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• G - Measure from acromion process to acromion process– End of scapula to end of scapula
(shoulder blade)– Determines placement of
attachment points for an anterior trunk support
ON A CHAIR:To determine upholstery width and placement of anterior trunk support
straps
Shoulder Width - G
Acromion Processes
• J - Measure width of trunk at appropriate height for the lateral supports– Use offset hardware if J is less
than A– Consider thickness of lateral
pads when choosing hardwareON A CHAIR:Use measurement for lateral
thoracicpad placement. Add 1”.
Trunk Width - J
Seat Width - A• Measure the widest part of the
seated anatomy– Hips, thighs or knees
ON A CHAIR: keep same for active, full time users, add 1” for clients that are growing or expected to gain weight
Foot Length/Width - D • D1 - Measure length of foot
– Used to determine footplate length – Consider typical footwear
• D2 - Measure width of both feet – Used to determine width needed – Typical footwear– Orthotics or prosthetics worn in chair– Tapered front endsON A CHAIR:Make sure, if ordering rigid chair with
inset,that frame width is wider than D2
Back Heights F
Add the cushion thickness to
achieve height needed.
F - Measure from seat surface to the top of the shoulders. Required for passive users and those using tilt in space chairs.
Seat Depth - B• Measure from the client’s most
posterior aspect to the back of the knee
• Seat depth will differ depending on pelvic position
ON A CHAIR:• subtract 1” for general use,
subtract 2” for very active users and custom rigid chairs, subtract 2” for clients with tight knees and foot propellers
Seat Depth - B
Seat depth while client is sitting upright in neutral
Added seat depth while client is sitting in posterior pelvic tilt
Lower Leg Length -C• Measure from back of the
knee to bottom of the foot
– Ground clearance – Cushion heightON A CHAIR:Measure with shoes on.
Subtract height of cushion.
Trunk Depth - K• Measure from
most posterior aspect of the trunk to front of chest– Determines length of
lateral thoracic pads
Armrest Height - I
• Measure from the seat surface to the elbow – Must add the cushion
thickness to achieve overall height needed. Measure in comfortable resting position.
Arm Length - L
• Place UE in optimal position• Overall length depends on
amount of support desired• Measure support length
required for adequate arm support.
• Measure to mid lower arm for active users.
• Measure to wrist for passive users.
• Measure to end of fingers for users with severe hemiplegia
Back Heights E
Add the cushion thickness toachieve height needed on achair.
E - Measure from seat surface to inferior angle of the scapula.
Required for active users with good trunk control.
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