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PDN Block - Coggle Diagram
PDN Block
areas blocked
navicular bone
coffin joint
navicular bursa
sole
caudal heel
disorders improved
sole bruises
contusion caused by impact
hemorrhage to colar cornium
aka "corn"
risk factors
shoes
too small
not extending far back enough
outgrown
long-toe/low heel conformation
flat and/or thinned soles
hard/rocky ground
often affects several feet
exam findings
hoof tester positive, specific area
increased digital pulses
sole discoloration
treatment
phenylbutazone (NSAIID)
eliminate shoeing problems
apply caustic agent to toughen the sole
iodine
formalin
apply pad
apply wide-wbbed show to support foot
hoof abscess
common across all ages, sex, breed
risk factors
moist environment
previous laminitis
recent shoeing
flat sole
sole bruise
white line disease
penetrating wound
lamenesses
sudden and severe
non-weightbearing
unilateral
exam findings
hoof tester positive
focal
all-over
black spot on sole
"gravel" (draining tract at coronary band)
warm foot
bounding digital pulse
distal limb swelling
on rads
+/- gas
bone involvement
nerve blocks
improves
abaxial sessamoid
lateral/medial PDN
do unilaterally
treatment
soak and paring to drain
hoof bandage
laminitis
acute
disease of adult horses
wide range of causes
can be unilateral or bilateral
exam findings
increased heat near coronary band
pounding digital pulses
hoof tester positive
reluctant to stand on affected foot
sawhorse stance
on rads
changes in angle b/w hoof wall and dorsal surfae of P3
flattening of ledge on top of coronet
treatment
focus on likely pathophysiology
NSAIDs
limit walking
decrease swelling
support the coffin
encourage blood flow
surgery to realign rotated coffin bone
minimize further trauma
chronic
ponies more at risk thanks to...
PPID
insulin resistance
recurrent forelimb lameness
exam findings
dished foot
founder rings
widening of white line on solar surface
changes in position of cofin bone on rads
broken forward hoof pattern axis
chronic pain
chronic abscesses
improves with palm-digit or base-sessamoid nerve block
treatment same as ac
narrow heels/frog
frog width <2/3 length
looks like frog is squished b/w bars of the wall
look for signs of navicular syndrome
high risk
Quarter horses and their relations
types with small feet
long toes
low heels
treatment/farrier
manage heel pain
trim to widest part of frog
pour-in pad doe the frog
increase show size if needed