Patent ID: 8496711

Claim:
A knee arthrodesis implant comprising: a femur nail having a first end for insertion into a bone marrow canal of a femur and a second, opposite end having a femur nail neck; a tibia nail having a first end for insertion into a bone marrow canal of a tibia and a second, opposite end having a tibia nail neck; a collar-type module rigidly connecting the femur nail to the tibia nail, the collar-type module having two longitudinally separated half shells that when connected form a longitudinally extending passage through the collar-type module, a first end of the longitudinally extending passage receiving the femur nail neck therein and a second, opposite end of the longitudinally extending passage receiving the tibia nail neck therein; wherein the collar-type module is angled along its length, thereby allowing the femur and tibia nails to extend from the respective first and second ends of the longitudinally extending passage at an angle from one another; wherein the two half shells each comprise a plurality of corresponding recesses that extend through the half shells perpendicularly to the longitudinally extending passage; wherein each recess in the plurality of recesses receives a tensioning screw, whereby tightening of the tensioning screws holds the femur and tibia nail necks within the respective first and second ends of the longitudinally extending passage by frictional contact; wherein a resistance of the frictional contact can be adjusted by application of a certain torque to the tensioning screws, thereby controlling axial displacement and radial rotation of the collar-type module with respect to the femur and tibia nail necks, thereby allowing for gradual adjustment of extension, flexion and valgus and varus positions of a knee joint as the collar-type module is rotated to adjust the angle at which the femur and tibia nails extend from one another; wherein the collar-type module comprises first and second collar-type modules; and further comprising a module connector configured to connect the first and second collar-type modules by insertion of a first end of the module connector into a longitudinally extending passage of the first collar-type module and insertion of a second, opposite end of the module connector into a longitudinally extending passage of the second collar-type module and tightening of tensioning screws in a plurality of recesses in each of the first and second collar-type modules.