Adjustable drill guide with interchangeable marking hooks

A method of marking a proper location of a tibial tunnel for arthroscopic anterior cruciate ligament reconstruction using an adjustable drill guide, said drill guide comprising an outrigger in the shape of an arc of a circle having a center, an adapter slidably coupled to said outrigger, a sighting device coupled to said outrigger, said sighting device having a longitudinal axis extending toward said center of said circle, said sighting device being adapted to receive a guide pin for marking said tibial tunnel position, and a plurality of different selectable interchangeable marking hooks, each of said plurality of marking hooks having a proximal end, distal end, and a central axis extending from said proximal end to said distal end, said proximal end being mountable on said outrigger such that said central axis of said selected marking hook is disposed at a selected predetermined angle with respect to said longitudinal axis of said sighting device, said selected predetermined angle corresponding to said selected marking hook, said method comprising the steps of:

• inserting one of said plurality of interchangeable marking hooks into said adapter, each of said interchangeable marking hooks having a tip located at said distal end, said tip comprising a straight longitudinal member extending through said distal end, said tip having opposed ends projecting from opposite sides of said distal end, a first of said opposed ends extending toward said sighting device and a second of said opposed ends extending away from said sighting device, said tip being oriented at said selected predetermined angle with respect to said central axis of said marking hook;
• sliding said adapter along said outrigger to a marked position on said adapter corresponding with said selected predetermined angle;
• inserting said marking hook into a knee requiring anterior cruciate ligament reconstruction;
• advancing said sighting device towards the knee until it is directly adjacent the knee;
• inserting a guide pin into said sighting device, said guide pin being automatically aligned with said tip;
• drilling said guide pin into the knee;
• and
• removing the tibial guide, thereby leaving said guide pin in position for drilling a tibial tunnel.

A tibial tunnel guide for accurately locating a position for a tibial tunnel for arthroscopic anterior cruciate ligament reconstruction by referencing a base of a posterior cruciate ligament at an intercondylar floor, said tibial tunnel guide comprising:

• an outrigger in the shape of an arc of a circle having a center;
• a sighting device coupled to said outrigger, said sighting device having a longitudinal axis extending toward said center of said circle, said sighting device being adapted to receive a guide pin for marking a position for drilling a tibial tunnel;
• a plurality of different selectable interchangeable marking hooks, each selected one of said plurality of interchangeable marking hooks having a proximal end, a distal end and a central axis extending from said proximal end to said distal end, said proximal end being mountable on said outrigger such that said central axis of said selected marking hook is disposed at a selected predetermined angle with respect to said longitudinal axis of said sighting device, said selected predetermined angle corresponding to said selected marking hook, a tip located at said distal end, said tip comprising a straight longitudinal member extending through said distal end, and an extension disposed at said distal end and extending from said tip for abutting against the base of the posterior cruciate ligament and positioning said tip at a predetermined distance from a leading edge of the posterior cruciate ligament at the intercondylar floor;
• and
• means coupled to said outrigger for receiving one of said plurality of selectable interchangeable marking hooks, said means for receiving one of said interchangeable marking hooks being slidable along said outrigger to a marked position corresponding with said selected predetermined angle;
• wherein, when said means for receiving one of said interchangeable marking hooks is slid along said outrigger to said marked position corresponding with said predetermined angle and when said extension disposed at the distal end of said interchangeable marking hook is positioned at the base of said posterior cruciate ligament, said sighting device is automatically positioned so as to direct said guide pin to an intra-articular entry point disposed at said predetermined distance from the leading edge of the posterior cruciate ligament at the intercondylar floor.