Dominic Stone
Ulnar deviation is the tilting of the hand and wrist towards the little finger and ulna. This movement is enabled by the flexor carpi ulnaris (FCU) and extensor carpi ulnaris muscles, which work together to cancel flexion and extension, instead pulling towards the ulna. The FCU is the most medial flexor muscle in the superficial compartment of the forearm and is the only muscle in the anterior compartment that is fully innervated by the ulnar nerve. The extensor carpi ulnaris is one of the extensor muscles of the forearm, located in the superficial layer of the posterior compartment of the forearm.
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What You'll Learn
Ulnar deviation is caused by problems with the joints, muscles, or ligaments
Ulnar deviation is a hand deformity where the fingers are displaced towards the ulna bone on the outside of the forearm. It is caused by problems with the joints, muscles, or ligaments. This displacement is often the result of swollen metacarpophalangeal (MCP) joints, which are the big knuckles at the base of the fingers. This swelling can cause the fingers to bend abnormally towards the little finger.
Ulnar deviation can be caused by chronic inflammation of the connective tissue that supports the MCP joints, including tendons, ligaments, and cartilage. This inflammation can weaken the surrounding tendon structures, leading to finger displacement. Over time, the bones in the MCP joints may start to rub together, causing further damage and potentially resulting in bent and distorted joints.
The condition is commonly associated with rheumatoid arthritis (RA), an autoimmune disorder that targets joint tissue. Inflammation caused by RA can damage both the MCP joint and the surrounding area. This can lead to joint erosion and bone deformation, contributing to ulnar deviation. Additionally, the outer tendon structures in RA are stronger than the inner ones, pulling the fingers towards the little finger.
Other types of arthritis, such as osteoarthritis (OA), psoriatic arthritis, and lupus, can also cause ulnar deviation. Lupus, an autoimmune disease, affects the joints in the fingers and wrists and may lead to ulnar deviation over time. OA is the most common form of arthritis and can result in joint deformity and ulnar deviation. Structural congenital abnormalities, such as brachial plexus palsy, can also contribute to ulnar deviation.
Ulnar deviation can be treated with physical therapy, occupational therapy, and wrist and hand exercises to increase muscle strength and improve the range of motion. Splints and braces are also used to keep the fingers from bending further and to slow disease progression. Non-steroidal anti-inflammatory drugs (NSAIDs) can help manage pain and swelling associated with ulnar deviation.
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It can be treated with physical therapy and occupational therapy
Ulnar deviation is a condition in which problems with the joints, muscles, or ligaments cause the fingers to bend toward the ulna bone in the forearm. It is often caused by rheumatoid arthritis (RA) and results in a deformity of the hand, where the wrist shifts toward the thumb side while the fingers bend toward the pinky. While this condition does not initially impact daily tasks, it can progress to the point where it limits hand functionality over time.
Ulnar deviation can be treated with physical therapy and occupational therapy, alongside anti-inflammatory medications. Physical therapy helps to manage symptoms and improve overall health. Depending on the severity of the condition, treatment can range from simple wrist, hand, and finger exercises to wearing a splint to keep the fingers in place. A doctor may refer patients to a physical therapist or hand occupational therapist to teach them the correct way to perform these exercises.
There are various splints available to support ulnar deviation, including the Polycentric Hinged Ulnar Deviation Splint, the Radial Hinged Ulnar Deviation Splint, and the Comforter Splint, which is designed for night-time use. Oval-8 Finger Splints are another option that helps to reduce stress on the joints of the fingers.
In addition to exercises and splints, doctors may recommend home treatments such as hot or cold therapy to relieve symptoms. Applying heat to the fingers while extending them can increase the range of movement, while applying ice to the joints can help lower pain and swelling.
It is important to consult with a healthcare professional to evaluate and treat ulnar deviation, as leaving an underlying condition untreated may lead to additional complications.
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It is associated with rheumatoid arthritis
Ulnar deviation, also known as ulnar drift, is a hand deformity where the fingers lean toward the outer side of the hand, or the little finger. This is caused by chronic inflammation of the connective tissue (tendons, ligaments, and cartilage) that supports the MCP joints. Ulnar deviation is most commonly associated with rheumatoid arthritis (RA), an inflammatory autoimmune disease that causes joint inflammation and swelling in the fingers and wrists. RA affects the hand and wrist joints, damaging the surrounding tendons and ligaments, causing the bones to rotate and the fingers to be pulled out of alignment.
The radiocarpal joint is the intersection of the distal end of the radius and the proximal row of carpals. It is a true synovial joint, with a joint capsule containing lubricating fluid. The radiocarpal joint allows the hand and wrist to move up and down (extension and flexion) and also side to side (radial and ulnar deviation). Ulnar deviation occurs when the hand and wrist tilt towards the ulna, or little finger side. This movement is facilitated by the flexor carpi ulnaris and extensor carpi ulnaris muscles, which work together to cancel flexion and extension, pulling the hand towards the ulna.
