Illustration of body and joint angles measured with the CUELA system, evaluation parameters used and assessment criteria in line with ergonomic norms
| Body areas | Joint/body area | Degree of freedom according to medical definitions | Evaluation parameter | Angle range according to ergonomic standards |
|---|---|---|---|---|
| Head/neck | Head | Sagittal inclination | Head tilted to the front (HT_f)24 25 | Neutral: 0 to 25° Moderate: 25 to 85° Awkward: <0° and >85° |
| Lateral inclination | Head tilted to the right (HT_r)25 | Neutral: −10 to 10° Awkward: <−10° and >10° | ||
| Cervical spine (CS) | Flexion/extension | Neck curvature to the front (NC_f) (difference between head and TS)24 25 | Neutral: 0 to 25° Awkward: <0° and >25° | |
| Lateral flexion | Neck curvature to the right (NC_r) (difference between head and TS)24 25 | Neutral: −10 to 10° Awkward: <−10° and >10° | ||
| Back | Thoracic spine (TS) | Flexion/extension | TS inclination to the front (TSI_f)24 25 | Neutral: 0 to 20° Moderate: 20 to 60° Awkward: <0° and >60° |
| Lateral flexion | TS inclination to the right (TSI_r)24 25 | Neutral: −10 to 10° Moderate: −10 to −20° Moderate: 10 to 20° Awkward:<−20° and > 20 | ||
| Lumbar spine (LS) | Flexion/extension | LS inclination to the front (LSI_f) | No ergonomic layout available | |
| Lateral flexion | LS inclination to the right (LSI_r) | |||
| Trunk (T) | Flexion/extension | Back curvature to the front (BC_f) (difference between TS and LS)24 25 | Neutral: 0 to 20° Moderate: 20 to 40° Awkward: <0° and > 40° | |
| Inclination of the torso to the front (TI_f) (median flexion of TS and LS)24 25 | Neutral: 0 to 20° Moderate: 20 to 60° Awkward: <0° and >60° | |||
| Lateral flexion | Back curvature to the right (BC_r) (difference between TS and LS)24 25 | Neutral: −10 to 10° Moderate: −10 to −20° Moderate: 10 to 20° Awkward: <−20° and >20° | ||
| Inclination of the torso to the right (TI_r) (median lateral flexion of TS and LS)24 25 | ||||
| Torsion | Back torsion to the right (BT_r) (difference between TS and LS)25 |
CUELA, computer-assisted acquisition and long-term analysis of musculoskeletal loads.