CRP and osteoporosis: Seventeen variables, plus age, were entered into the original model including: pes planovalgus foot-type, tender joint count (lower limb), gait speed, foot problem score, hallux strength, ankle range of motion, peak plantar pressure midfoot, eyes closed AP sway, FISAP, disease duration, DAS28-CRP, DMARD monotherapy, combination DMARD therapy, number of medications, number of co-morbid conditions, vascular disease and osteoporosis.