FCP and Ununited Coronoid Process in pets - Symptoms, treatment & recovery

Fragmented Coronoid Process (FCP) or an ununited coronoid process are common causes of elbow problems in dogs. It involves a fragment of the medial coronoid process of the elbow failing to fuse properly or breaking away, causing pain, lameness, and joint wear. In cats, FCP or an ununited coronoid process is extremely rare and only sporadically described.

In this article, we discuss the causes, symptoms, diagnosis, treatment, and recovery from FCP and ununited coronoid process in pets.

What is FCP?

FCP stands for Fragmented Coronoid Process. An ununited coronoid process refers to a related condition in which a small piece of bone from the medial coronoid process fails to fuse and becomes loose. Both are developmental disorders and belong to the elbow dysplasia spectrum, which also includes OCD, ununited anconeal process, and joint incongruity. The resulting loose or fragmented bone leads to early-onset osteoarthritis.

Which animals are at risk?

FCP and ununited coronoid process are mainly seen in medium to large dog breeds such as the Labrador Retriever, Bernese Mountain Dog, German Shepherd, and Rottweiler. The first symptoms usually appear at a young age, between 5 and 12 months. In cats, this is a rare phenomenon and is usually the result of trauma.

Symptoms in dogs and cats

In dogs:

• Lameness of the front leg (often varying in severity)
• Pain when bending and extending the elbow
• Stiffness after rest
• Reduced muscle mass around the front leg
• Outward rotation of the lower leg/paw

In cats:

• Extremely rare
• When present: subtle lameness or stiffness, usually trauma-related

Diagnosis

Diagnosis begins with a physical examination and X-rays, but loose or fragmented pieces are often difficult to see. A CT scan provides a much clearer picture of the elbow and is now the gold standard. Arthroscopy can not only confirm the diagnosis but also be used directly to remove the loose fragment.

Treatment

The standard treatment in dogs is surgical, usually via arthroscopy. The loose fragment is removed, and the affected cartilage is treated to limit further damage. In cases of severe osteoarthritis, a more invasive procedure may sometimes be necessary, such as an osteotomy or even an elbow prosthesis (total elbow replacement).

In cats, treatment is usually conservative (rest, pain relief), given the rarity of the condition and its generally milder course.

Recovery and aftercare

After surgery, a period of controlled rest and gradual increase in activity follows. Physiotherapy and hydrotherapy play an important role in recovery. In dogs, recovery usually takes 6 to 12 weeks, depending on the severity of the condition. The prognosis is fairly good with timely diagnosis, although there often remains a risk of osteoarthritis.

In cats, recovery tends to be faster, but clear guidelines are lacking due to the rarity of the condition.

Want to know more?

Read more about our orthopedics and rehabilitation services. Our veterinarians at Nesto have extensive experience with elbow conditions and are ready to help your pet further.

Frequently asked questions (FAQ)

What exactly is FCP?

FCP stands for Fragmented Coronoid Process, a detached piece of bone in the elbow that causes pain and osteoarthritis.

What exactly is an ununited coronoid process?

An ununited coronoid process is a loose fragment in the elbow, caused by a piece of the medial coronoid process failing to fuse properly, which causes pain and osteoarthritis.

Is FCP more common in dogs or cats?

It is much more common in dogs, especially medium to large breeds. In cats, it is extremely rare.

How is FCP or an ununited coronoid process diagnosed?

Through physical examination, X-rays, and especially CT scans. Arthroscopy can confirm the diagnosis and provide treatment at the same time.

What treatments are available?

Arthroscopic removal of the fragment is usually chosen. In severe cases, more extensive surgery is needed. In cats, conservative treatment is generally preferred.

What is the prognosis after treatment?

The prognosis is relatively good with early treatment, but there remains a long-term risk of osteoarthritis.