What causes a “trigger finger”? (snapping finger)
The tendons of the hand and foot mostly run through tendon sheaths filled with a lubricating fluid (“synovia”), which allows the tendons to glide more smoothly. Tendons are often subjected to very strong tensile forces, which is why Mother Nature created so-called “annular pulleys”: these are ring-shaped, strong bands that hold the tendons down at several points along their course on the bone, preventing them from bowing outward when they tighten (similar to the small metal rings along a fishing rod). These annular pulleys have a certain diameter, and when the gliding tendons become thickened (due to inflammation, overuse, etc.), a tendon entrapment syndrome occurs. The tendon then glides with difficulty (pain) and may even get stuck. When the affected person tries to overcome this resistance with force, the finger “snaps,” which gave this condition its name (“snapping finger” or “trigger finger”).
Treatment is almost always simple and quick to perform: the corresponding annular pulley is exposed and incised. In severe cases, partial removal may also be necessary.
The health insurance funds naturally cover the cost of the procedure.
