Ulna

The ulna consists of a body and two epiphysis – distal and proximal. The body of a bone has the trihedral Локтевая кость человека form, in it three edges: palmar (front), outside (interosseous) and dorsal (back), and three surfaces.

Ulna structure

The first line of a bone has the rounded-off form, the rear edge is directed back, and the interosseous edge has the pointed form and is turned to a beam bone. On an ulna there is a nutritious opening conducting in proksimalno the directed nutritious tubule. From above on the front surface of a bone, on border between the upper end and a body, tuberosity is located. The back surface of a bone is turned back, and medial – towards the forearm interior.

The proximal epiphysis has slightly reinforced form and above passes into an elbow shoot. In front this shoot is occupied with blokovidny cutting which from the lower party is limited to a coronal shoot. On an outside part of a coronal shoot elbow cutting – a junction of a joint circle of a head of a beam bone with an ulna is located. The crest of an instep support which goes down and reaches the upper edges of a body of a bone begins with the back party of beam cutting.

The distal epiphysis has slightly rounded off form. On it it is accurately possible to see an ulna head. Its surface concave and smooth, is turned to a wrist. On its periphery there is a joint surface – the joint circle of a bone connecting to a beam bone. The Medialnozadny surface of a head passes into an awl-shaped shoot which is well probed through skin.

Ulna changes

Often Перелом локтевой кости - операция an ulna change on border of average and its upper third or in an upper third are followed by dislocation of a head of a beam bone which can be displaced forward and up, or up and outside.

Thus, the shift of a head of a beam bone after an ulna change quite often leads to damage of a branch of a beam nerve. Such damage often happens as a result of strong direct stroke, for example, by the stick on a forearm exposed forward and up. The fracture of a bone results from similar blow with the essential shift of fragments at an angle, from the back party opened in the ulnarny party and as a result, there is dislocation of a head of a beam bone. Such damage characteristic of the protected person trying to reflect blow to the head is called damage of Montedzha, or the parrying change.

As a result of a change the back contour of a forearm is strongly bent, and the elbow joint extends as a result of head dislocation. During a palpation the patient feels sharp pain, and the head of a beam bone is stuck out.

Any movements in an elbow joint (passive, active, supinatsionny, pro-national ionic) are followed by severe pain therefore are limited. At passive bending in an elbow joint the springing movements are observed.

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