Modular femoral prosthesis system for hip arthroplasty

Abstract

A modular femoral prosthesis system for an orthopaedic hip implant and method of use is disclosed. The prosthesis system includes a femoral stem component and a plurality of collar components configured to be selectively coupled to the stem component in a fixed position adjacent to a neck of the stem component. Each of the collar components includes a base and is configured to secure an assembled femoral prosthesis to a patient's surgically prepared femur to provide stability for the assembled femoral prosthesis.

1 . A method for performing a hip arthroplasty, the method comprising:
 resecting a proximal end of a patient's femur to form a planar proximal surface,   selecting a femoral stem component having a neck, an elongated body extending distally from the neck, and a trunnion configured to receive a femoral head component extending medially and proximally from the neck,   inserting a broach through the planar proximal surface to define a passageway sized to receive the selected femoral stem component,   selecting a collar component from a plurality of collar components, each collar component including an inferior surface configured to engage the planar proximal surface of the patient's femur,   securing the selected collar component to the femoral stem component such that the inferior surface of the collar component extends transverse to a longitudinal axis of the trunnion of the femoral stem component, and   implanting the femoral stem component in the patient's femur such that the inferior surface of the selected collar component engages with the planar proximal surface of the patient's femur.   
     
     
         2 . The method of  claim 1 , wherein:
 selecting the collar component further includes selecting a first collar component from the plurality of collar components, the first collar component including a base having the inferior surface configured to contact a surgically prepared proximal surface of the patient's femur, the base comprising (i) a platform and (ii) a pair of arms extending away from a lateral end of the platform, the pair of arms cooperating to form a slot having an opening defined at a lateral end of the base, the slot being sized to receive the stem component, and   securing the selected collar component to the femoral stem component further includes advancing the first collar component along a groove axis defined by a groove formed in the stem component, the groove axis extending transverse to the longitudinal axis defined by the trunnion.   
     
     
         3 . The method of  claim 2 , wherein advancing the first collar component further comprises advancing the first collar component along the groove axis until the inner surface of the first collar component engages with the groove surface of the stem component. 
     
     
         4 . The method of  claim 1 , wherein selecting the collar component further includes selecting a second collar component from the plurality of collar components, the second collar component including (i) a base having the inferior surface configured to contact a surgically prepared proximal surface of the patient's femur and defining a slot sized to receive the stem component and (ii) a flange extending away from a lateral end of the base, the flange being configured to secure the second collar component in a fixed position relative to a trochanter of the patient. 
     
     
         5 . The method of  claim 4 , wherein securing the selected collar component to the femoral stem component further comprises:
 inserting a distal tip of the stem component into the slot of the second collar component,   advancing the second collar component proximally along a body axis defined in the stem component, and   engaging a groove surface that defines a groove formed in the stem component with the inner surface of the second collar component.   
     
     
         6 . The method of  claim 4 , further comprising:
 securing a trochanteric reattachment device to the patient's trochanter, the trochanteric reattachment device including a body and a plurality of cables,   threading the plurality of cables through a plurality of passageways extending through the flange of the second collar component, and   securing the threaded cables to the body of the trochanteric reattachment device.   
     
     
         7 . The method of  claim 4 , wherein the base includes a superior surface extending between a medial end of the base and the lateral end of the base and an inner wall extending between a first opening formed in the superior surface and a second opening formed in the inferior surface to define the slot sized to receive the stem component, and
 wherein the flange includes a medial surface that abuts and extends away from the superior surface of the base and cooperates with the base to define a non-orthogonal angle relative to the superior surface of the base.