Table 3.

Candidate outcome for core and extended clinical foot datasets.

Outcome	Domain
CORE
1. Swollen foot joint count	Active disease
2. Tender foot joint count	Joint destruction/soft-tissue damage
3. Foot Impact Scale-RA	Foot impairment and disability
4. Structural Index	Foot deformity
5. Radiographic erosions	Joint destruction
EXTENDED
6. Ultrasound core set	Active disease/joint destruction Soft-tissue disease
7. Gait analysis - spatiotemporal, plantar pressure, joint motion and forces	Functional