METHODS AND TOOLS FOR FEMORAL RESECTION IN PRIMARY KNEE SURGERY

摘要

Femoral resection tools of the present invention include a posterior condyle alignment guide, an IM rod with an adjustable valgus bushing assembly, left and right external rotation plates, an anterior sizing boom having a stylus and a pair of medial/lateral drill guide assemblies (in one embodiment of the invention the drill guide assemblies are the combination of medial/lateral extension arms and attached (detachable) proximal positioning fixtures; in another embodiment, the proximal positioning fixtures are not part of the drill guide assembly per se), a plurality of self-tapping screws, proximal positioning fixtures (apart from any positioning fixtures that may be integrated into a drill guide assembly), and different size cutting guide blocks, each adapted to fit over the proximal positioning fixtures. According to the methods of the invention, the valgus bushing is attached to the appropriate external rotation guide plate and both are attached to the posterior alignment guide. The IM rod is inserted through the valgus bushing and in the IM canal so that the assembly rests against the distal and posterior surfaces of the femur. The stylus of the sizing boom is moved over the anterior femur and a size is indicated by indicia on a vertical post of the sizing boom. The medial/lateral drill guides are moved against the medial and lateral sides of the femur and two fixation pins (self-tapping screws) are inserted through the holes in each drill guide. The drill guide assembly, sizing boom, and alignment assembly are all removed leaving only the proximal positioning fixtures and four fixation pins. Another pair of proximal positioning fixtures may be selected; and if so are slid onto the fixation pins. A cutting block is slid onto the proximal positioning fixtures. Fixation pins are used to secure the cutting block. With the cutting block in place, five resections can be performed.