Invacare Adjustable Back Upholstery - Manuel (Page 5)

Part No 1039470 5 Adjustable Tension Back Upholstery
When using adjustable upholstery, it is possible to tighten the lower portion of the
backrest which assists in maintaining a neutral pelvis. The upper portion can then be
adjusted to follow the natural curvature of the spine bringing the trunk back over the
pelvis in a position of balance relative to the center of gravity (Detail “A” ‐ FIGURE 4).
The best point of control for the pelvis is near the Posterior Superior Iliac Spine (P.S.I.S).
The upper trunk should be relined until a balance posture is achieved, approximately 10
to 15 degrees (Detail “B” ‐ FIGURE 4).
For individuals who have fixed kyphotic spine, the backrest can be adjusted to allow for
an increased recline while providing increased contact and support of the back (Detail
“C” ‐ FIGURE 4).
The height of the backrest and the amount of control provided by the adjustable tension
upholstery will vary depending on the abilities of the user. An active paraplegic (SCI) may
require a minimal back height which adds posterior stability to the pelvis and lets the
trunk assume a natural balance over the top edge of the wheelchair upholstery. A less
active para (with a high level of injury) or a quadriplegic may require a higher backrest
with an increased level of recline (Detail “D” ‐ FIGURE 4).
The effect of back support and the angle of the backrest are interconnected. Changes to
one often requires change to the other if optimal support and balance are to be achieved.
Use of a wheelchair with adjustable tension upholstery can significantly increase
function, postural control, balance and comfort.
FIGURE 4
DETAIL “A” DETAIL “B”
DETAIL “C” DETAIL “D”
10-15°
Angle
P.S.I.S.
Adjust Backrest to
conform to Fixed
Kyphotic
Deformity
Open seat to
back angle, if
possible
Para Quad