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Osteoarthritis, also known as degenerative joint disease (DJD), is defined as the progressive and permanent long-term deterioration of the cartilage surrounding the joints. Arthritis is the medical term for inflammation of the joints, while osteoarthritis is the term referring to a form of chronic joint inflammation caused by deterioration of joint cartilage. Older dogs are at the highest risk.
The condition or disease described in this medical article can affect both dogs and cats. If you would like to learn more about how this disease affects cats, please visit this page in the PetMD health library.
Symptoms and Types
Symptoms of DJD vary. Your dog may exhibit a decreased level of activity, occasional lameness, and a stiff gait that worsens with exercise. These symptoms may increase with exercise, long periods of inactivity, or cold weather.
There is no known cause for primary DJD. However, there are a wide variety of causes for secondary DJD, such as trauma, abnormal wear on joints and cartilage, or a congenital defect present at birth such as an improperly formed hip (also known as hip dysplasia).
Causes of secondary DJD in dogs may include abnormal development of the hip or elbow (hip or elbow dysplasia), dislocation of the kneecap or shoulder, and osteochondritis dissecans (OCD), a condition in which the bone and cartilage develop abnormally so that a flap of cartilage develops within the joint.
Obesity is another factor for DJD, as it increases stress on joints. In addition, dogs with disorders such as diabetes, prolonged steroid treatment, and hyperlaxity (an excessive looseness of the joints) may also be at higher risk for DJD.
A diagnosis of DJD may be done based on an assessment of historical symptoms, such as decreased activity or stiffness, as well as a physical examination which will reveal a decreased range of motion, stiff-legged gait, deformity of the joints, and swelling or pain in the joints.