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Thumb muscle atrophy is the last stage of nerve injury in carpal tunnel syndrome. It is caused by chronic, severe compression of the median nerve within the carpal tunnel, which leads to atrophy of the thenar muscles. The thenar eminence refers to the bulge at the base of the thumb, which is made up of three separate muscles that control the thumb's fine motions. When the median nerve is compressed, it can no longer stimulate the muscles, leading to atrophy or wasting of the thumb muscles. This can cause permanent weakness and loss of function, such as the ability to lift the thumb out and away from the palm of the hand, which is essential for gripping and grasping large objects. Treatment options for carpal tunnel syndrome include wrist splinting, surgical decompression, and tendon transfer surgery, with early intervention being the best way to prevent long-term damage.
| Characteristics | Values |
|---|---|
| Cause | Chronic, severe compression of the median nerve within the carpal tunnel |
| Symptoms | Numbness, tingling, burning sensations, pain, loss of grip strength, loss of manual dexterity, muscle weakness, atrophy of the thumb muscles |
| Risk factors | Age, obesity, wrist/hand trauma, repetitive wrist work, pregnancy, rheumatoid arthritis, hypothyroidism, diabetes |
| Treatment | Wrist splinting, surgical decompression, functional electrical stimulation, carpal tunnel release surgery |
| Prevention | Avoid repetitive stress, use ergonomic equipment |
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What You'll Learn
Carpal tunnel syndrome
CTS can cause nerve and muscle breakdown, known as atrophy. In severe cases of CTS, there may be atrophy of the thenar eminence, which refers to the bulge at the base of the thumb, and a decrease in motor strength. The muscles around the thenar eminence shrink, and this can cause permanent weakness and loss of function. This is what hand surgeons aim to prevent when recommending and performing carpal tunnel surgery.
CTS symptoms typically start gradually and during the night. People with CTS experience numbness, tingling, or burning sensations in the thumb and fingers, particularly the index and middle fingers, and the thumb side of the ring finger. Pain may extend up the arm, and there may be a loss of grip strength and manual dexterity. If left untreated, muscle atrophy may occur as the muscles are not receiving sufficient nerve stimulation.
CTS can be treated with wrist splinting or surgical decompression. Surgery may involve tendon transfer, where an expendable tendon from another part of the hand is attached to the thumb to restore function. The recovery time for CTS depends on the severity of the condition and the effectiveness of treatment. It is possible to recover from surgical decompression within a month, but some cases of advanced CTS may not be able to make a full recovery.
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Nerve injury
Thumb muscle atrophy can be caused by nerve injury due to carpal tunnel syndrome. The median nerve, which controls movement and feeling in the forearm, wrist, hand, thumb, and fingers, is affected by carpal tunnel syndrome. This can be caused by tissue swelling inside the carpal tunnel, which puts pressure on the nerve. As a result, the sensory nerve fibres are compressed and damaged first, followed by the motor nerve fibres. This can lead to muscle atrophy, or wasting, of the thenar muscles, which are located at the base of the thumb. Carpal tunnel release surgery is often recommended to prevent permanent weakness and loss of function in the hand.
Another possible cause of thumb muscle atrophy is nerve injury due to osteoarthritis. When the first carpometacarpal joint of the wrist is immobilised using an orthosis to treat osteoarthritis, atrophy of the thenar muscles can occur. Thumb splints have been shown to result in muscular atrophy after four weeks of treatment. However, splinting can also help reduce pain and inflammation associated with osteoarthritis.
In some cases, nerve injury leading to thumb muscle atrophy can be caused by injury to the ulnar collateral ligament (UCL). This injury was first described in Scottish gamekeepers, who damaged the ligament by grasping the head of a rabbit between the thumb and first finger while pulling on its hindquarters. This chronic stress on the UCL can lead to weakening or rupture of the ligament, resulting in swelling, pain, and instability at the metacarpophalangeal (MCP) joint.
Additionally, repetitive movements of the thumb, such as abduction and adduction, can irritate the tendons of the extensor policis brevis and abductor policis longus muscles. This can cause pain at the base of the thumb, particularly during gripping. Severe tendonitis may also result in swelling overlying the tendons and tenderness at the point where the tendons cross the radial styloid.
Furthermore, certain medical conditions and treatments can contribute to nerve injury and thumb muscle atrophy. For example, non-operative treatments for nerve compression syndromes can lead to atrophy, stiffness, and progression of symptoms. On the other hand, surgical treatments may also have complications, including nerve injury, neuroma formation, and damage to surrounding structures. It is important to optimise the patient's medical status and address any systemic causes contributing to nerve compression symptoms.
