Intersection syndrome is inflammation where two thumb tendons cross over two wrist tendons in the lower forearm, causing pain, swelling and sometimes a creaking feeling about a hand's width above the wrist.
In the lower forearm, two muscles that move the thumb cross over two tendons that bend the wrist backwards. This crossing point sits on the back of the forearm, on the thumb side, roughly 4 to 8 cm above the wrist. Repeated wrist movement can cause friction and inflammation here. The area becomes sore and swollen, and some people feel or hear a creaking or squeaking sensation, called crepitus, when they move the wrist.
Intersection syndrome is often confused with De Quervain's tenosynovitis, which also causes thumb-side pain. The key difference is location. De Quervain's pain is at the wrist itself, near the base of the thumb. Intersection syndrome pain is higher up the forearm. Getting the diagnosis right matters because treatment, including where an injection is placed, is different.
The doctor asks about your activities and any recent changes in training, then examines the forearm to find exactly where the tenderness, swelling and creaking are.
The location of tenderness is checked carefully to distinguish intersection syndrome from De Quervain's tenosynovitis and other causes of thumb-side wrist pain.
Where it helps, an ultrasound scan can show fluid or thickening at the crossing point and confirm the diagnosis.
Imaging is not usually needed. If the picture is unclear, an X-ray or MRI can be arranged by referral.
Your plan depends on what the assessment finds. These are the options we most often discuss.
Pausing or reducing the activity that triggered the problem is usually the first step. Technique or training changes can help prevent a flare when you return.
A wrist splint worn for a short period may help the inflammation settle by resting the tendons.
Cold therapy and short-term pain relief medicines may help reduce pain and swelling in the early stage.
Learn moreOnce pain settles, a graded programme to restore wrist and forearm strength may help you return to sport and lower the chance of recurrence.
Learn moreIf symptoms persist despite rest and splinting, an image-guided injection at the crossing point may be considered where assessed as suitable.
Learn moreMany people improve within a few weeks with rest, splinting and activity changes, especially when treatment starts early. Recovery time varies, and symptoms that have been present for longer may take more time to settle. A gradual, planned return to rowing, lifting or racquet sports often helps prevent a flare. Surgery is rarely needed. If symptoms persist despite treatment, the doctor can refer you to a hand surgeon for an opinion.
Both cause pain on the thumb side, but in different places. De Quervain's pain is at the wrist near the base of the thumb. Intersection syndrome pain is about 4 to 8 cm higher up the back of the forearm, often with creaking.
The creaking, called crepitus, comes from inflamed tendons rubbing where they cross. It is a common feature of intersection syndrome. It usually eases as the inflammation settles.
It is usually sensible to reduce or pause the activity that triggered it for a while. Many people can keep training other parts of the body. Your doctor can guide a gradual return and suggest technique changes.
It can recur, especially after sudden increases in training. Building up load gradually, keeping the forearm strong and checking technique may lower the chance of it returning.
No. Inflexion Clinic is a private GP clinic, so you can book directly. Book online or call the clinic on +65 8997 0659.
Our clinicians will take a proper history, examine you, and give you a clear plan on the day.