"De Quervain tenosynovitis, also known as washerwoman's sprain/strain, is a painful stenosing tenosynovitis involving the first extensor (dorsal) tendon compartment of the wrist (typically at the radial styloid). This compartment contains the abductor pollicis longus (APL) and extensor pollicis brevis (EPB) tendons."
"Patients present with pain on thumb and wrist movement and with focal tenderness and swelling over the radial styloid. There is usually a positive Finkelstein test (pain on passive ulnar deviation) although this is not pathognomonic. Triggering or crepitus may also be elicited 3."
"focal abnormalities of the radial styloid including cortical erosion, sclerosis or periosteal reaction 6"
"Conservative treatment with anti-inflammatory medications, rest and splinting can be effective. Corticosteroid injection into the tendon sheath is usually very effective with 50% of patients experiencing symptom resolution after one injection. A second injection given at least a month later permanently relieves symptoms in another 40-45% of patients 4."
"History and etymology"