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Arthritis is a complex condition
involving inflammation of one or more joints. There are many causes
of arthritis in pets. In most cases, the degree of arthritis is
related to the age of the animal. Arthritis can be classified as
primary arthritis such as rheumatoid arthritis and secondary
arthritis which occurs as a result of joint instability that
leads to damage of the subchondral bone that line the joints. Secondary
arthritis is the most common form diagnosed in veterinary patients.
The most common type of arthritis is osteoarthritis (OA) which is
also known as degenerative joint disease (DJD). Some common causes
of secondary arthritis include hip dysplasia, obesity, cranial cruciate
ligament rupture, and so forth. Other causes include joint infection,
often as the result of bites or following joint trauma and damage.
Rheumatoid arthritis is an immune
mediated, erosive, inflammatory condition. Cartilage and bone are
eroded within affected joints and the condition can progress to
complete joint fixation (ankylosis). It may affect single joints
or multiple joints may be involved (polyarthritis). In certain dog
breeds Rheumatoid Arthritis (RA) factors can be detected with blood
tests. Other types of immune mediated arthritis can be non-erosive,
such as arthritis that is associated with Systemic Lupus Erythematosis
(SLE). SLE is often accompanied by other clinical signs in addition
to the arthritis.
Infective or septic arthritis can
be caused by a variety of microorganisms, such as bacteria, viruses
and fungi. Septic arthritis normally only affects a single joint
and the condition results in swelling, fever, heat and pain in the
joint. With septic arthritis, your pet is likely to stop eating
and become depressed.
Treatment will depend on the cause
of arthritis. Immune mediated and rheumatoid arthritis are usually
treated with high doses of corticosteroids, often with dramatic
improvement. The control of these conditions often involves the
long-term use of corticosteroids and other drugs such as immunosuppressive
or cytotoxic agents. The treatment of septic arthritis involves
determining the type of microorganism involved and its antibiotic
sensitivity. Antibiotics are usually administered for a minimum
of a month and analgesics (pain relief medications) are necessary
to combat pain and inflammation.
Analgesics such as non-steroidal anti-inflammatory
drugs (NSAIDs) are the most common form of treatment for osteoarthritis.
It is important to select these medications with care since some
dogs are more sensitive than others to the potential side-effects
of analgesics. The most common side-effects of analgesics include
decreased appetite, vomiting and diarrhea. Pre- medication blood
tests must be performed to make sure that the pet can safely metabolize
and eliminate the medication and then periodic blood tests are necessary
to ensure continued safe usage.
If you have any concerns or questions
about the administration of any medication, please discuss theme
with your veterinarian.
This
client information sheet is based on material written by Ernest
Ward, DVM.
© Copyright 2005 Lifelearn Inc. Used with permission under
license. June 12, 2007
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