114 LAMENESS IN THE HORSE. 



Palpation. — Crepitation can usually be detected on careful 

 palpation, and the torn-off piece of the bone is frequently 

 felt on the end of the tendon of the gastrocuemii. There is 

 always marked pain on manipulating the injured parts. 



Dlferential Diagnosis. — Rupture of the tendo-Achilles 

 oflfers allied symptoms. The main point of difference lies 

 in the fact that, on palpation, crepitation aud decided pain 

 are brought out in the fracture, and a piece of the os calcis 

 can usually be felt on the end of the tendon of the gastroc- 

 nemii. 



FBACTURE OF THE ASTRAGULUS. 



Inspection. — Severe lameness, followed by swelling about 

 the astragulo-tibial joint. 



Palpation. — The soft and yielding swelling is very painful. 

 Excessive mobility, particularly abduction and adduction, 

 as well as rotation, may be present. When the hock joint 

 is encircled by the hands and the phalanges moved to and 

 fro, crepitation can occasionally be felt. 



Differential Diagnosis. — Sprain of the hock joint. The 

 fact that this is very rare, the subsequent improvement, the 

 absence of crepitation and abnormal mobility, diff'erentiate 

 it from fracture of the astragulus. 



SUBFACIAL CELLULITIS. 



The history, aud the traces of a recent injury, as stabs 

 with a manure fork, etc.; the presence of swelling of the 

 regional lymph glands will exclude errors. 



FRACTURE OF OTHER BONES OF THE TARSUS. 



This is somewhat rare. The abnormal mobility, chiefly 

 abduction and adduction, the very perceptible crepitation, 

 the inability to support weight, and the pain on manipula- 

 tion of the injured region, will at once establish the diagnosis 



