Hindlimb Lameness- Stifle Joint Flashcards

1
Q

What is the most common cause of Hindlimb lameness in dogs?

A

Cranial cruciate ligament disease

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2
Q

Are there any predispositions to Cranial cruciate ligament disease?

A

Can occur in any breed (but not really greyhounds lol)
But neutered females and obese dogs generally more at risk

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3
Q

What are the three types/ causes of cranial cruciate ligament disease?

A

Traumatic avulsion
Traumatic rupture
Degenerative Weakening (this is the major pathogenesis)

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4
Q

What disease can Cranial Cruciate Ligament Disease lead to?

A

Arthritis because the joint becomes unstable

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5
Q

What is the role of the Cranial Cruciate Ligament? (3)

A

Knee stability
Allows craniotibial translation (internal rotation)
Also stops the stifle joint falling backwards by attaching the front and back of the joint together

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6
Q

50% of dogs with Cranial Cruciate rupture also have damage to the …

A

Meniscus (medial)

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7
Q

What do the Meniscus have that allow load bearing/ shock absorbtion?

A

Collagen fibre arrangement converts compression into tension

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8
Q

Where do the Meniscus attach?

A

Medial- attaches to the Tibia
Lateral- attaches to the femur

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9
Q

How will an animal with Cranial Cruciate Ligament Disease present?

A

Lameness or non weight bearing with an unwillingness to flex the stifle
May sit with the leg extended or out to the side

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10
Q

What are we paying attention to when examining the stifle? (5)

A

Effusion- should be firm with clear ligament boundaries- if not then suggests fluid
Medial Buttress- feel medial side of femur- if one side is bigger it suggests fibrous tissue deposition
Patellar Tracking
Range of Motion
Pain

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11
Q

What two tests do we perform on the stifle to assess stability of the joint?

A

Cranial Draw (sliding of the patella)
Tibial Thrust (mimics walking)

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12
Q

What diagnostic tests can we undertake to diagnose Cranial Cruciate Ligament Disease?

A

Radiographs- multiple views!
MRI/ Contrast CT
Arthroscopy for surgical confirmation

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13
Q

How should we treat Cranial Cruciate Ligament Disease?

A

Conservative management (not preferred)- if no response after 8 weeks than surgical stabilisation
Dogs with meniscal injuries definitely need surgery!

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14
Q

What three types of surgery can we perform to correct Cranial Cruciate Ligament Disease?

A

Intra articular
Extra articular
Osteotomy

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15
Q

Briefly describe the process of Intra articular surgery to treat Cranial Cruciate Ligament Disease?

A

It’s a type of Graft through the bone tunnels- Take fascia from inside the joint, run it through the tunnels and fix it with screws

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16
Q

How does Extraarticular surgery differ from Intraarticular?

A

Extraarticular- Band is placed on the OUTSIDE of the joint- it remains and provides stability until scar tissue forms
This method is preferred over Intra articular!!

17
Q

What material is used for Extra articular surgery and how long does it last?

A

Metal wire e.g. Nylon
Breaks in 6-8 weeks

18
Q

What is the aim of an Osteotomy to correct Cranial Cruciate Ligament Disease?

A

works on the basis that the femoral condyle is like a ball rolling down the tibial slope so if you flatten the slope then the knee is more stabilised and the tibial thrust neutralises

19
Q

What is the prognosis of an Osteotomy?

A

Has a more rapid return to function than other surgeries especially for large breeds
But it is an advanced surgical technique

20
Q

What should we warn owners about after we have treated the initial Cranial Cruciate Ligament Disease? (2)

A

50% of dogs will get a bilateral rupture in the next 2 years
And Osteoarthritis will progress irrespective of treatment

21
Q

What is a patella luxation?
Is it developmental or congenital?

A

Abnormal tracking of the patella
Developmental disorder

22
Q

What can cause the patella luxate? (3)

A
  • Problems with quadricep mechanism- could be due to hip/femoral neck development which causes the quads to deviate
  • Uneven pressure on the physes which alters growth dynamics
  • Boney deformation
23
Q

How common are patella luxations in domestic/ pet species?

A

Common cause of INTERMITTENT lameness in young, small dogs
Can occur in cats but usually not clinical because cats have very mobile patellae

24
Q

What is the key clinical presentation of a patella luxation?

A

Skipping Lameness- intermittent non weight bearing

25
Q

On a clinical examination, what would we expect to see if the animal has a patella luxation?

A

Muscle atrophy with possible effusion
No tibial thrust or cranial draw
If you can push patella out of groove- abnormal
Retropatellar/ luxation pain

26
Q

Briefly explain how we grade a Patellar Luxation.

A

Grades I- IV with IV being most painful and severe
With I being the patella returns in normally after being pushed out
II- Stays out when pushed out
III- When patella is out normally but can be returned in with force
IV- when patella is out normally and cannot be returned in at all

27
Q

When would we NOT perform surgery in cases of patellar luxation?

A

Low grade luxation’s- with no lameness, discomfort or highly infrequent skipping lameness

28
Q

When is surgery indicated to fix a patellar luxation?

A

All Grade IV’s and III
Or mild luxation’s that have pain, pressure and frequent lameness

29
Q

What can we do surgically to deepen the groove of the patella?
Give 2.

A

Trochleoplasty- rasp off cartilage, but can encourage fibrocartilage formation
Chondroplasty- elevate cartilage flap to remove underlying bone (only animals <6months old)
Wedge Recession Sulcoplasty- Cartlidge and bone removed
Block recession Sulcoplasty- like wedge recession but do a whole block -better results but difficult to perform

30
Q

What may we also have to perform whilst the patient is undergoing surgery to fix the patellar luxation?

Hint- think ligaments to better aid outcome

A

Tibial Tuberosity Transposition- straighten femur and tibia with pin and tension band wire

31
Q

What sutures are used to tighten and close the surgical sight in a tibial tuberosity transposition?

A

Modified mayo mattress suture- basically one tissue is sutured over the other to provide stability

32
Q

When is a tibial tuberosity transposition contraindicated and why?

A

In skeletally immature patients (younger than 10 months)- may lead to abnormal distal positioning of the patellar tendon and therefore patella fractures later in life