LUBA — Loading on the Upper Body Assessment
A posture-only joint-motion assessment focused on physical discomfort and localised stress accumulating in the trunk, neck, and upper limbs.
What is LUBA?
LUBA scales risk entirely on how far a joint strays from its natural anatomical neutral zone, built on experimental data mapping a "Composite Index of Perceived Discomfort" and maximum holding times (MHT) across joint configurations. It explicitly ignores load weight and duration to focus strictly on structural pose quality, using elbow flexion as its scientific reference point.
When to use LUBA
Deploy when evaluating static or semi-static work postures (seated or standing) where the primary risk is extreme joint deviation rather than heavy load handling.
Primary citation: Kee, D. & Karwowski, W. (2001). LUBA: An assessment technique for postural loading on the upper body based on joint motion discomfort and maximum holding time. Applied Ergonomics, 32(4), 357–366.
What LUBA assesses
The body segments and task variables evaluated in a LUBA assessment.
What it assesses
- Neck and back angular deviation
- Shoulder and elbow position
- Forearm pronation / supination
- Wrist flexion plus ulnar / radial deviation
Scoring and action levels
Final score range: Composite Index → 4 action categories
Developed by: Kee & Karwowski, 2001
How Ergocure.ai applies LUBA
Ergocure AI extracts LUBA joint angles — neck, trunk, shoulder, elbow and wrist deviation from anatomical neutral — from front- and side-view phone captures using on-device landmark detection, or camera-free from a structured questionnaire. The joint-motion discomfort indices are summed into the Composite Index and mapped to an action category, then a certified ergonomist reviews and signs off before the worker sees the result.
Captured on any phone, scored for LUBA, and validated by a certified ergonomist — face-blurred on-device.
LUBA — frequently asked questions
What is LUBA (Loading on the Upper Body Assessment)?
A posture-only joint-motion assessment focused on physical discomfort and localised stress accumulating in the trunk, neck, and upper limbs.
What is a good LUBA score?
Composite Index → 4 action categories. A score of I (≤ 5) is low load — acceptable posture — while IV (> 15) is very high load and means immediate postural modification.
When should you use LUBA?
Deploy when evaluating static or semi-static work postures (seated or standing) where the primary risk is extreme joint deviation rather than heavy load handling.
How does Ergocure score LUBA?
Ergocure AI extracts LUBA joint angles — neck, trunk, shoulder, elbow and wrist deviation from anatomical neutral — from front- and side-view phone captures using on-device landmark detection, or camera-free from a structured questionnaire. The joint-motion discomfort indices are summed into the Composite Index and mapped to an action category, then a certified ergonomist reviews and signs off before the worker sees the result.
Who developed LUBA?
LUBA was developed by Kee & Karwowski, 2001. Kee, D. & Karwowski, W. (2001). LUBA: An assessment technique for postural loading on the upper body based on joint motion discomfort and maximum holding time. Applied Ergonomics, 32(4), 357–366.
Related assessment methods
Methods commonly used alongside LUBA in a complete ergonomic assessment.
See LUBA in a live assessment
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