A 25-year-old lady presents with inability to form a fist and marked stiffening of joints. Diagnosis is.
**Core Concept**
The question is testing the student's knowledge of a condition characterized by stiffness and immobility of the joints, likely due to an inflammatory or autoimmune process. This condition involves the deposition of abnormal proteins in the joints, leading to inflammation and fibrosis.
**Why the Correct Answer is Right**
The correct answer is likely **Psoriatic Arthropathy** or **Psoriatic Arthritis (PsA)**. PsA is a type of arthritis that occurs in some people with psoriasis, an autoimmune condition that causes red, scaly patches on the skin. The stiffness and inability to form a fist in the patient's case are classic symptoms of PsA. The condition is characterized by inflammation and fibrosis in the joints, leading to stiffness and immobility.
**Why Each Wrong Option is Incorrect**
**Option A:** **Rheumatoid Arthritis (RA)**. While RA is an autoimmune condition that causes joint inflammation and stiffness, it typically affects multiple joints symmetrically and is not typically associated with the inability to form a fist.
**Option B:** **Osteoarthritis (OA)**. OA is a degenerative joint disease that causes stiffness and immobility, but it is not typically associated with inflammation or autoimmune processes.
**Option C:** **Gouty Arthritis**. Gout is a type of arthritis caused by the deposition of urate crystals in the joints, leading to inflammation and pain. However, it is not typically associated with stiffness and immobility of the joints.
**Clinical Pearl / High-Yield Fact**
Psoriatic Arthritis often presents with a classic "dactylitis" or "sausage finger" appearance, where the fingers become swollen and inflamed, making it difficult to form a fist. This is a key clinical feature to look out for when diagnosing PsA.
**Correct Answer:** C.