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Weightlifters, rowers, and other athletes are particularly prone to this condition. The patient presents with pain over dorsal aspect of the forearm and wrist. The tendon of 6th compartment (extensor carpi ulnaris) can suffer recurrent dislocation due to a tear of the ulnar side of the compartment.
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.
Thenar space (deep to flexor tendons and 1st lumbrical muscle). 1st dorsal interosseous muscle. Probe in dorsal extension of thenar space deep to adductor pollicis muscle. Septum separating thenar from midpalmar space. Common palmar digital artery. Proper palmar digital arteries and nerves.
The absence of the tendon of the extensor digitorum communis to the little finger is associated with the thicker type 3r juncturae tendinum in the fourth intermetacarpal space. [3] Hirai et al. reported type 1 junturae tendinum between the extensor digiti minimi and the extensor digitorum communis to the ring finger in 6% of the specimens. [1]
Three dorsal forearm muscles act on the thumb: The abductor pollicis longus originates on the dorsal sides of both the ulna and the radius, and from the interosseous membrane. Passing through the first tendon compartment, it inserts to the base of the first metacarpal bone. A part of the tendon reaches the trapezium, while another fuses with ...
The second, third, and fourth dorsal interossei have insertions both proximally on the base of the metacarpal and hood, and distally on the lateral bands and central tendon of the extensor mechanism. The abductor digiti minimi, effectively the "fifth dorsal interosseus" or the dorsal interosseus of the little finger, has only a proximal insertion.
At the insertion the tendon of the extensor digitorum brevis manus often joins the extensor indicis proprius, [3] although it also occurs when the extensor indicis proprius is absent. It was also reported to coexist with the extensor medii proprius , another anatomical variation in the extensor compartment of the hand. [ 8 ]