Coil springs placed laterally to the PIP joint move with the joint to increase PIP extension, reducing tightness in the PIP joint and the surrounding soft tissue from fl exor tendon tightness, fl exion contractures and boutonniere deformity. For contractures up to 45Ô that feel elastic when stretched. Contoured proximal and distal pads distribute pressure evenly. Splint does not shift position as fi nger moves. For size, measure from distal palmar crease to distal fi nger crease.