De Quervain’s disease is:
**Core Concept**
De Quervain's disease is a stenosing tenosynovitis of the first dorsal compartment of the wrist, affecting the tendons of the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) muscles. This condition is characterized by inflammation and narrowing of the tendon sheaths, leading to pain and tenderness in the thumb.
**Why the Correct Answer is Right**
The pathophysiology of De Quervain's disease involves repetitive strain and microtrauma to the APL and EPB tendons, leading to inflammation and fibrosis of the tendon sheaths. This causes a narrowing of the compartment, resulting in compression of the tendons and subsequent pain and dysfunction. The condition is often exacerbated by activities that involve grasping, gripping, or repetitive thumb movements.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not accurately describe De Quervain's disease.
**Option B:** This option is incorrect as it refers to a different condition, carpal tunnel syndrome, which affects the median nerve.
**Option C:** This option is incorrect as it refers to a condition affecting the flexor tendons of the wrist, not the extensor tendons.
**Clinical Pearl / High-Yield Fact**
De Quervain's disease is often associated with other conditions such as osteoarthritis, rheumatoid arthritis, and thyroid disorders, making a comprehensive medical history essential for diagnosis.
**Correct Answer: C. De Quervain's disease is a stenosing tenosynovitis of the first dorsal compartment of the wrist, affecting the tendons of the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) muscles.