RA causes chronic inflammation of the MCP joints, which damages the joint capsule and surrounding structures. This can result in ulnar deviation, causing further joint erosion. The inflammation associated with RA can also cause long-lasting pain and misshapenness of the joints. Ulnar deviation can significantly affect an individual's range of motion, including flexion and extension in the hands and wrists. This can impair the ability to perform everyday activities such as grasping objects, fastening buttons, or holding a mug.
Ulnar deviation is not the only hand deformity associated with RA. Other potential issues include Boutonnière deformity, where the middle joint of the finger stays bent while the fingertip bends back, and swan neck deformity, where the middle joint is bent back abnormally. RA can also cause hitchhiker's thumb, where the thumb joint has an abnormal range of movement, and rheumatoid nodules, which are small lumps that can form on the hands and fingers. These issues can lead to pain, lumps, clicking sounds, and numbness or tingling in the hands and wrists.
The treatment of ulnar deviation in the context of RA focuses on maintaining hand function, relieving pain, and managing the underlying autoimmune disease. Early diagnosis is crucial, as it allows for the use of splints to support the fingers, improve grip, and slow disease progression. Treating the underlying RA can also help manage symptoms and slow the progression of ulnar deviation. In some cases, surgery may be required to fix the deformity, relieve pain, and improve hand function.
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Lupus can cause ulnar deviation over time
Ulnar deviation, also known as ulnar drift, is a hand deformity in which swollen metacarpophalangeal joints (the big knuckles at the base of the fingers) cause the fingers to bend towards the ulna bone on the outside of the forearm. This condition can make simple activities like tying shoelaces or gripping small objects difficult. Ulnar deviation is often a symptom of rheumatoid arthritis, but it can also be caused by lupus.
Lupus is an autoimmune disease that can affect any part of the body, including the joints, skin, and organs. It is characterised by a wide variety of symptoms. Lupus can affect the joints in the fingers and wrists, causing ulnar deviation over time. This is due to chronic inflammation of the connective tissue (tendons, ligaments, and cartilage) that supports the MCP joints. Unlike rheumatoid arthritis, this inflammation does not cause joint erosion.
Ulnar deviation can also be caused by other diffuse connective tissue disorders (DCTDs), such as scleroderma, polymyositis, and Sjögren’s disease. Additionally, psoriatic arthritis, a type of chronic arthritis caused by the immune system attacking the joints, can also lead to ulnar deviation. Approximately a quarter of people with psoriasis have psoriatic arthritis, according to a 2019 study.
The treatment for ulnar deviation caused by lupus aims to manage symptoms and improve overall health. Doctors may recommend a long-term treatment plan, including medication to slow down the progression of ulnar deviation. Lifestyle changes, exercises, therapies, and interventions can help ease discomfort and potentially slow progression. Wrist and hand exercises can increase muscle strength and improve the range of motion.
Ulnar deviation can be diagnosed through physical examinations, blood tests, and X-rays. Doctors may observe the patient's range of motion by asking them to move, extend, or flex their hand and fingers. If left untreated, ulnar deviation may cause additional complications.
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It is a physiological movement of the wrist
Ulnar deviation, also known as ulnar drift, is a physiological movement of the wrist. It is a hand deformity in which the swelling of the metacarpophalangeal joints (the big knuckles at the base of the fingers) causes the fingers to become displaced, tending towards the little finger. The name comes from the displacement toward the ulna—the bone on the outside of the forearm. Ulnar deviation is different from radial deviation, in which the fingers are displaced toward the radius.
Ulnar deviation is often a characteristic of rheumatoid arthritis, and it can also be a symptom of osteoarthritis. It may also be caused by lupus, chronic inflammation, or problems with the ligaments or muscles in the wrist and hand. Over time, people with ulnar deviation may find certain activities, such as tying shoelaces or gripping small objects, more difficult.
Ulnar deviation can be treated with physical therapy or occupational therapy, and wrist and hand exercises may increase muscle strength and improve the range of motion. These exercises can be performed at home while wearing a splint or brace to keep the fingers from moving. It is important to speak with a doctor before trying any new exercises.
The flexor carpi ulnaris muscle (FCU) is involved in ulnar deviation. It is the most medial flexor muscle in the superficial compartment of the forearm, and it can adduct and flex the wrist simultaneously. The FCU acts in tandem with the flexor carpi radialis to flex the wrist and with the extensor carpi ulnaris to adduct the wrist. This muscle is fully innervated by the ulnar nerve, and it has a long linear origin from the olecranon and posterior border of the ulna.
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Frequently asked questions
Ulnar deviation is the tilting of the hand and wrist toward the little finger and ulna.
Ulnar deviation involves the flexor carpi ulnaris (FCU) and extensor carpi ulnaris (ECU).
The FCU is a superficial flexor muscle of the forearm that flexes and adducts the hand. It is the most powerful wrist flexor and is involved in protecting the forearm's neurovascular bundle.
The ECU is one of the extensor muscles of the forearm and contributes to both extension and adduction of the hand at the wrist. It also provides essential medial stability to the wrist.
