Septic Arthritis in Dogs
What is septic arthritis?
Septic arthritis occurs when bacteria or another infectious agent is introduced into one or more joints, leading to painful inflammation. In general, medium to large dogs are most commonly affected, and while any age dog can develop septic arthritis, this condition is seen most often in dogs 4 to 7 years of age.
The signs of septic arthritis include heat, swelling, and pain in one or more joints. There will typically be decreased range of motion in the affected joint(s), as well as fever, lethargy, and lack of appetite.
What kinds of infectious “bugs” cause septic arthritis?
Bacteria that can live and grow in the presence of oxygen (aerobes), bacteria that can live and grow in the absence of oxygen (anaerobic bacteria), and fungal organisms can all cause septic arthritis.
Are there any specific risk factors that set the stage for septic arthritis?
There are some factors that can make a dog more vulnerable to septic arthritis. For example:
- Diseases that suppress the immune system, such as diabetes mellitus (also known as sugar diabetes) and Addison’s disease (under-active adrenal glands).
- Medications that suppress the immune system.
- Trauma that penetrates a joint.
- Surgery involving a joint.
- Osteoarthritis, other joint damage, or injections into a joint.
How is septic arthritis treated?
If a dog with septic arthritis is very ill, he will be hospitalized and treated however necessary to stabilize him. The veterinarian will extract joint fluid for bacterial culture, and may lavage (flush) the joint to minimize joint damage. Some dogs with septic arthritis require surgical opening of the joint, removal of abnormal tissue, and copious lavage. Occasionally, a flushing catheter may be placed to provide access to the joint for post-operative flushing.
Once home, these dogs benefit from long-term management. Cold packs alternated with heat packs may be beneficial by increasing blood flow and decreasing inflammation and swelling. Activity should be restricted until cleared by your veterinarian.
Your veterinarian may prescribe a broad-spectrum antibiotic while waiting for the results of the bacterial culture and sensitivity panel. Once the best choice of antibiotic is made, the medication will typically be given for at least 4 to 8 weeks. In addition, a non-steroidal anti-inflammatory drug (NSAID) may be given to relieve pain and inflammation.
What follow-up care might be needed for my dog?
It will be important to watch for the return of joint pain and swelling. There may be a need for microscopic evaluations of joint fluid to monitor response to therapy. Physical rehabilitation techniques may speed healing and help prevent joint degeneration.
Be aware of the potential for degenerative joint disease, recurring infection, limited range of motion in the affected joint(s), bone infection, or generalized infection that spreads to other areas of the body from the infected joint. Long-term antibiotics may be required.
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