516 
PARALYSIS OF RADIAL NERVE. 
bone were freely movable, and not (as might appear from inspection of 
the figure) rigidly fixed together. 
The reason why fractured first rib and marked radial paralysis are so 
often associated is to be found in the proximity of the brachial plexus, 
from which the radial nerve originates, to the site of fracture. Even 
in incomplete fracture a sufficient effusion of blood may occur to 
seriously interfere with the brachial plexus. 
The symptoms vary according to the degree and extent of the paralysis. 
When complete, the limb takes a position resembling that in very painful 
Fig. 193.—Complete paralysis of the radial nerve. 
affections of the foot. The shoulder and elbow are extended, while all 
the other joints are fixed in a position of volar flexion, those of the 
phalanges often to such a degree that the anterior surface of the wall of 
the foot may be almost in contact with the ground (fig. 198), the limb under 
such circumstances appearing to be too long. In attempting to move, 
the upper portions of the limb are carried forward in the ordinary fashion, 
but cannot support the weight of the body on account of inability to bring 
the joints into the necessary position. The limb collapses at every attempt 
to place weight on it. 
The disease is, therefore, characterised by lameness when weight is 
placed on the limb (supporting leg lameness), flexion of all joints from 
the elbow downwards, and inability to bring the foot sufficiently forward 
