ICVA Equine Lameness and Neurology 3

Question 1

What is the primary action of the deep digital flexor tendon (DDFT) in the equine foot?

Accepted Answer

Flexion of the coffin joint and support of the navicular bone

Answer

The DDFT flexes the coffin joint and wraps around the navicular bone, placing it under significant tension during weight-bearing.

Question 2

Fibrotic myopathy in horses most commonly affects which muscle group?

Accepted Answer

Semitendinosus and semimembranosus

Answer

Fibrotic myopathy most commonly affects the semitendinosus and semimembranosus muscles, resulting in a characteristic gait abnormality.

Question 3

Which diagnostic finding is most consistent with a diagnosis of botulism in horses?

Accepted Answer

Progressive flaccid paralysis with preserved consciousness

Answer

Botulism causes flaccid paralysis by blocking acetylcholine release at neuromuscular junctions, while mental status remains normal.

Question 4

During a lameness examination, a positive response to flexion of the distal limb (distal limb flexion test) indicates disease in which region?

Accepted Answer

Fetlock, pastern, or foot

Answer

Distal limb flexion stresses the fetlock, pastern, and foot joints, so exacerbation of lameness suggests pathology in those areas.

Question 5

Which radiographic view is most useful for evaluating the palmar aspect of the navicular bone for lysis or cyst formation?

Accepted Answer

Dorsoproximal-palmarodistal oblique (skyline) view

Answer

The dorsoproximal-palmarodistal oblique (skyline) view provides an en face projection of the navicular bone's flexor surface.

(ICVA) International Council for Veterinary Assessment Practice Test