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| Dog Hip Dysplasia |
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Hip dysplasia
Description:
Hip dysplasia occurs when there is
insufficient stability to keep the head of
the femur (the "ball") within the acetabulum
(the "socket") of the hip joint. This may be
due to stretching of the joint capsule or
weakness in the surrounding muscles, or a
failure of the "socket" to develop properly.
Because of this instability the hip joint
develops abnormally, remodelling of the bones
occurs and new bone is deposited around the
joint (used to be called arthritis - now
called degenerative joint disease). The
result is hindleg weakness, pain and
functional disability.
Cause:
It may surprise people to learn that the
cause of hip dysplasia is not known ! Hip
dysplasia is a complex (called polygenic or
multigenic) disease with many factors
involved in the cause. The most important are
genetic and environmental factors but, based
on detailed analysis of inheritance in German
Shepherd dogs the disease is only described
as being moderately heritable in that breed.
Contributing factors are :
Breed - genetic inheritance, BUT specific
genes not yet identified. Also multiple genes
involved (polygenic).
Body size - low prevalence - ancestral dog
size; greater prevalence -large/giant breeds
Body type - low prevalence - slender and fit.
Low subcutaneous fat content (1-2%); greater
prevalence- giant breeds, heavy conformation,
with acromegaly. Relatively high subcutaneous
fat content(5-10%).
Growing pattern - rapid growth rate and
excessive weight gain (above the average for
the breed) can both increase the likelihood
of hip dysplasia occurring.
Increased activity has been associated with
increased likelihood of developing hip
dysplasia. Possibly increased activity
exposes the animal to increased chance of
injury, or to excessive biomechanical forces
which alter the stability of the hip joints.
Muscle disorder - a muscle disease
(developmental myopathy of the pectineus
muscle) has been described in German Shepherd
puppies with hip dysplasia, but a direct link
between the two conditions was not proved,
though it may have been present.
Hormone - experimentally a female hormone
(the oestrogen relaxin) can induce hip
dysplasia due to relaxation of supporting
ligaments in dogs, including greyhounds.
However there is no evidence of a naturally
occurring role for the hormone in the cause
of the disease.
Diet does not seem to be important except
when excessive calorie intake occurs
resulting in too rapid a rate of growth or
excessive weight gain.
Breed Occurrence:
Hip dysplasia affects humans (1.3 children in
every 1000) and ALL domestic animals
including cats and dogs. Body size is an
important factor and one of the of the
highest prevalence's of the disease is in
large and giant breeds of dog in which over
30% of some breeds may be affected. The
disease is less common in dogs with a body
size similar to the ancestral dog and it is
rare in undomesticated animals.
In the USA screening XRays have indicated
that in some breeds over 20% are affected by
hip dysplasia including - in descending order
: St Bernards (43.2%), Newfoundlands (39.9%),
Bullmastiffs (34.5%), English Setters
(32.1%), Gordon Setters (32.1%), Old English
Sheepdogs (29.9%), English Springer Spaniel
(27.3%), Akita (27.1%), Chesapeake Bay
Retriever (25.7%), Golden Retriever (27.5%),
Norwegian Elkhound (25.6%), Rottweiler
(25.4%), the German Shepherd Dog (25.1%),
Giant Schnauzer(24.2%), Standard Poodle
(23.6%) and the Brittany Spaniel (22.4%).
(Reference Riser WH et al J Am Vet Med Assoc
(1974) 165:79)
Continue video #2....
Tags : Hip Dysplasia Artificial Hip. Dog Cats |
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Affichage : 749
Durée : 33 s |
| Birmingham Mid Head Resection (BMHR) Dysplasia Part 2 |
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Mr Derek McMinn implants a Birmingham
Mid-Head Resection (BMHR) femoral prosthesis
with a Birmingham Hip Resurfacing (BHR)
acetabular Dysplasia Cup. The BMHR is a
conservative alternative to hip resurfacing.
The operation is shown in detail from
beginning to end and includes questions from
orthopaedic surgeons in the USA where this
video was broadcast to live via satellite.
This video is in 18 parts and lasts approx
1.5 hours.
For more information regarding the BMHR and
Derek McMinn, visit www.mcminncentre.com.
Tags : hip resurfacing operation BHR BMHR mid-head resection Derek McMinn |
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Affichage : 1321
Durée : 300 s |
| Birmingham Mid Head Resection (BMHR) Dysplasia Part 1 |
 |
Mr Derek McMinn implants a Birmingham
Mid-Head Resection (BMHR) femoral prosthesis
with a Birmingham Hip Resurfacing (BHR)
acetabular Dysplasia Cup. The BMHR is a
conservative alternative to hip resurfacing.
The operation is shown in detail from
beginning to end and includes questions from
orthopaedic surgeons in the USA where this
video was broadcast to live via satellite.
This video is in 18 parts and lasts approx
1.5 hours.
For more information regarding the BMHR and
Derek McMinn, visit www.mcminncentre.com.
Tags : hip resurfacing operation BHR BMHR mid-head resection Derek McMinn |
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Affichage : 1420
Durée : 300 s |
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