Types
- Typically presents with involvement of small joints in the hands and feet with pain, swelling, and stiffness on inactivity, that improves with activity
- Prominent symmetry of involvement is Typical of RA
Articular manifestations
- Polyarthralgia :Symmetrical pain and swelling of affected joints
- Frequently affected joints : Metacarpophalangeal joints, Proximal interphalangeal joints, joints of fingers, Wrists, mid foot, Metatarsophalangeal joints, Knee joints, ankles
- Usually not involved: Distal interphalangeal joints, sacroiliac joints, thoracolumbar spine
- Morning stiffness : that usually improves with activity
Joint deformities
- Ulnar deviation : that occurs at the metacarpophalangeal joints
- Swann neck deformity : Flexion of the distal interphalangeal joints and MCP with hyperextension of PIP joint
- Boutonniere deformity: PIP flexion and DIP hyperextension
- Hitchhiker thumb deformity (Z deformity of the thumb): hyperextension of the interphalangeal joint with fixed flexion of the MCP joint
- Cock up toe deformity
- Hammer toe
- Rocker bottom deformity
- Atlanto-axial subluxation
Extra-articular manifestations
Patients with positive rheumatoid factor (RF) are more likely to develop extra-articular manifestations of rheumatoid arthritis
- Constitutional symptoms: low-grade fever, myalgia, malaise, fatigue, weight loss, night sweats, uncommonly rheumatoid cachexia
- Rheumatoid nodules : Non-tender, firm, subcutaneous swellings ,commonly in areas exposed to higher pressure e.g., extensor side of the forearm, bony prominences
- Skin: palmar erythema, Raynaud’s phenomenon, RA vasculitis, pyoderma gangernosum
- Lungs: Pleuritis , Interstitial pneumonia ,Fibrosis
- Eye: keratoconjunctivitis sicca, scleritis, and episcleritis
- Heart: pericarditis and myocarditis
- Haematological : Anaemia of chronic disease Splenomegaly (Felty syndrome)
Other
- Tenosynovitis and bursitis
- Carpal tunnel syndrome (entrapment neuropathy)
- Typical nocturnal paresthesia of volar hand and fingers I–III
- Atrophy of thenar muscles
Differential diagnosis
- Osteoarthritis
- Psoriatic arthritis
- Gout
- Pseudogout