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At the level of the PIP joint the extensor mechanism splits into three bands. The central slip attaches to the dorsal tubercle of the middle phalanx near the PIP joint. The pair of lateral bands, to which contribute the extensor tendons, continue past the PIP joint dorsally to the joint axis.
This flexion deformity of the proximal interphalangeal joint is due to interruption of the central slip of the extensor tendon such that the lateral slips separate and the head of the proximal phalanx pops through the gap like a finger through a button hole (thus the name, from French boutonnière "button hole"). The distal joint is ...
Occasionally the first tendon is connected to the second by a thin transverse band. Collectively, these are known as the sagittal bands; they serve to maintain the central alignment of the extensor tendons over the metacarpal head, [3] thus increasing the available leverage. Injuries (such as by an external flexion force during active extension ...
Severing of the central slip by lacerations or a dislocation of the middle phalanx towards the bottom of the finger causes the tendon to tear off the bone [1] A secondary cause of boutonnière deformity is rheumatoid arthritis causing chronic inflammation that eventually results in tendon damage. [2]
The extensor tendons are connected to the second by a thin transverse band, known as the juncturae tendinum; they serve to maintain the central alignment of the extensor tendons over the metacarpal head, [5] thus increasing the available leverage. Injuries (such as by an external flexion force during active extension) may allow the tendon to ...
Extensor compartments of wrist (back of hand) The fingers have two long flexors, located on the underside of the forearm. They insert by tendons to the phalanges of the fingers. The deep flexor attaches to the distal phalanx, and the superficial flexor attaches to the middle phalanx. The flexors allow for the actual bending of the fingers.
The extensor tendons are held in place by the extensor retinaculum. As the tendons travel over the posterior (back) aspect of the wrist they are enclosed within synovial tendon sheaths . These sheaths reduce the friction to the extensor tendons as they traverse the compartments that are formed by the attachments of the extensor retinaculum to ...
The central portion occupies the middle of the palm, is triangular in shape, and of great strength Its apex is continuous with the lower margin of the transverse carpal ligament, and receives the expanded tendon of the palmaris longus. Its base divides below into four slips, one for each finger.