Background
Vaughan-Jackson syndrome is the disruption of the digital extensor tendons, beginning on the ulnar side with the extensor digiti minimi (EDM) and extensor digitorum communis (EDC) tendon of the small finger. If the underlying pathology is not treated, sequential rupture of the ring, long, and index finger EDC tendons occurs; ultimately, rupture of the extensor indicis proprius (EIP) may follow.[1]
Rheumatoid arthritis is the most common underlying etiology of tendon rupture in the hand and wrist and is the usual clinical setting in which the term Vaughan-Jackson syndrome is used. O. J. Vaughan-Jackson's first report of extensor tendon rupture described 2 elderly laborers with degenerative arthritis of the distal radioulnar joint (DRUJ).[2] He found that the tendons were frayed and disrupted directly over a bony prominence projecting from the head of the ulna in both cases. In a subsequent report that appeared a decade later,[3] he described the process of attritional rupture of the digital extensor tendons in the rheumatoid hand, with which his name has become associated.
Other, less common, patterns seen in rheumatoid arthritis include rupture of the extensor pollicis longus (EPL) in the vicinity of Lister's tubercle within the third dorsal compartment[4] and rupture of the flexor pollicis longus and index finger's flexor digitorum profundus tendons within the carpal tunnel (ie, Mannerfelt syndrome).[5]
An image depicting Vaughan-Jackson syndrome can be seen below.
Typical appearance of the hand following rupture of the extensor tendons of the ring and small finger. Pathophysiology
Tendon ruptures in Vaughan-Jackson syndrome are primarily caused by gradual attrition of the ulnar head, which, in rheumatoid arthritis, may subluxate or dislocate dorsally due to loss of the normal supporting structures. The process of tendon wear is further accentuated when osteophytes and sharp prominences result from primary or secondary degenerative changes of the bone. Attrition of the unstable distal ulnar stump following partial ulnar excision (Darrach procedure) has also been described as a cause of digital extensor tendon rupture.[6, 7]
Direct invasion of the tendons and interference with normal tendon blood supply from rheumatoid tenosynovitis have been implicated as contributing causative factors. The cascade of wrist and DRUJ deformities produced by rheumatoid arthritis often results in palmar and ulnar subluxation of the extensor carpi ulnaris (ECU) tendon, taking it out of harm's way. The ECU and stout radial wrist extensors are seldom ruptured.[4, 8, 9]
A rupture of the extensor pollicis longus (EPL) tendon within the third dorsal compartment is occasionally seen as a complication following minimally displaced fracture of the distal radius in patients without rheumatoid arthritis. Other mechanical factors unrelated to rheumatoid disease that have been described as causes of extensor tendon rupture include abnormalities of the ulnar head from either traumatic subluxation or Madelung deformity; deformity of the radius or ulna following fracture; and orthopedic hardware on the dorsal surface of the distal radius. Bony prominences and local inflammatory changes resulting from both Kienbock disease and calcium pyrophosphate dihydrate crystal deposition disease (pseudogout) also have resulted in tendon rupture.[10, 11, 12, 13, 14, 15, 16]
Epidemiology
Frequency
United States
The vast majority of tendon ruptures occur in patients with rheumatoid arthritis, and the incidence of extensor tendon involvement is 10-15 times that of involvement of the flexor tendons. Although some studies have reported tendon rupture to be more common in the dominant hand, this has not been a universal finding.[4]
Mortality/Morbidity
Patients with rheumatoid arthritis are remarkably adept at coping with hand deformity and dysfunction. In patients with relatively normal metacarpophalangeal (MCP) joint function, loss of the ability to extend the digits and open the hand to grasp large objects imparts obvious functional limitations. Other individuals with severe MCP joint deformity or subluxation may not even be aware that extensor tendon rupture has occurred.
Age
Tendon rupture caused by osteoarthritis, although relatively rare, is more common in older persons, whereas no age restriction exists for tendon rupture caused by rheumatoid arthritis. The pattern of rheumatoid joint involvement can vary dramatically among individuals, sometimes even from one extremity to the other in the same patient. Tendon ruptures have been seen in patients who have had rheumatoid arthritis for as little as 2 years to as long as 25 years, although in most series, rheumatoid disease has been present for an average of 10-15 years.[17]
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