Anatomical Hand Rheumatoid Arthritis Model with Display Stand & Education Card. Life-size hand model demonstrating the symptoms and progression of Rheumatoid Arthritis (RA). Cutaway views reveal the effects of the disease on the different joints and ligaments including the flexor and extensor tendons, cartilage, muscle, bones, ligaments, joint spaces and synovial fluid. The model shows a cross-section of the metacarpophalangeal joint capsules to demonstrate progression of RA which can include synovial swelling, degeneration and erosion. Other associated deformities are demonstrated including swan neck on the second and boutonniere on the third phalanges.