Write a short note on Osteoarthritis vs Rheumatoid Arthritis.
Two Contrasting Arthritides
Osteoarthritis (OA) and rheumatoid arthritis (RA) are the two commonest chronic arthritides but are fundamentally different: OA is a degenerative disorder of cartilage, while RA is a systemic autoimmune inflammatory disease of synovium. Distinguishing them guides investigation and treatment.
| Feature | Osteoarthritis | Rheumatoid arthritis |
|---|---|---|
| Nature | Degenerative (cartilage) | Autoimmune inflammatory (synovium) |
| Age/sex | Older; both sexes | 30–50; women > men |
| Joints | Weight-bearing, dip/PIP, thumb base | Symmetrical MCP/PIP/wrist; spares dip |
| Morning stiffness | < 30 min | > 1 hour |
| Pain pattern | Worse with use, better with rest | Worse with rest, eases with activity |
| Systemic upset | None | Fatigue, fever, nodules, organ involvement |
| Serology | Normal | RF / anti-CCP positive, ↑ESR/CRP |
| X-ray | ‘loss’, osteophytes, sclerosis | Erosions, peri-articular osteoporosis |
CLINICAL PEARL
Two quick discriminators: dip involvement + Heberden’s nodes favours OA, while prolonged morning stiffness + symmetrical MCP/wrist disease + positive serology favours RA.
WHY It Matters
The distinction is therapeutically crucial: RA needs early DMARDs to prevent joint destruction and has systemic implications, whereas OA is managed with conservative measures and, ultimately, arthroplasty. Misclassifying RA as OA loses the window for disease-modifying treatment.
Overlap & Pitfalls
Although the classic pictures are distinct, overlap occurs: an elderly patient may have both conditions, and RA can lead to secondary osteoarthritis in damaged joints. Inflammatory markers and serology, the pattern and symmetry of joint involvement, and the character of the stiffness together resolve most cases. The essential clinical reflex is to recognise an inflammatory pattern early, because it mandates prompt specialist referral for disease-modifying treatment.
CLINICAL PEARL
If you remember only one line: OA is worse with use and better with rest (mechanical), while RA is worse with rest and better with activity (inflammatory) — the pain rhythm alone points strongly to the diagnosis.
Heberden nodes in OA; MCP involvement in RA.
KEY POINT
Key points TO remember
- OA = degenerative cartilage disease; RA = systemic autoimmune synovitis.
- OA: dip/weight-bearing, brief stiffness, mechanical pain, normal bloods.
- RA: symmetrical MCP/PIP/wrist (spares dip), >1 h stiffness, RF/anti-CCP+, systemic upset.
- RA needs early DMARDs; OA is conservative ± arthroplasty.
EXAM TIP
Sources: Maheshwari's Essential Orthopaedics; Apley & Solomon's System of Orthopaedics and Trauma; AO Principles of Fracture Management.
All questions in Arthritis & Joint Disorders
- Q1Define Osteoarthritis. Describe its clinical features, investigations, management and complications. ★
- Q2Define Rheumatoid Arthritis. Describe its clinical features, investigations, management and complications. ★
- Q3Define Avascular Necrosis of the Femoral Head. Describe its causes, clinical features, management and complications. ★
- Q4Joint Replacement ★
- Q5Define Ankylosing Spondylitis. Describe its clinical features, investigations, management and complications. ★
- SN1Define Gout & Pseudogout. Describe its clinical features and management. ★
- SN2Define Rheumatoid Hand Deformities. Describe its management and treatment.
- SN3Define Charcot (Neuropathic) Joint. Describe its causes and investigations.
- SN4Write a short note on Osteoarthritis vs Rheumatoid Arthritis. ★
- SN5Frozen Shoulder
- SN6Define Haemophilic Arthropathy. Describe its management and investigations.
- SN7Describe Arthrodesis & Arthroplasty in detail.