Extramedullary resection guide and methods

Abstract

A bone cut positioning system and associated method are disclosed. The bone cut positioning system can include a positioning assembly, including a femoral attachment member, including a tongue with at least one fixation aperture configured to be fixed to a distal end of a femur. The positioning assembly can further include a light emitter mounting member configured to receive a light emitter, a channel configured to receive a depth selector slide, and a varus-valgus adjustment member configured to adjust a position of the positioning assembly relative to the femur to achieve a desired varus-valgus angle. A flexion-extension adjustment member can be configured to adjust a flexion-extension position of the positioning assembly relative to a flexion-extension of a knee joint and a guide member can be configured to extend from the depth selector slide

1 - 20 . (canceled) 
     
     
         21 . A bone cut positioning system, comprising:
 a femoral attachment member including a base portion and a first tongue with at least one fixation aperture, the first tongue extending away from the base portion and configured to be attached to the anterior cortex of a femur, thereby providing a reference on at least one of a medial and lateral side on the anterior cortex of the femur;   a light emitter mounting member configured to receive a light emitter;   a varus-valgus adjustment member configured to adjust a position of the positioning assembly relative to the femur to a target varus-valgus angle; and   a flexion-extension adjustment member configured to adjust a flexion-extension position of the positioning assembly;   a channel;   a guide member comprising:
 at least one femoral contact surface; and 
 a depth selector slide, the depth selector slide configured to be received and move within the channel to move the guide member proximally-distally relative to the femur to cause the at least one femoral contact surface to engage the distal end of the femur to set a resection depth. 
   
     
     
         22 . The bone cut positioning system of  claim 21 , wherein the depth selector slide is configured to be magnetically coupled to the channel. 
     
     
         23 . The bone cut positioning system of  claim 21 , wherein the positioning assembly is manufactured from at least one biocompatible material. 
     
     
         24 . The bone cut positioning system of  claim 21 , wherein the femoral attachment member includes a second tongue with at least one fixation aperture configured to receive a pin for securing the femoral attachment member to the anterior cortex of the femur proximal to the distal end of the femur. 
     
     
         25 . The bone cut positioning system of  claim 21 , wherein the light emitter mounting member includes a light emitter receiving aperture configured to receive at least a portion of the light emitter. 
     
     
         26 . The bone cut positioning system of  claim 25 , further including a magnetic interface for magnetically securing the light emitter to the light emitter mounting member. 
     
     
         27 . The bone cut positioning system of  claim 26 , wherein the light emitter is configured to magnetically power on when received by the light emitter mounting member. 
     
     
         28 . The bone cut positioning system of  claim 21 , wherein the light emitter includes a laser light emitter. 
     
     
         29 . The bone cut positioning system of  claim 21 , wherein the guide member is a single-use, disposable device. 
     
     
         30 . The bone cut positioning system of  claim 21 , wherein the positioning assembly is reusable. 
     
     
         31 . The bone cut positioning system of  claim 21 , further including a flexion-extension indicator. 
     
     
         32 . The bone cut positioning system of  claim 31 , wherein the flexion-extension indicator includes a bubble level. 
     
     
         33 . The bone cut positioning system of  claim 21 , wherein at least one of the varus-valgus and flexion-extension adjustment members is configured to receive an adjustment device. 
     
     
         34 . A bone cut positioning system, comprising:
 a femoral attachment member including a first tongue configured to be attached to the anterior cortex of a femur and a second tongue configured to be attached to the distal end of the femur;   a varus-valgus adjustment member configured to adjust a position of the positioning assembly relative to the femur to a target varus-valgus angle; and   a flexion-extension adjustment member configured to adjust a flexion-extension position of the positioning assembly; and   a channel;   a guide member comprising:
 at least one femoral contact surface; 
 a depth selector slide, the depth selector slide received and movable within the channel to move the guide member proximally-distally relative to the femur to cause the at least one femoral contact surface to engage the distal end of the femur to set a desired resection level; and 
 at least two apertures, the at least two apertures configured to receive at least two guide pins configured to be attached to the femur and thereafter to receive and locate a cut guide relative to the femur after the positioning assembly including the guide member has been removed from the femur. 
   
     
     
         35 . The bone cut positioning system of  claim 34 , further comprising the at least two guide pins received by the at least two apertures and configured to be attached to the femur and thereafter to receive and locate a cut guide relative to the femur after the positioning assembly including the guide member has been removed from the femur. 
     
     
         36 . The bone cut positioning system of  claim 34 , further comprising a light emitter mounting member configured to receive a light emitter. 
     
     
         37 . The bone cut positioning system of  claim 36 , wherein the light emitter mounting member includes a light emitter receiving aperture configured to receive at least a portion of the light emitter. 
     
     
         38 . The bone cut positioning system of  claim 37 , further including a magnetic interface for magnetically securing the light emitter to the light emitter mounting member, and wherein the light emitter is configured to magnetically power on when received by the light emitter mounting member. 
     
     
         39 . A bone cut system, comprising:
 a cut guide; and   a positioning assembly comprising:
 a femoral attachment member including a first tongue configured to be attached to the anterior cortex of a femur and a second tongue configured to be attached to the distal end of the femur; 
 a varus-valgus adjustment member configured to adjust a position of the positioning assembly relative to the femur to a target varus-valgus angle; and 
 a flexion-extension adjustment member configured to adjust a flexion-extension position of the positioning assembly; and 
 a channel; 
 a guide member comprising:
 at least one femoral contact surface; 
 a depth selector slide, the depth selector slide received and movable within the channel to move the guide member proximally-distally relative to the femur to cause the at least one femoral contact surface to engage the distal end of the femur to set a desired resection level; and 
 at least two apertures, the at least two apertures configured to receive at least two guide pins configured to be attached to the femur and thereafter to receive and locate the cut guide relative to the femur after the positioning assembly including the guide member has been removed from the femur. 
 
   
     
     
         40 . The bone cut positioning system of  claim 36 , further comprising the at least two guide pins received by the at least two apertures and configured to be attached to the femur and thereafter to receive and locate a cut guide relative to the femur after the positioning assembly including the guide member has been removed from the femur.