De Quervain syndrome involves the inflammation of the common tendon sheath of the abductor pollicis longus (APL) and the extensor pollicis brevis (EPB) in the region of the radial styloid process. This condition can be caused by microtraumas that occur in the course of repetitive mechanical activities and systemic diseases of the connective tissue. such as rheumatoid arthritis. The sy... https://darthomes.shop/product-category/toy-abacuses/