. Atlas and epitome of traumatic . /■ ReichtxaUl. Aftinchen. FRACTURES OF THE UPPER EXTREMITY. 205 upper fragment is drawn upward by the triceps. Owingto the superficial position of the olecranon, the conditionis readily determined by palpation. The joint and theremaining bony prominences of the articular region re-main intact, except, of course, that the extravasation pro-duced by the fracture also affects the joint. The patient isunable to extend the arm. As a rule, the upper fragment. Fig. 90.—Skiagraph of a fracture of the olecranon. Keuter, a roofer,eighteen years old, fell on h
. Atlas and epitome of traumatic . /■ ReichtxaUl. Aftinchen. FRACTURES OF THE UPPER EXTREMITY. 205 upper fragment is drawn upward by the triceps. Owingto the superficial position of the olecranon, the conditionis readily determined by palpation. The joint and theremaining bony prominences of the articular region re-main intact, except, of course, that the extravasation pro-duced by the fracture also affects the joint. The patient isunable to extend the arm. As a rule, the upper fragment. Fig. 90.—Skiagraph of a fracture of the olecranon. Keuter, a roofer,eighteen years old, fell on his elbow. Clinically the symptoms offracture of the olecranon were found. In the skiagraph there is found,in addition to this fracture, a fissured fracture of the upper articularextremity of the ulna, separating the base of the coronoid recovery. may be brought down far enough to elicit crepitation bymoving it from side to side. If the contact of the fragments has been maintained bythe partial preservation of the periosteal investment andthe lateral fibers of the tendon, the prognosis is very fav-orable for firm bony union without operation. If thefragments are separated, bony union is hardly to be ex- 206 FRACTURES AND DISLOCATIONS. pected. In most cases the bones become united by con-nective tissue. This is partly due to the fact that thefragments are not covered by periosteum on the sidedirected toward the joint, but possess a thick cartilaginousinvestment, Avhile on the
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