The Joint-Spring is a finger extension splint with adjustable tension, and can be worn even on a recently operated finger. The velcro sling cradles the distal finger without metal contact. The slide pads can be positioned directly over the joints of any size finger. The proximal wrist support is a D-ring velcro strap. Because the splint spans all finger joints simultaneously, it acts on all joints as well as all structures on the flexor surface of the finger. The force can be increased by addin