Measuring Instructions

• 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

Head Height - H and N

Add the cushion thickness to achieve height needed

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.

Wheelchair Documentation Figure