WOMAC — Western Ontario and McMaster Universities Arthritis Index

Calculates the WOMAC arthritis index from three subscales: Pain (5 items), Stiffness (2 items), and Physical Function (17 items). Likert version: 0–4 per item. Higher scores = worse function. Total score 0–96 (Likert) or 0–240mm (VAS). Used in hip and knee OA.