All questions of Rheumatology for PLAB/UKMLA Exam

Understanding Bony Erosion in Different Conditions
Bony erosion is a significant feature observed in various inflammatory and degenerative diseases. However, not all conditions exhibit this characteristic.
Conditions Associated with Bony Erosion
- Gout:
Gout is caused by the deposition of uric acid crystals in joints, leading to inflammation and erosive changes in bone. Bony erosion is often observed in chronic cases.
- SLE (Systemic Lupus Erythematosus):
SLE is an autoimmune disorder that can cause various manifestations, including arthritis. Inflammatory processes in SLE can lead to erosive changes in the bones.
- Osteoarthritis:
Osteoarthritis primarily involves cartilage degradation and subchondral bone changes. While it leads to joint space narrowing and bone spurs, it typically does not cause significant bony erosion as seen in inflammatory arthritides.
Condition Not Associated with Bony Erosion
- Psoriasis:
Psoriasis is a skin condition, and when it presents with arthritis (psoriatic arthritis), it can lead to erosive changes. However, in typical cases of psoriasis without arthritis, bony erosion is not a characteristic feature.
Conclusion
In summary, while gout, SLE, and psoriatic arthritis can lead to bony erosion, osteoarthritis is primarily characterized by cartilage wear and does not typically exhibit bony erosion. Therefore, the correct answer to the question is option 'C' - Psoriasis, when considered in its non-arthritic form.