Tendon sheath removal is most commonly seen in stenosing tenosynovitis surgery, where the tendon may be slightly damaged, but generally not to the point of affecting the function of the thumb. Tendon sheath is a synovial capsule wrapped around the outside of the tendon, which can be divided into two layers, the fibrous layer and the synovial layer, and plays the role of fixing, lubricating and protecting the tendon. When the thumb is overused, repeated friction and irritation of the tendon causes an inflammatory reaction, resulting in a narrowing of the tendon sheath and affecting the tendon’s movement, i.e. stenosing tenosynovitis, and common symptoms include thumb popping, pain, and stiffness. Surgery for stenosing tenosynovitis is to loosen the compression of the tendon sheath on the tendon and remove the tendon sheath appropriately, so as to restore the function of the thumb. During the surgery, there may be slight damage to the tendon, but most of the tendon sheaths can be recovered after the surgery and will not affect the function of the fingers. Surgery for stenosing tenosynovitis of the thumb is recommended to go to a regular hospital and be treated by an experienced surgeon, which is generally effective and will not cause much harm to the tendon, so there is no need to worry too much.