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Tendonitis
Thumb muscle atrophy is the last stage of nerve injury in carpal tunnel syndrome. The thenar eminence, or the bulge at the base of the thumb, is made up of three separate muscles that control the thumb's fine motions. These muscles are supplied by the median nerve, which is affected by carpal tunnel syndrome. As pressure is put on the nerve, sensory nerve fibres are compressed and damaged, followed by motor nerve fibres. This results in permanent weakness and loss of function.
The Finkelstein test is used to diagnose De Quervain's tenosynovitis. During this test, the patient places their thumb in their palm and covers it with the fingers of the same hand, forming a fist. The wrist is then gently deviated towards the ulna, reproducing the patient's pain. Treatment for De Quervain's tenosynovitis typically involves wearing a splint and resting the wrist for several weeks. In some cases, surgery may be required to relieve pressure in the tendon sheaths.
De Quervain's tenosynovitis is most commonly caused by repetitive motions of the thumb and wrist. This can include grasping, gripping, or lifting objects, as well as playing racket sports or golf, engaging in handicrafts, or lifting children. Inflammatory diseases, such as arthritis, can also contribute to the development of De Quervain's tenosynovitis. Scar tissue from a previous injury or surgery may also increase the risk of developing this condition.
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Arthritis
Thumb arthritis, also known as basal joint arthritis or CMC arthritis, is a common condition that causes pain, swelling, stiffness, and loss of strength and motion in the thumb. It is caused by inflammation and the wearing out of the protective cartilage that covers the ends of the bones within the basal joint, located at the base of the thumb near the wrist. This wearing out of cartilage is typically due to age and use, and it can lead to bone spurs and the bones rubbing directly against each other, causing friction and damage.
Thumb arthritis is the second most common type of arthritis in the hand and is more prevalent in women than in men, typically occurring after the age of 40 or 45. Prior fractures, injuries, or trauma to the joint can increase the likelihood of developing thumb arthritis. The most common symptom is pain, particularly when pinching or gripping objects. Other symptoms include swelling, stiffness, and loss of strength and motion in the thumb, making even simple tasks difficult.
Treatment for thumb arthritis typically begins with conservative, non-surgical approaches. These include wearing a soft brace or splint to limit thumb movement and allow the joint to rest, applying ice or heat pads to the affected area, and taking anti-inflammatory medication to reduce inflammation and swelling. Occupational therapy or physical therapy can also be recommended to help regain strength and movement in the hand and thumb.
If non-surgical treatments do not provide sufficient relief, steroid or corticosteroid injections at the base of the palm or thumb joint may be considered. Injections may need to be repeated and do not stop the progression of arthritis. When the condition is more advanced and other treatments are ineffective, surgery may be an option. Surgical procedures for thumb arthritis typically involve removing some or all of a bone in the thumb joint (trapeziectomy) and reconstructing the tendon or ligament to stabilise the joint.
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Tumours
In severe cases of carpal tunnel syndrome, there may be atrophy of the thenar eminence due to denervation of the muscle and disuse atrophy. The Abductor Pollicis Brevis (APB) muscle, which is solely innervated by the median nerve, may experience a loss of motor strength. This can impair the ability to lift the thumb out and away from the palm of the hand, making it difficult to grasp large objects.
Treatment options for carpal tunnel syndrome include tendon transfer surgery, also known as opponensplasty, which involves moving a tendon from another part of the hand to the thumb to restore its function. Carpal tunnel release surgery may also be recommended in cases of persistent numbness, muscle weakness, or atrophy when conservative treatments are no longer effective.
While tumours can be a cause of thumb muscle atrophy, it is important to note that there are other factors and conditions that can contribute to this issue. Proper diagnosis and timely intervention are crucial for effective management and maintaining hand functionality.
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Frequently asked questions
Thumb muscle atrophy is the wasting away of the muscles in the thumb. It is usually the last stage of nerve injury in carpal tunnel syndrome.
Symptoms of thumb muscle atrophy include numbness, tingling, or burning sensations in the thumb and fingers, pain, and loss of grip strength.
Treatment for thumb muscle atrophy depends on the severity of the condition. In milder cases, symptoms can be managed with conservative treatments such as wrist splinting or night-splinting. In more severe cases, surgery may be required to release the transverse carpal ligament, known as carpal tunnel release surgery.
To prevent thumb muscle atrophy, it is important to address carpal tunnel syndrome early on. This may involve avoiding repetitive stress, using ergonomic equipment, and maintaining a healthy weight.
