Clean Run - August 2019 - 20

The third image is taken with a distractor appropriately placed between the
dog's legs, and the limbs rotated into
weight-bearing position. This stresses
the hip joints, and a radiograph is then
taken, which can show how lax each hip
joint is. See Figure 5.

5

All the radiographs are submitted for
verification and measurement. A distraction index (DI) is calculated by the
distance between the head of the femur on the second and third images.
This DI is calculated for each hip. It is a
number between 0.0 and 1.0. The lower
the number, the tighter the hip and the
less the risk of development of arthritis
in the dog's lifetime.
That DI is then compared to all dogs
of the same breed in the database. So,
for breeding selection, we can choose
tighter hips overall and over time, improve the breed average. For example,
with nearly 20,000 Golden Retrievers in
the database, the breed average is 0.54.
This puts them on average for moderate
risk of developing arthritis. But not every dog will.

PennHIP distracted
view radiograph

6

Musculoskeletal Ultrasound
We can evaluate the hip area in further
detail with musculoskeletal ultrasound.
This test allows us to view the area in
dynamic positions, as opposed to static
(radiographs, CT, or MRI). Once we have
confirmed and measured the laxity in
the joint, subtle changes can be appreciated on ultrasound before they can be
seen on radiographs.
Ultrasound of the hip needs to be done
under sedation. We can evaluate the
iliopsoas insertion tendon onto the femur, and also the hip joint. In the longitudinal view, we can appreciate synovial
thickening (as compared to the other
side). In a cross-sectional view, we can
evaluate the hip joint for irregularities of
the cartilage, as well as evaluate for effusion (increased joint fluid). We can also
accurately measure the amount of effusion in the joint and compare it to the
other side.
In Figures 6 and 7, we can see two images of normal hips on ultrasound and
two abnormal images.

20

Normal longitudinal view and cross-sectional view

7

Abnormal longitudinal view and cross-sectional view

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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