iCliniq Logo
HomeHealth articlesOrthopedician and Traumatologyintersection syndrome
Orthopedic Health

Intersection Syndrome: An Overview

Verified data
0

4 min read

Share

Outline

Intersection syndrome represents an inflammatory condition that results from increased friction. Read the article to know more.

Written byDr. Namrata Singhal

Medically reviewed byDr. Anuj Nigam

Published At January 4, 2023
Reviewed AtSeptember 16, 2024

What Is Intersection Syndrome?

Intersection syndrome refers to inflammatory tenosynovitis affecting the tendons of the first and second compartments of the dorsal surface of the forearm and wrist. The major cause of this syndrome is repeated rubbing or persistent friction between tendons and muscles of the extensor carpi radialis brevis and extensor carpi radialis longus. This repeated friction leads to the onset of the pathogenesis of tenosynovitis. The condition presents itself as a pain that progresses with the intensity of swelling of the involved tendons of the wrist.

What Is the Etiology of Intersection Syndrome?

The wrists’s first dorsal compartment includes tendons from muscles of the abductor pollicis longus and extensor pollicis brevis. These tendons take a peculiar course because they cross over the tendons of the second dorsal compartment just before reaching the extensor retinaculum and the radial styloid. Tendons of the second compartment include the extensor carpi radialis longus muscle and the extensor carpi radialis brevis.

What Is the Epidemiology of Intersection Syndrome?

Intersection syndrome tends to occur from repetitive extension and flexion. Common sports associated with the development of intersection syndrome include rowing, canoeing, skiing, racquet sports, and horseback riding. There are no reported differences in the injury pattern between males and females.

What Is the Pathophysiology of Intersection Syndrome?

Friction of the wrist tendinous compartments commonly occurs at the junction where crossing over of the first and second extensor compartments takes place, hence it has been given the name intersection syndrome. An inflammatory reaction is produced to the friction produced which causes pain and swelling of the involved tendons, hence leading to tenosynovitis.

What Is the Anatomy of Dorsal Wrist?

Knowledge of the anatomy of the dorsal wrist is essential to understanding the pathology of the intersection syndrome completely.

  • The extensor pollicis brevis and the abductor pollicis longus lie in the first compartment of the extensor musculotendinous compartment of the wrist. The posterior interosseous nerve is responsible for supplying nerve innervations to both tendons. The above two tendinous muscles create the actions of abduction and extension in the thumb.

  • The second extensor compartment is made on the dorsal aspect of the wrist by the tendons of the extensor carpi radialis brevis and the extensor carpi radialis longus. Both the tendons of the second compartment receive their supply from the radial nerve. These tendons provide essentially for the extension and abduction movements of the hand.

The abductor pollicis longus and the extensor pollicis brevis cross over or intersect, so to say, the extensor carpi radialis brevis and the extensor carpi radialis longus during their respective movements. This classic intersection of the two compartments is proximal to the tubercle of Lister at about four to eight centimeters of distance at an approximate angle of 60 degrees. Lister's tubercle is a bony prominence present on the dorsal surface of the radius that functions as a pulley.

It involves inflammation of the muscles and tendons of the second compartment of the dorsum of the wrist, which occurs as a result of repetitive rubbing and friction caused by the affected tendons. These lead to severe painful sensation, numbness, and tenderness in the wrist, with restricted movements. It is of immense clinical significance that both the two compartments mentioned above are also responsible for causing De Quervain's tenosynovitis, a painful disorder affecting the muscular tendons on the side of the thumb of the wrist. Thus it becomes critical to make a differentiation between intersection syndrome and De Quervain's syndrome.

How Common Is Intersection Syndrome?

This syndrome most commonly occurs in people involved in horseback riding, competitive rowing in boats using oars or canoes, skiing over the snow, and sports activities that include racquets, weight lifting, and gardening activities involving horseback riding. It is more frequent in females as compared to males. In addition, it has been recorded that the chances of suffering from this syndrome increase after pregnancy. It is a very rare syndrome; less than one in 100000 people develop this syndrome in a year.

What Are the Signs and Symptoms of Intersection Syndrome?

Signs and symptoms of the syndrome include:

  • The pain in the tendons of the wrist or forearm is gradually intensified.

  • Both muscle extension and muscle flexion increase the tenderness.

  • There is swelling at the point of intersection where the tendons of the first compartment crossover the tendons of the second compartment.

  • There is no overlying redness but only warmth on the affected part.

  • Crepitus is also a 'catching' or creaking sound commonly complained of by patients at the point of intersection where the fingers and wrist move repetitively with friction.

