1008 



DISEASES OP THE HOCK. 



are divided in this operation ; not infrequently the internal lateral 

 ligament is also partly out through. The above method produces 

 active periostitis and thickening of the internal ligaments of the 

 joint, which favour periarticular exostosis and union of the smaller 

 joints in a much higher degree than simple opening of the bursa and 

 Other operations. 



Bad results are rare. For a short time exostoses are actively 

 produced, but greatly diminish after a month or two, and may finally 

 leave no trace of operation. 



It is not pretended that this procedure cures all cases of spavin, 



Iivternal 



Fig. 538. — Horizontal section through the hind limb about the lower quarter of the 

 tibia, a, Tendinous portion of ext. pedis muscle ; b, tendon of flexor accessorius ; 

 d, saphenous vein ; e, ant. tibial artery ; //, anterior tibial veins ; g, ext. saphenous 

 nerve and vein ; h, posterior tibial artery and veins ; i, anterior tibial nerve ; 

 k, post, tibial nerve ; /. branches of the int. saphenous nerve. 



but the objections raised against it in no way detract from its 

 undoubted value. 



There need be no fear of using the knife, even when the exostosis 

 is small. In such cases, to make sure of sufficiently dividing the 

 periosteum, knives of greater curvature may be used ; these penetrate 

 more deeply (Fig. 537, b). Moller has often broken the knife when 

 pressing it into the bone, but never had any bad result. 



A clinique offers few chances of collecting reliable statistics of the 

 results of such operations. When the patient was not returned, 

 Moller considered the result to have been favourable, and on that 

 basis had no hesitation in describing periosteotomy as thoroughly 

 effective. Very few cases were sent back as uncured ; and amongst 



