Ch 57 - Hip Luxation Flashcards

1
Q

What are the primary hip joint stabilisers?
How many have to be damaged for luxation to occur?

A

Primary Stabilisers:
- Ligament of the head of the femur
- Joint capsule
- Dorsal acetabular rim

2 of 3 need to be damaged for joint luxation

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2
Q

What are the secondary stabilisers of the hip?

A
  • Acetabulum labrum
  • Transverse acetabular ligament
  • Hydrostatic pressure
  • Periarticular muscles (gluteals, iliopsoas, quadratus femoris, gemelli, internal obturator, external obturator)
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3
Q

What percentage of joint luxations does the hip joint account for?

A

90%

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4
Q

What percentage of hip luxations are bilateral?

A
  • 6% in dog
  • 9% in cat
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5
Q

What percentage of hip luxations are craniodorsal?

A

75%

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6
Q

How does a dog with craniodorsal hip lux classically hold its leg?

A

Externally rotated and adducted, usually NWB

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7
Q

In what position does an Ehmer sling hold the leg?
What is the relux rate after a closed reduction and Ehmer?

A

Flexes the hip, abducts and internally rotates the femur

Reluxation 15-71%

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8
Q

What method are available to augment a closed reduction?

A
  • Ehmer sling
  • Hobbles
  • Ischioilial pinning
  • ESF
  • Transarticular pinning
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9
Q

What is the overall success rate with open reduction?
What are the available options?

A

Overall success 85%
- Capsulorrhaphy (83-90%)
- Prosthetic ligament technique (66-100%)
- Transposition of greater trochanter (84%)
- Transarticular pinning
- Toggle-rod (81%, relux 6-11%)
- Fascia lata loop stabilisation
- Transposition of sacrotuberous ligament
- Extra-articular iliofemoral suture

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10
Q

What is the recommended screw position for synthetic capsule technique?

A
  • Left: 10 and 1 o’clock position on DAR
  • Right: 11 and 2 o’clock position on DAR
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11
Q

List options of ventral augmentation after open reduction of ventral hip lux

A
  • Autogenous iliac crest shelf graft
  • Extracapsular sling
  • Internal fixator plate to augment ventral acetabular rim
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12
Q

What % of dogs will have progression of OA after a hip lux?

A

55-62%

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