Degenerative Joint Disease in Cats

Degenerative joint disease (DJD), also called osteoarthritis (OA), is a chronic condition where the tissues inside and around a joint gradually break down. Cartilage becomes damaged, the joint lining becomes inflamed, and the body may form bony changes around the joint. In cats, this process can affect the hips, elbows, knees, ankles, spine, and other joints. It is painful, progressive, and often underrecognized because cats are very good at masking discomfort.

DJD is especially common in older cats. Merck notes that osteoarthritis is common in cats and may go unnoticed because they hide signs of pain, and reports suggest roughly 60% to 90% of older cats are affected. VCA reports that about 90% of cats over 10 years old have OA in at least one joint, while Cornell describes radiographic evidence in many senior cats and emphasizes that younger cats can be affected too. That means a cat does not need to limp dramatically to have meaningful joint pain.

For many pet parents, the biggest clue is not obvious lameness. Instead, a cat may stop jumping onto favorite surfaces, hesitate before using stairs, sleep more, avoid play, or seem less social. Some cats become irritable when touched over the back or hips. Others stop grooming hard-to-reach areas, so the coat looks unkempt or matted. These changes are easy to mistake for normal aging, but they often reflect chronic pain.

The good news is that cats with DJD often improve with a thoughtful care plan. Treatment does not reverse arthritis, but it can reduce pain, support mobility, and help your cat stay comfortable at home. Your vet can help match the plan to your cat’s age, other health conditions, lifestyle, and your family’s goals and budget.

Diagnosis starts with a careful history and physical exam. Your vet will ask about changes in jumping, grooming, litter box habits, sleep, play, and tolerance for handling. During the exam, your vet may look for reduced joint range of motion, pain on manipulation, joint thickening, crepitus, and muscle loss. Because cats often tense up in the clinic, the history you provide is a major part of the workup.

X-rays are commonly used to support the diagnosis and to look for joint changes such as osteophytes, joint effusion, soft tissue swelling, subchondral bone changes, or narrowed joint spaces. Merck notes that radiographs can show these classic osteoarthritic changes. Still, X-rays do not always match the level of pain. Some cats with obvious discomfort have mild radiographic changes, while others with striking X-ray findings seem less affected at home. That is why diagnosis is based on the whole picture, not imaging alone.

Additional testing may be recommended before long-term treatment, especially in senior cats. Bloodwork and urinalysis help your vet look for kidney disease, liver disease, hyperthyroidism, diabetes, or other conditions that can affect medication choices and overall mobility. If the pattern is unusual, your vet may also discuss advanced imaging, joint fluid analysis, or referral to a specialist to rule out infection, immune-mediated disease, trauma, or cancer.

A typical initial diagnostic cost range in the United States is about $150 to $600 for an exam plus basic pain assessment, and about $300 to $900 if that visit also includes radiographs and screening lab work. Costs vary by region, sedation needs, and whether your cat is seen in general practice, urgent care, or a specialty hospital.

There is no single cause of DJD in cats. It can develop as part of aging, but age alone is not the whole story. Merck explains that joint degeneration can follow trauma, infection, immune-mediated disease, or developmental problems. In cats, the disease process is less tied to body conformation than it is in dogs, although Maine Coon cats are one breed with increased risk for hip dysplasia, which can contribute to later arthritis.

Obesity is one of the most important modifiable risk factors. Extra body weight increases stress on joints and can worsen inflammation and reduced mobility. VCA specifically notes that excess weight and obesity are strongly correlated with OA. Once a cat becomes less active because of pain, weight gain can create a cycle of worsening discomfort and further inactivity.

Previous injuries also matter. A cat that had a fracture, luxation, ligament injury, or joint infection earlier in life may develop arthritis in that joint later. Congenital or developmental issues such as hip dysplasia or patellar luxation can also set the stage for chronic joint wear. Some cats develop spinal arthritis or spondylosis as they age, which may add stiffness and pain even when the limbs seem normal.

Senior age remains the biggest overall risk factor. Cornell reports that radiographic evidence of DJD is very common in older cats, and VCA reports OA in about 90% of cats over 10 years old. Even so, younger adult cats are not immune, so a middle-aged cat who is slowing down still deserves an arthritis discussion with your vet.

Not every case of DJD can be prevented, but risk can often be reduced. Keeping cats lean throughout life is one of the most practical steps. VCA notes that allowing a cat to grow slowly as a kitten and maintaining a lean body condition into adulthood is one of the most effective ways to reduce OA risk. Healthy weight lowers stress on joints and may also reduce inflammation linked with excess body fat.

Safe activity matters too. Regular movement helps maintain muscle mass, joint support, and flexibility. Indoor enrichment, climbing options with easy access, food puzzles, and short play sessions can help cats stay active without overdoing it. For cats with early stiffness, your vet may suggest modifying activity rather than stopping it completely.

Preventing injuries can also help. Keeping cats indoors or in protected outdoor spaces reduces trauma risk from falls, fights, and vehicle accidents. Prompt treatment of fractures, luxations, and developmental orthopedic problems may lower the chance of later secondary arthritis. Good nail care and non-slip surfaces can also reduce slips and awkward landings in older cats.

For senior cats, prevention also means early recognition. Because arthritis is so common and so easy to miss, routine wellness visits become more important with age. A cat who is “slowing down” may not be acting old. They may be painful, and early support can make daily life much easier.

DJD is usually a lifelong condition, but many cats can still have a good quality of life with ongoing management. The goal is not to cure arthritis. The goal is to reduce pain, preserve mobility, and make daily activities easier. Merck notes that the outlook depends on the location and severity of disease, and on whether treatment is medical, surgical, or both.

Response to treatment varies. Some cats improve noticeably with weight loss, home changes, and one pain-control adjustment. Others need a multimodal plan and periodic fine-tuning. FDA and Zoetis materials on frunevetmab note that monthly treatment can improve mobility and reduce OA pain in many cats, but not every cat responds the same way, and your vet will want to reassess function over time.

Recovery after a flare-up may take days to weeks, especially if muscle loss, obesity, or multiple joints are involved. Cats recovering from surgery or a major mobility setback may need a longer rehabilitation period. Progress is often measured by practical home markers: easier litter box use, more grooming, better willingness to jump, improved sleep posture, and a return to social behavior.

Long-term monitoring matters because senior cats often have more than one condition at the same time. Kidney disease, dental pain, neurologic disease, and endocrine disorders can all affect comfort and treatment choices. With regular rechecks and realistic goals, many arthritic cats remain comfortable for months to years.