What characterizes acute tenosynovitis?

Acute tenosynovitis is characterized by a rapid onset of symptoms, which is critical for differentiating it from chronic conditions. This rapid development often includes articular crepitus, a grating sensation that occurs as the inflamed tendon moves within its synovial sheath, and diffuse swelling around the affected tendon. The inflammation leads to increased synovial fluid production, causing both swelling and discomfort in the area.

The other options describe different presentations that may not be consistent with acute tenosynovitis. Gradual swelling without crepitus suggests a chronic condition rather than an acute inflammatory response. Localized thickening of the tendon typically indicates a long-standing issue or chronic tendinopathy, while persistent pain with no swelling may imply a more stable condition that does not involve the rapid inflammatory process characteristic of acute tenosynovitis. Therefore, recognizing the rapid onset and accompanying symptoms is essential in identifying and treating this condition effectively.