Knee orthosis

An orthosis for stretching tissue around a knee joint of a patient between upper and lower leg portions, the knee joint and the upper and lower leg portions defining on one side of the knee joint an inner sector which decreases in angle as the knee joint is flexed and defining on the opposite side of the knee joint an outer sector which decreases in angle as the knee joint is extended, comprising:

• a first arm member affixable to the upper leg portion and including a first extension member extending therefrom;
• a second arm member affixable to the lower leg portion and including a second extension member having an arcuate shape extending therefrom;
• a third arm member interposed between the first and second arm members and including a third extension member having an arcuate shape extending therefrom,
• wherein the third arm member is slidingly connected to the first extension member and the second extension member is operatively connected to the third member and travels along an arcuate path defined by the second extension member when the second arm member is moved from a first position to a second position relative to the third arm member;
• and
• a drive assembly on the third arm member, the drive assembly engaging the second extension member for selectively moving the second arm member with respect to the first and third arm members.