Iontophoresis Protocol Trigger Finger
Finger flexor tendons run along in a common sheath which lies deep to the bands of fascia in the palm. The fascia usually is not palpable unless there is some inflammation. A trigger or nodule results as a thickening of the tendon. This nodule forms an obstruction and catches on the narrower annular sheath. Motion beyond the obstruction may be passively applied, often accompanied by a snapping sensation.
Usually a small tender mass is palpable in the tendon located near the metacarpalphalangeal joint. Pathologically there is localized stenosis of the tendon sheath. The condition often occurs in the flexor tendon of the third or fourth finger and the development of the trigger is gradual and painless. Cause is usually unknown, however, trauma may be a contributing factor. Often members of the same family may be affected.
