The flexor pollicis longus (FPL) is the only muscle in the human body that flexes the distal phalanx of the thumb at the interphalangeal (IP) joint. It runs from the anterior surface of the radius to the distal phalanx of the thumb, passes through the carpal tunnel alongside nine tendons and the median nerve, and is a key muscle involved in texting thumb and carpal tunnel syndrome.
What are the causes of De Quervain’s Syndrome?
De Quervain’s syndrome is caused by overuse of the thumb, specifically the abductor pollicis longus and extensor pollicis brevis muscles.
Signs, symptoms, and assessment (diagnosis) of De Quervain’s syndrome
Assessment / Diagnosis for De Quervain’s syndrome is done by a special orthopedic assessment test procedure known as Finklestein’s Test.
How do we treat De Quervain’s syndrome with manual therapy?
Once present, De Quervain’s syndrome (De Quervain’s disease) can be challenging to resolve, but manual therapy treatment can be very beneficial.




