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Fractures in the joints are often caused by jammed finger injuries, the hand equivalent of a stubbed toe. If a tendon pulls away the bit of bone to which it is attached (an avulsion fracture, shown in the image at the top of the page, and in the Busch fracture images below), that will also lead to a fracture in a joint. [1]
Unlike the proximal fracture fragment, strong ligaments and muscle tendons of the hand tend to pull this fragment out of its correct anatomical position. [citation needed] Specifically: tension from the abductor pollicis longus muscle (APL) subluxates the fragment in a dorsal, radial, and proximal direction
The muscles of the hand can be subdivided into two groups: the extrinsic and intrinsic muscle groups. The extrinsic muscle groups are the long flexors and extensors. They are called extrinsic because the muscle belly is located on the forearm. The intrinsic group are the smaller muscles located within the hand itself. The muscles of the hand ...
fingers: Flexor digitorum superficialis and profundus, lumbricals, and interossei, assisted in the case of the little finger by the flexor digiti minimi brevis: extensor digitorum communis, extensor indicis proprius, and extensor digiti minimi muscle: thumb: flexor pollicis longus and brevis: extensor pollicis longus and brevis
One head originates on the radial side of the flexor digitorum profundus tendon corresponding to the ring finger, while the other originates on the ulnar side of the tendon for the middle finger. The muscle passes posteriorly along the radial side of the ring finger to insert on its extensor expansion. Fourth: bipennate
The lateral part of this surface serves for the attachment of the fourth interosseus dorsalis; the medial part is smooth, triangular, and covered by the extensor tendons of the little finger. The palmar surface is similarly divided: Its lateral side (facing the fourth metacarpal) provides the origin for the third palmar interosseus , its medial ...
In medicine a Busch fracture [1] is a type of fracture of the base of the distal phalanx of the fingers, produced by the removal of the bone insertion of the extensor tendon. Without the appropriate treatment, the finger becomes a hammer finger. It would correspond to the group B of the Albertoni classification. [2]
These tendons, along with those of flexor digitorum profundus, are enclosed by a common flexor sheath. The tendons attach to the anterior margins on the bases of the intermediate phalanges of the four fingers. These tendons have a split (Camper's Chiasm) at the end of them through which the tendons of flexor digitorum profundus pass.