  • Uneasy movements of the wrist with pronation were more problematic than supination.

How to Differentiate Between De Quervain Tenosynovitis and Intersection Syndrome?

Intersection syndrome is usually doubted with De Quervain's tenosynovitis, but it is always necessary to differentiate between conditions since the therapeutic approach and the prognosis of both conditions are entirely different.

  • De Quervain's syndrome involves the first extensor compartment of the dorsum of the wrist. There is a stenosing tenosynovitis of the first compartment tendons. This is found more distally to the radial bone.

  • Intersection syndrome is defined by crossover tenosynovitis of the tendons of the second compartment of the dorsal surface of the wrist. The pain is more proximal and dorsal compared with De Quervain's syndrome. Crepitus is the classic squeaking sound, called crepitus, and constitutes the characteristic of intersection syndrome.

It is to be noted that the Finkelstein test is usually performed by the healthcare practitioner to differentiate the syndromes. This is a stretch test wherein the doctor asks the patient to flex the thumb toward the palm, and then bend the fingers over the thumb along with ulnar abduction or extension. Sharp, severe pain encountered on the thumb side of the wrist is suggestive of De Quervain's syndrome if present.

How Is Intersection Syndrome Diagnosed?

Diagnosis of intersection syndrome can be done based on a detailed clinical examination. Confirmatory studies such as ultrasound and MRI of the involved tendons can be performed to confirm the diagnosis. Classic imaging findings include fluid deposition at the periphery of the first and second compartment tendons.

What Is the Treatment of Intersection Syndrome?

Intersection syndrome is treated mainly with conservative approaches.

  • Stop Physical Activities: This includes stopping the sporting activities or other activities that can provoke the syndrome and thereafter, adequate rest helps solve the symptomatology of the disease.

  • Drug Therapy: Nonsteroidal anti-inflammatory or corticosteroid therapy may be helpful to help improve the situation and get rid of the pain.

  • Ice Pack: The application of ice packs can also be helpful.

  • Splints: Splints can be put in temporarily to protect the affected tendons of the wrist.

  • Surgery: Surgical intervention is rarely required.

What Is the Differential Diagnosis of Intersection Syndrome?

The conditions almost similar to intersection syndrome are Boutonniere deformity, drummer's wrist, Dupuytren's contracture, extensor digitorum tenosynovitis, jammed finger, Jersey finger, mallet finger, metacarpophalangeal ligament rupture, ring avulsion injury, and scaphoid fracture.

Conclusion

The intersection syndrome is a rare syndrome of the tendons of the second compartment of the wrist. It is diagnosed clinically and by other imaging techniques. Pain is conservatively managed and that includes cessation of provocative activities that exacerbate the symptoms. Differentiation of De Quervain's syndrome from the intersection syndrome is necessary for proper treatment of the affected.

