Kanavel's sign is a clinical sign found in patients with infection of a flexor tendon sheath in the hand (flexor tenosynovitis), a serious condition which can cause rapid loss of function of the affected finger. The sign consists of four components: 1. * the affected finger is held in slight flexion. 2. * there is fusiform swelling over the affected tendon. 3. * there is tenderness over the affected tendon. 4. * there is pain on passive extension of the affected finger. The sign is named after Allen B. Kanavel who first named them in 1912.
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