The Back in Motion Flashcards

1
Q

Does flexion/extension at the walk increase or decrease moving from cranial thoracics to caudal lumbars?

A

Increases

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2
Q

Compare back motion at the walk to motion at the trot

A

Less spinal motion at the trot, ROM at LS junction is less at trot than at walk or canter

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3
Q

Know 4 things that contribute to extension of the back

A
  1. Contraction of the epaxial muscles
  2. Elevating the head
  3. Protraction of the forelimbs
  4. Retraction of the hindlimbs
  5. Weight of the abdominal viscera
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4
Q

How does the horse compensate for the extension caused by weight in the saddle

A

Forelimbs are more retracted, this flexes the back and compensates for the extra weight

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5
Q

Know three things that contribute to flexion of the back

A
  1. Contraction of the abdominal muscles
  2. Lowering of the neck
  3. Retraction of the forelimbs
  4. Protraction of the hindlimbs
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6
Q

How can the rider minimize the effect of their weight on the horse’s back

A

Sit just caudal to withers

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7
Q

Compare the back motion just before take-off of a good jumper and a bad jumper

A

Good – less flexion thoracolumbar and lumbosacral regions just before take-off

Bad – greater flexion

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8
Q

Three changes in back kinematics with back pain

A
  1. Decreased flexion/extension of the back
  2. Decreased axial rotation
  3. Decreased stride lenght
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9
Q

Two changes at rest induced by back pain

A
  1. Stand with 4 feet together

2. Kyphotic back

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10
Q

Four gait changes seen with chronic back pain

A
  1. Restricted hind limb action
  2. Poor hock flexion
  3. Unilateral or bilateral dragging of the toes
  4. With severe pain there may be a wide, straddling hindlimb gait
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11
Q

Bilateral hindlimb pain may originate from________

A

Axial skeleton

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12
Q

Know how unilateral back pain can affect the saddle

A

Twist the saddle to one side away from the painful side

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13
Q

Know the normal appearance of the back muscles

A

Should be convex

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14
Q

A triangle drawn from the TL junction to the tuber coxae should have what proportions?

A

Short and broad

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15
Q

Where should the LS junction be in relation to this triangle?

A

Close the the base of the triangle.

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16
Q

Subtle forelimb lameness causes what changes in back kinematics? (2)

A
  1. Increases ROM
  2. Changes the movement in the saggital and horizontal planes in an attempt to shift the center of gravity away from the lame leg
17
Q

Subtle hindlimb lameness causes what changes in back kinematics? (4)

A
  1. Induces hyperextension
  2. Increases ROM of thoracolumbar back
  3. Decreases ROM of the LS segment
  4. Changes the rotational movement of the pelvis