WOUNDS 215 



most wounds of the foot. When detected, it calls for 

 immediate surgical interference in the shape of removal 

 of the horn of the sole or the frog, as the case may be. 

 This we shall consider further under the treatment. 



(b) Separation of the Homy Frog. — This is a sequel to 

 pus formation in the sensitive structures immediately be- 

 neath it, and the condition makes itself apparent by a line 

 of separation between the horn and the skin of the heel of 

 the injured side. 



(c) Wounding of the Plantar Aponeurosis. — This occurs 

 when a moderately-deep penetration of the horn of the 

 middle zone has taken place. It is always most painful, 

 especially when complicated by necrosis. The heels is 

 then persistently elevated, and lameness is extreme, in 

 some cases so severe as to cause the leg to be carried alto- 

 gether. 



In favourable cases the necrosed piece of tendon is 

 sloughed off by the process of suppuration, and escapes 

 with the discharges from the wound. There is then an 

 abatement in the symptoms, and recovery is rapid. 



Commonly, however, on account of the non-vascularity 

 of the structure of the tendon, the necrotic spot in it tends 

 to spread. The wound is thus led to become fistulous in 

 character, and the pus forming within it prevented from 

 escaping from the original opening. As a result, lameness 

 and fever persist. There is a gradual increase in the 

 severity of the symptoms, and later fistulous openings 

 appear in the hollow of the heel. 



(d) Puncture of the Navicular Bursa. — This results from 

 a prick in exactly the same position as that last described, 

 and means that the penetrating object has gone deeper. It 

 may be distinguished from puncture of the plantar aponeu- 

 rosis alone by the fact that there is an excessive discharge 

 of synovia from the wound. This, as it escapes, is at first 

 clear and straw-coloured. Later it becomes cloudy and 

 flaked with pus, and shows a tendency to coagulate in yel- 

 lowish clots. 



Pain and accompanying fever is most marked, much 



