Radiology Packet 42

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Radiology Packet 42

• Navicular/Laminitis

2
14-year old Arabian MareMissy

• Hx 5 month history of forelimb laminitis.
  Lateral radiographs of each forefoot are provided
  before and after corrective hoof trimming. The
  radioopaque material on the solar surface and the
  thumbtacks have been placed to identify the
  location of the frog. This information will be
  used for the proper positioning of corrective
  shoes.

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14-year old Arabian MareMissy

• RF
• Right fore
• There is mild palmar deviation of the third
  phalanx with respect to the dorsal hoof capsule.
• A large area of gas accumulation is present along
  the dorsal wall of the hoof. The dorsal solar
  margin of the third phalanx is slightly more
  pointed in shape than normal.
• Left fore
• There is a greater degree of palmar deviation of
  the third phalanx in this foot.
• The line of gas indicating laminar separation
  extends further dorsal than in the right
  forefoot.
• Remodeling of the dorsal solar margin of the
  third phalanx is present.
• Right fore after corrective hoof trimming
• In the right forefoot the excess length of the
  hoof wall was removed.
• Left fore after corrective hoof trimming
• The entire dorsal hoof wall was removed to a
  level 2cm below the coronary band.
• The entire area of the hoof wall that was
  seperated was removed.
• RD
• Bilateral laminitis with palmar deviation of the
  third phalanx

5
11-year old Shetland pony

• Hx Presented for chronic founder. Single lateral
  views of the right front and hind feet are
  available for review.

RF
RH
6
11-year old Shetland pony

• RF
• RF
• Severe destruction of P3 is present.
• The soft tissues dorsal to P3 are massively
  thickened and distorted.
• The limb axis is upright.
• The hoof itself is markedly deformed.
• There is severe rotation of P3.
• There is osteopenia present from minimal weight
  bearing and the fetlock is swollen.
• RH
• The hoof is severely overgrown, the sole is quite
  thick.
• The soft tissue dorsal to P3 measures 13mm
  proximally, 14mm distally relative to a P3
  length of 56mm, a ratio of P3 thickness to P3
  length of 23-25 is obtained. This is within
  normal limits.
• RD
• Severe chronic laminitis with rotation and
  osteolysis of the RF P3
• Osteomyelitis of P3 could be present
• Severe lack of hoof care of the right hind foot,
  without laminitis

7
14-year old Standardbred

• Hx Horse has been walking on eggs for sveral
  days. The palmar digital pulses are pounding.

8
14-year old Standardbred

• RF
• LF
• Asymmetric thickening of the soft tissues dorsal
  to P3 and obvious rotation of P3 away from the
  hoof wall.
• The toe of P3 is flared.
• The distal interphalangeal foot axis is
  hyperflexed.
• The opaque material on the foot is iodine
  containing medication
• RF
• Changes are similar to that of the LF foot.
• The distal interphalangeal axis is slightly
  hyperflexed.
• There is an osteophyte found off the
  dorsoproximal surface of P2.
• RD
• Bilateral laminitis with rotation
• DJD of the right front proximal interphalangeal
  joint

9
13-year old Quarter Horse

• Hx Lame on the right front foot.

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13-year old Quarter Horse

• RF
• There is lucency in the cortex of the navicular
  bone indicating degenerative changes.
• There cortex of the navicular bone is thickened.
• A large bone spur is noted laterally on the
  proximal border of the navicular bone.
• Some mineralization is noted in the tendinous
  structures in this region.
• On the navicular view the large lucent defects in
  the cortex appear as cystic lesions.
• RD
• Navicular osteitis and cystic degeneration

11
2-year old Standardbred

• Hx Acutely lame left fore limb. Sound following
  palmar digital nerve blocks.

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13
2-year old Standardbred

• RF
• A linear lucency is present within the navicular
  bone, lateral of midline.
• RD
• Fracture of the left front navicular bone

14
3-year old quarter horse geldingDude

• Hx Presented for evaluation of right forelimb
  lameness. The lameness does not improve with a
  palmar digital nerve block but is 90 improved
  with an abaxial sesamoid block. Following the
  abaxial sesamoid block of the right forelimb the
  horse becomes lame on the left forelimb.

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3-year old quarter horse geldingDude

• RF
• Several large synovial invaginations are present
  on the distal border of the navicular bone.
• In the flexor skyline view the cortex of the
  navicular bone is slightly thicker than normal
  and there is a mild increase in opacity of the
  medulla of the bone.
• Several synovial invaginations are visible. They
  are of normal size but are unusually shaped.
• Osteophyte formation is present on the extensor
  process of the third phalanx.
• RD
• Degenerative change of the navicular bone
• Mild osteoarthritis of the distal interphalangeal
  joint