Clean Run - August 2019 - 18

We do an MRI of the lower spine and find
the discs, spinal cord, and nerves to be
normal. So, we ultrasound the iliopsoas
and find minor tendinopathy. In some
case, this is the primary problem, but in
other cases, it is a consequence. But we
treat the iliopsoas and go through rehab.
The dog gets better, so we go back to athletic training, but the dog has the same
problem again. Now, what do we do?

As a puppy grows, the snug fitting ball helps to shape the socket, much like molding
Play-Doh. As the dog develops over the first few months of life, the socket won't develop appropriately if there is laxity in the joint. The lax femoral head does not provide
contact to shape the acetabulum, and the result is hip dysplasia. See Figure 2. But not
every hip dysplastic dog will develop arthritis.
2

The Hip Joint
Let's look at the hip in more detail. Like
us, the canine hip joint is a "ball and
socket." The femoral head (ball) and acetabulum (socket) are dependent on
each other for proper formation. It has
a normal range of motion of almost 200
degrees (flexes to 40 degrees, extends
to almost 160 degrees). See Figure 1.
That joint has a joint capsule (synovium)
that goes from the acetabulum (socket)
to the femoral head (ball). That synovium provides the nutrition to the joint
and protects the cartilage.
1

Radiograph of
dysplastic and
arthritic hips

We typically appreciate arthritis on a ventrodorsal extended view (OFA-style). This
view is with the dog on its back, and we are looking for at least 50% coverage of the
femoral head by the acetabulum. See Figure 3. While this view allows for evaluation
of arthritic change, it does not display the hips in a weight-bearing position. So, an
athletic dog can look normal in this radiograph, but still be having problems when
weight-bearing.
When the OFA-style radiograph looks normal (or sometimes before an MRI if the dog's
back does not hurt), we will do an AIS PennHIP (University of Pennsylvania Hip Improvement Program) evaluation and an ultrasound of the hip joint and iliopsoas. Let's
look at these tests individually.
3

The head of the femur sits in the acetabulum
of the pelvis and permits the motions of
the hip. Flexion is the forward motion, and
extension is the backward motion.

In this ventro
dorsal extended view
(OFA-style) radiograph
of the pelvis, we are
looking for 50%
coverage of femoral
head by the
acetabulum.

A comfortable athletic dog should be
able to extend his hip and maintain full
extension for about 5-7 seconds or more
without discomfort.
Let's say that the dog in question is on
pain meds, but still does not let us extend the hip fully; or when we do, he immediately pulls the leg back. The dog is
telling us that the hip hurts, but we have
radiographs which say it's normal. So,
who do we believe? The dog, of course,
we just need to look at the hip differently.
18

Clean Run | August 19



Clean Run - August 2019

Table of Contents for the Digital Edition of Clean Run - August 2019

Contents
Clean Run - August 2019 - Cover1
Clean Run - August 2019 - Cover2
Clean Run - August 2019 - Contents
Clean Run - August 2019 - 4
Clean Run - August 2019 - 5
Clean Run - August 2019 - 6
Clean Run - August 2019 - 7
Clean Run - August 2019 - 8
Clean Run - August 2019 - 9
Clean Run - August 2019 - 10
Clean Run - August 2019 - 11
Clean Run - August 2019 - 12
Clean Run - August 2019 - 13
Clean Run - August 2019 - 14
Clean Run - August 2019 - 15
Clean Run - August 2019 - 16
Clean Run - August 2019 - 17
Clean Run - August 2019 - 18
Clean Run - August 2019 - 19
Clean Run - August 2019 - 20
Clean Run - August 2019 - 21
Clean Run - August 2019 - 22
Clean Run - August 2019 - 23
Clean Run - August 2019 - 24
Clean Run - August 2019 - 25
Clean Run - August 2019 - 26
Clean Run - August 2019 - 27
Clean Run - August 2019 - 28
Clean Run - August 2019 - 29
Clean Run - August 2019 - 30
Clean Run - August 2019 - 31
Clean Run - August 2019 - 32
Clean Run - August 2019 - 33
Clean Run - August 2019 - 34
Clean Run - August 2019 - 35
Clean Run - August 2019 - 36
Clean Run - August 2019 - 37
Clean Run - August 2019 - 38
Clean Run - August 2019 - 39
Clean Run - August 2019 - 40
Clean Run - August 2019 - 41
Clean Run - August 2019 - 42
Clean Run - August 2019 - 43
Clean Run - August 2019 - 44
Clean Run - August 2019 - 45
Clean Run - August 2019 - 46
Clean Run - August 2019 - 47
Clean Run - August 2019 - 48
Clean Run - August 2019 - 49
Clean Run - August 2019 - 50
Clean Run - August 2019 - Cover3
Clean Run - August 2019 - Cover4
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