Patent ID: 8348874

Claim:
A knee orthosis, comprising: an upper leg attachment; a lower leg attachment; a hinge joint extending between the upper leg attachment and the lower leg attachment; wherein the hinge joint includes: an upper arm having a first end fixed to the upper leg attachment and a second end opposite the first end, the second end including a semi-spherical surface; a lower arm having a first end fixed to the lower leg attachment and a second end opposite the first end, the second end including a semi-spherical surface that mates with the semi-spherical surface of the second end of the upper arm; a first pin extending laterally through the semi-spherical surface of the lower arm and the semi-spherical surface of the upper arm, wherein the pin pivotally couples the upper arm to the lower arm; a second pin extending laterally through the upper arm; an extension coupling having a longitudinal axis, a first end pivotally and rotatably coupled to the first pin, and a second end pivotally and rotatably coupled to the second pin, wherein the extension coupling is adapted to increase the axial distance between the first pin and the second pin a first ball joint pivotally and rotatably connects the first end of the extension coupling to the first pin and a second ball joint pivotally and rotatably connects the second end of the extension coupling to the second pin.