Listen to related tracks in our music library

Frequently Asked Questions

Yes, intersection syndrome can be treated. The goal of treatment is to reduce pain and inflammation, improve the range of motion, and prevent the syndrome from recurring. Treatment options may include physical therapy, nonsteroidal anti-inflammatory drugs (NSAIDs), corticosteroid injections, rest, and immobilization. In some cases, surgery corrects the underlying cause of the syndrome.
Intersection syndrome is considered a relatively uncommon condition. It affects a small percentage of individuals who participate in repetitive overhead activities such as throwing, swimming, weightlifting, and racket sports. The exact incidence of intersection syndrome is unknown, but it is considered less common than other conditions such as tennis elbow or golfer's elbow. Nevertheless, it can still cause significant pain and impairment in affected individuals, and prompt treatment is important to prevent long-term consequences.
To treat intersection syndrome, the following steps can be taken:
 - Rest and Immobilization: Reduce or stop activities that trigger the pain to give the affected area time to heal.
 - Anti-Inflammatory Medications: Nonsteroidal anti-inflammatory drugs (NSAIDs) such as ibuprofen can help reduce pain and swelling.
 - Physical Therapy: Stretching and strengthening exercises can improve the range of motion and prevent the syndrome from recurring.
 - Corticosteroid Injections:  A corticosteroid injection reduces inflammation and pain.
 - Surgery: In severe cases, surgery cures the underlying issue causing the syndrome.
The duration varies from person to person. It also depends on several factors, such as the severity of the condition, the underlying cause, and the effectiveness of treatment. In some cases, symptoms of intersection syndrome may resolve within a few weeks with rest and proper treatment. However, symptoms may take several months to improve in more severe cases.
Surgery is not typically required for the treatment of intersection syndrome. In most cases, the condition can be successfully treated with rest, physical therapy, anti-inflammatory medications, and other conservative measures. However, surgery may be necessary to correct the underlying issue causing the syndrome in rare cases where the syndrome is severe or persistent. The decision to perform surgery for intersection syndrome is usually based on several factors, including the severity of symptoms, the underlying cause, and the effectiveness of conservative treatments.
Massage may relieve symptoms of intersection syndrome, but it is usually not the primary form of treatment. Massage can help improve circulation, reduce muscle tension, and relieve pain and discomfort associated with intersection syndrome. However, massage alone is not likely to resolve the underlying cause of the condition, and it should be used in conjunction with options such as physical therapy and anti-inflammatory medications.
Intersection syndrome occurs at the intersection of two muscle-tendon units in the forearm. Specifically, it affects the area where the tendons of the extensor carpi radialis brevis (ECRB) muscle and the extensor carpi radialis longus (ECRL) muscle cross over the tendons of the wrist extensor muscles. This area is subjected to repeated stress and strain during certain overhead activities, such as throwing, swimming, weightlifting, and racket sports. Over time, this repeated stress can lead to inflammation and pain in the affected area, resulting in the development of intersection syndrome.
Distal intersection syndrome is typically treated with a combination of rest, physical therapy, pain management, and other conservative measures. Treatment may include:
 - Rest: Avoid overhead activities that may worsen symptoms and allow the affected area to heal through rest.
 - Physical Therapy: Stretching and strengthening exercises to help improve flexibility, range of motion, and muscle strength.
 - Pain Management: Anti-inflammatory medications, ice, or heat therapy to help reduce pain and swelling.
 - Bracing or Splinting: Wearing a brace or splint to help immobilize the affected area and reduce strain during overhead activities.
Compression may provide some relief for symptoms of intersection syndrome. Compression garments, such as wrist braces or sleeves, can help reduce swelling and support the affected area. Compression can help reduce pain and discomfort associated with intersection syndrome by applying gentle pressure to the affected area. However, compression should be used in conjunction with other treatments, such as physical therapy and anti-inflammatory medications, to address the underlying cause of the condition.
Distal Intersection Syndrome is a repetitive strain injury affecting the forearm. It is caused by the repeated friction of tendons that cross the wrist against the underlying bone at the distal end of the forearm. This friction can result in the tendons becoming inflamed, leading to pain, swelling, and reduced mobility in the wrist and hand. Distal Intersection Syndrome is commonly seen in people who engage in repetitive wrist movements, such as those involved in manual labor or sports activities that require repetitive wrist motions.
Intersection syndrome typically does not cause numbness. The symptoms of intersection syndrome are usually limited to pain and tenderness in the forearm and wrist, especially where the tendons cross over each other. However, if numbness is present along with pain in the forearm or wrist, it is possible that there is an underlying nerve problem or nerve compression causing the symptoms. Numbness can also signify other conditions, such as carpal tunnel syndrome, which can cause wrist and hand pain.
Proximal intersection syndrome is a condition that affects the tendons in the upper arm and shoulder. It occurs when the tendons of the biceps brachii muscle cross over the tendons of the supraspinatus muscle and the coracobrachialis muscle. Like distal intersection syndrome, proximal intersection syndrome is caused by repetitive overhead activities, such as throwing, swimming, weightlifting, and racket sports. Over time, this repeated stress can lead to inflammation and pain in the affected area.
Source Article IclonSourcesSource Article Arrow
Dr. Anuj Nigam from iCliniq
Dr. Anuj Nigam

Orthopedician and Traumatology

Consult this doctor

Rate this article

Tags:

intersection syndrome

Related topics

Cohen Syndrome - Causes, Signs and Symptoms, Diagnosis, and Management

Nelson’s Syndrome

Cardiofaciocutaneous Syndrome- Causes, Signs, Diagnosis and Treatment

Rotor Syndrome - Symptoms, Diagnosis, and Treatment

Hepatorenal Syndrome - Causes, Symptoms, and Treatment

Turner Syndrome - Features and Treatment

Ask your health query to a doctor online

Orthopedician and Traumatology

*guaranteed answer within 4 hours

Trustpilot

Disclaimer: No content published on this website is intended to be a substitute for professional medical diagnosis, advice or treatment by a trained physician. Seek advice from your physician or other qualified healthcare providers with questions you may have regarding your symptoms and medical condition for a complete medical diagnosis. Do not delay or disregard seeking professional medical advice because of something you have read on this website. Read our Editorial Process to know how we create content for health articles and queries.