What is a classic feature of suppurative flexor tenosynovitis?

In the context of suppurative flexor tenosynovitis, a classic feature is pain in extension. This condition is characterized by inflammation of the flexor tendon sheath, typically resulting from an infection. When the flexor tendon sheath is inflamed, any attempt to extend the fingers can cause significant pain. This is often associated with a protective reflex that results in the patient favoring a flexed position of the fingers, as extending the fingers increases discomfort.

In cases of suppurative flexor tenosynovitis, other clinical signs may include swelling along the course of the flexor tendon, tenderness, and sometimes systemic signs of infection. However, pain upon extension is particularly notable and a key indicator in the examination of patients suspected of having this condition.

The emphasis is placed on the discomfort during extension because it highlights the affected mechanism—extension of the fingers puts tension on the inflamed tendons, leading to increased pain. This can help differentiate this condition from other hand injuries or disorders that may present differently with respect to joint positioning and mobility.