MS- Navicular Disorders.txt
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____________ is the most common cause of lameness in horses, especially Quarterhorses.
What are the classic radiographic signs of navicular degeneration? (5)
changes in vascular channels, enthesiophyte formation, fragmentation of the navicular bone, osteopenia of medullary cavity, palmar cortical irregularity and lysis.
With navicular degeneration, radiographs will show enthesiophyte formation at the attachment of the ____________ of the _____________and _____________.
suspensory ligament; navicular bone; distal navicular ligament
What 3 radiographic changes are more associated with lameness?
palmar cortical lysis and irregularity, DDF adhesions, enthesiophytes in the ligaments
What 3 radiographic changes of navicular degeneration may be seen in sound horses (ie. not associated with lameness)?
alterations in vascular channels, fragmentation of the distal navicular ligament, osteopenia
What is unique about warmblood horses?
have more navicular degenerative changes without lameness
In horses in training, excessive pull and motion of the DDF can result in... (4)
bone remodeling disease of the navicular bone, pain, bone resorption, bone edema and pressure
The heel soft tissues are critical to the function of the navicular bone to...
divert vector forces from the pull of the DDF.
Any horse with sensitivity to the heel area noted on hoof tester or palpation.
Lameness that blocks to the heel with a palmar digital nerve block.
heel pain syndrome
Structural degeneration of the navicular bone noted on imaging.
Lameness that blocks to the heel with navicular degeneration on radiograph.
Heel pain can be caused by... (4)
heel cracks, sheared heels, contracted heels, trush
Heel pain can be managed with... (3)
shoeing, removal of necrotic material, treating infection
Navicular syndrome may be associated with... (5)
bone cysts, palmar cortex erosions, DDF degeneration, navicular bursitis, increased size/number of vascular channels distal to the navicular bone
MRI is better than radiographs for...
visualization of bone and soft tissues (esp. soft tissues)
A navicular bone cyst will radiographically show __________ around the __________, and bruising of the ___________.
bone resorption; vascular channel; distal navicular ligament
Navicular palmar cortical erosion is associated with ___________.
How do you treat heal pain when there is no lameness?
trim away dead frog, topical antibiotic or antifungal, shoe horse to unload heels or even load sheared heels
Treat heel pain syndrome by relieving the pain from the _____________ by _______ the heel, using a ________ to support the heel, and providing an easy breakover by _____________.
pull of the DDF; raising; bar shoe; dubbing the toe
Navicular bursitis can be treated by the _____________.
streetnail surgery (cut out window for drainage and granulation tissue will form)
If there is navicular degeneration with no lameness, _____________ is necessary.
When treating navicular syndrome, shoeing is recommended to __(2)__; also provide ________ for pain; ________ is the last resort but can provide pain relief.
raise and support heel, shorten toe; NSAIDs; palmar digital neurectomy
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