In patients with dorsal tenosynovitis, the tenosynovium becomes hypertrophic (thickened and swollen). Dorsal tenosynovitis can cause pain as the extensor tendons move on the dorsum of the hand and wrist and collide with the dorsal wrist extensor retinaculum during combined wrist and finger extension. Persistent proliferative dorsal tenosynovitis can cause extensor tendon rupture.1 If the tenosynovitis affects only the first dorsal compartment, which includes the abductor pollicis longus (APL) and the extensor pollicis brevis (EPB), it is called DeQuervain’s disease. Symptoms of DeQuervain’s include swelling at the radial styloid. However, DeQuervain’s often occurs with hypertrophic tenosynovial changes.2
Pathopysiology
Initially, the underlying diagnosis causing the dorsal tenosynovitis is frequently unknown and can be difficult to establish. Rheumatoid arthritis (RA), tuberculosis, gout, mycobacterium marinum infections, sarcoidosis or wrist osteoarthritis are diseases that can cause dorsal tenosynovitis. Patients presenting with RA often have involvement of the radiocarpal and distal radioulnar joints and the overlying extensor tendons.1