S. J. J. HARGER. 
5-4 
than in the plantar operation, simply involves the same general 
principles of surgery and an accurate knowledge of the ana¬ 
tomical relation of the parts. The nerve, situated more or less 
deep, accompanies the posterior radial artery and vein which 
must not be injured. The section is made at several points . 
1. On the inner side of the elbow, at the elbow joint, 
where this nerve passes over the internal lateral ligament; 
at this point the nerve is covered by the sterno-aponeuroticus 
muscle. 
2. At the upper part of the inside of the forearm before 
eivinor off the large branch to the posterior muscles of the 
forearm. 
3. At about the upper fourth of the forearm after giving off 
the above branch. I prefer the last point of operation, because 
the posterior radial muscles still retain their nerve supply which 
does not innervate the parts below the knee that are diseased. The 
incision must be made about one-half of an inch behind the in¬ 
ternal border of the radius and about four inches from its upper 
extremity. 
Unfortunately, I have not had much experience with this 
operation ; but reasoning from the anatomical nerve distribution, 
and this seems to be the general concensus of opinion, it is not 
to be recommended from our present knowledge for troubles 
situated below the fetlock, such as ringbone and navicular dis¬ 
ease. It does not completely remove the sensibility on the out¬ 
side half of the foot, and hence a variable amount of lameness 
may remain because the external plantar is partly composed of 
fibres from the ulnar. 
The principal indications of this operation are lesions of 
region of the canon, such as chronic thickening, contraction and 
inflammation of the perforans, its check ligament, the perforatus, 
the suspensory ligament, and in those unremediable posterior 
splints involving the preceding structures. In the thickened and 
contracted tendons of the draft-horse it has been especially suc¬ 
cessful and rendered the horse entirely useful. 
Below is the table showing the results of several operators : 
