224 DISEASES OF THE HORSE’S FOOT 
is necessary in making this last incision, in order that the 
synovial sac may not be penetrated. 
All structures showing spots of necrosis should now be 
carefully removed, either with the knife or with the curette. 
The knives most suitable for the last stages of this opera- 
tion are those depicted in Fig. 45 (c, d, and e). The 
curette, or Volkmann’s spoon, we show in Fig. 106. 
Fic. 107.—Resrction oF TERMINAL PoRTION OF THE PERFORANS. 
The horny sole and the horny frog stripped from off the 
sensitive structures. 
a, The plantar cushion ; 0, b, the plantar aponeurosis, or terminal portion of 
perforans ; c, the navicular bone ; d, interosseous ligaments of the pedal 
articulation ; ¢, ¢, semilunar crest of the os pedis ; f, inferior surface of os 
pedis ; 9, g, the sensitive lamine of the bars; h, h, bearing surface of 
the wall ; 2, 7, the sensitive sole ; k, the sensitive frog. 
When at all diseased the glenoidal surface of the navi- 
cular bone should be curetted, even to the extent of the 
removal of the whole of the cartilage. A healthy, granu- 
lating surface is thus insured. 
The above figure from Gutenacker’s ‘ Hufkrankheiten’ 
