Measurement Support - Lumo Socket Spacer

Lumo ▸ Lumo Socket Spacer
1. Template
2. Mark elbow
3. Photos
4. Socket type
5. Measure L4
6. Measure L5
7. Result

Print & Validate Template

Print the macu4 measurement template at 100% scale (no scaling). Make sure you use a credit-card-sized card to control that the template was printed correctly — place it on the card field, it must fit exactly. Note: a business card does NOT have credit-card-sized dimensions. Leave the card on the template for the photos.

Printer White A4 paper White US Letter paper Credit-card-sized card
Print and validate template

Mark Elbow Crease

Using a skin-friendly pen, draw a straight line through the elbow crease. This serves as a reference for the photos.

Skin-friendly pen (dark ink)
Mark elbow crease

Take 3 Photos

Photo 1: Align the affected arm along the dashed line. Elbow touches the logo circle on the template.
Photo 2: Rotate the arm 90° so the medial epicondyle is centered on the logo circle.
Photo 3: Place both arms side by side on the template. Take the photo from at least 75 cm distance.

Smartphone / Camera Helper person
Arm position Both arms comparison

Send photos to macu4 for validation

macu4 will check that the photos meet the measurement requirements before you continue with the spacer calculator.

Which socket is the spacer fitted to?

The socket type determines which measurement reference and which built-in offset the calculator uses.

L4 — Affected arm

Measure from the Epicondylus Medialis to the distal part of the stump on the affected arm.

L4 measurement on affected arm
mm
Epicondylus Medialis → distal part of the stump

L5 — Non-affected arm

Measure from the Epicondylus Medialis to the middle of the palm on the non-affected arm.

mm
Epicondylus Medialis → middle of the palm (non-affected arm)

Your Lumo Socket Spacer

Based on your measurements and socket type, the calculator picked the closest available Lumo spacer size.

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mm

Tips

  • Ensure good lighting and no shadows on the template when taking the photos.
  • Hold the camera perpendicular to the template at 75 cm – 1 m distance.
  • Lift the arm slightly so soft tissue does not flatten against the template.
  • Available Lumo spacer sizes: A (20 mm), B (35 mm), C (50 mm), D (65 mm), E (80 mm).
Lumo Measurement Instructions (PDF)