be needed.
Multiple pulleys decrease the force needed at
the end rope
If a triple and double block were used as in the picture only 40/5
or 8 kg. would be required to generate the 40 kg. lift needed.