NURS 6501 Week 2: osteoarthritis vs rheumatoid arthritis

The comparison is the foundation and it has one central contrast: osteoarthritis is a mechanical and metabolic disorder of the joint, rheumatoid arthritis is a systemic autoimmune disease that happens to attack joints. In osteoarthritis, cartilage matrix degradation outpaces chondrocyte repair, subchondral bone remodels and sclerose, osteophytes form, and the low-grade synovitis that appears is secondary to the mechanical damage. In rheumatoid arthritis the synovium is the primary target: autoantibodies including rheumatoid factor and anti-citrullinated protein antibodies drive an inflammatory pannus that invades and erodes cartilage and bone from the joint margins. That difference explains everything clinical downstream, and the prompt asks for similarities as well as differences, so note that both end in joint destruction, pain and functional loss even though they arrive there by different routes. The presentations diverge sharply: asymmetric weight-bearing joints with brief morning stiffness against symmetric small joints with stiffness lasting over an hour, plus systemic features that osteoarthritis never produces.

Then select exactly two factors from the list the prompt gives — genetics, gender, ethnicity, age or behaviour — and take each one through all three of pathophysiology, diagnosis and treatment. Dropping the diagnosis or treatment leg is the commonest way to lose marks here. Age is the most productive choice given the Ashley Russell case in the stem: it changes the prior probability so completely that an inflammatory arthritis in a toddler is juvenile idiopathic arthritis until proven otherwise, it changes the diagnostic approach because a young child cannot report stiffness and presents instead with a swollen knee and a refusal to walk, and it changes treatment because growth, ophthalmological screening for uveitis and drug safety all enter. Gender works well too — the female predominance in rheumatoid arthritis, with pregnancy-associated remission and postpartum flare, is a genuine pathophysiological story rather than an epidemiological footnote.