Patent ID: 7156853

Claim:
An apparatus for measuring a joint gap and ligament balance between an osteotomized surface at a distal end of a femur and an osteotomized surface at a proximal end of a tibia, said apparatus comprising: a base; a first engaging member for an engagement with said osteotomized surface at the proximal end of the tibia; a first arm obliquely connecting said base and said first engaging member to have a structure in which said base is configured to be positioned outside an area right in front of the tibia; a moving body; a second engaging member for an engagement with said osteotomized surface at said distal end of the femur, said second engaging member being rotatable about an axis substantially parallel with respect to said osteotomized surface at the distal end of the femur; a second arm obliquely connecting said moving body and said second engaging member to have a structure in which said moving body is configured to be positioned outside an area right in front of the femur; said base and said moving body being connected with each other so that the first and second engaging members are selectively moved between a direction where the first and second engaging members are moved toward each other and a direction where the first and second engaging members are moved away from each other; a driving member configured to drive said moving body with respect to the base so that the first and second engaging members are moved in the direction away from each other; a stopper provided on the moving body and configured to engage with the driving member to restrain movement of the driving member in the direction where the first and second engaging members are moved toward each other; a first indicator configured to indicate a value corresponding spacing between the first and second engaging members; and a second indicator configured to indicate a value corresponding an angle between the first and second engaging members.