Spontaneous Ulnar Dislocation of the Index, Long, Ring and Small Finger Extensor Tendons at the Metacarpophalangeal Joints: A Case Report

Abstract

Finger extensor tendon dislocation at the metacarpophalangeal joint is caused by various etiologies, such as trauma, congenital anomaly, or rheumatoid arthritis. When the dislocation occurs with no etiology, this is called spontaneous dislocation. Although spontaneous extensor tendon dislocation in one, two or three fingers has been described, to our knowledge, simultaneous dislocation in four fingers has not been reported. In this paper, we report a spontaneous ulnar dislocation of all the extensor tendons in the index, long, ring, and small fingers. Repair of the radial sagittal bands of the extensor digitorum communis of the middle and ring fingers reduced dislocation of all the extensor tendons in four fingers.

Extensor tendon dislocation of the hand: six cases in a family

“…Dear Sir, Dislocation of hand extensor tendons (ETD) is relatively uncommon. Among four types of ETD (degenerative, traumatic, spontaneous and congenital), congenital dislocations are rarer and can be seen alone or in association with other diseases (Inoue and Tamura 1996;Ozcanli et al, 2012;Tanabe et al, 2011;Ishizuki, 1990). Extensor tendon dislocations in the same family have not been reported before.…”

“…Her cousin, a 14-yearold girl (III.1) had the same symptoms in her right middle and ring fingers. The father, sister, uncle and aunt (respectively 42, 17, 46 and 32 years old) of the first patient, had radial dislocations of the Extensor tendon dislocations are most often caused by rupture or attenuation of the sagittal bands; the main stabilizers of the extensor digitorum communis (EDC) at the metacarpophalangeal (MCP) joints (Inoue and Tamura, 1996;Tanabe et al, 2011). While in traumatic cases, rupture typically occurs both in the sagittal bands and the dorsal structures of the MCP joint; in spontaneous cases only the superficial layer of the sagittal bands is injured, keeping the dorsal hood and capsule intact (Ishizuki, 1990).…”

Spontaneous, isolated rupture of the flexor digitorum superficialis tendon in zone II and annular pulley ruptures

“…Extensor tendon dislocations are most often caused by rupture or attenuation of the sagittal bands; the main stabilizers of the extensor digitorum communis (EDC) at the metacarpophalangeal (MCP) joints (Inoue and Tamura, 1996;Tanabe et al, 2011). While in traumatic cases, rupture typically occurs both in the sagittal bands and the dorsal structures of the MCP joint; in spontaneous cases only the superficial layer of the sagittal bands is injured, keeping the dorsal hood and capsule intact (Ishizuki, 1990).…”