This application claims priority under 35 U.S.C. § 121 to U.S. patent application Ser. No. 15/471,110, now U.S. Pat. No. 10,307,198, which was filed on Mar. 28, 2017 which in turn claims priority under 35 U.S.C. § 121 to U.S. patent application Ser. No. 13/837,465, now U.S. Pat. No. 9,603,649, which was filed on Mar. 15, 2013; both of which are expressly incorporated herein by reference.

CROSS-REFERENCE

Cross reference is made to U.S. patent application Ser. No. 13/837,778, now U.S. Pat. No. 9,138,321, entitled “PROSTHETIC COMPONENTS AND METHODS FOR JOINT LINE ACCESS”; and U.S. patent application Ser. No. 13/837,585, now U.S. Pat. No. 9,101,479, entitled “PROSTHETIC COMPONENTS WITH SECONDARY RETENTION”, each of which is assigned to the same assignee as the present application and is hereby incorporated by reference.

TECHNICAL FIELD

The present disclosure relates generally to an implantable orthopaedic prosthesis, and more particularly to an implantable knee prosthesis.

BACKGROUND

During the lifetime of a patient, it may be necessary to perform a joint replacement procedure on the patient as a result of, for example, disease or trauma. The joint replacement procedure may involve the use of a prosthesis which is implanted into one or more of the patient's bones. In the case of a knee replacement procedure, a tibial tray is implanted into the patient's tibia. A bearing is secured to the tibial tray. The condyle surfaces of a replacement femoral component bear against the tibial bearing.

Such a knee prosthesis may also include a number of elongated intramedullary stem components and optional prosthetic components (e.g., sleeves and/or adaptors) which are implanted in the patient's tibia and/or femur. To secure a stem component and/or other components to the patient's tibia and/or femur, the intramedullary canal of the patient's tibia and/or femur is first surgically prepared (e.g., reamed) such that the stem component and/or other components may be subsequently implanted therein. In some designs, the stem component is implanted in the patient's bone by use of cementless fixation. One type of such a design is known as a ‘press fit’ stem component.

Various orthopaedic surgical instruments are used throughout such an orthopaedic procedure. For example, bone saws and/or reamers may be use to surgically prepare a bone surface to accept an orthopaedic implant. Additionally, depending on the particularly implant, a variety of orthopaedic surgical instruments may be used to assembly, disassembly, and/or install the orthopaedic implant into the prepared bone.

SUMMARY

According to one aspect of the disclosure, an orthopaedic surgical instrument is disclosed. The orthopaedic surgical instrument includes a main component, a rod component, and a spindle component. The spindle component includes a housing and an elongated body extending from the housing. The housing and the elongated body define a longitudinal axis and a passageway is defined in the elongated body along the longitudinal axis. The rod component includes a head configured to be received in the housing of the main component and an elongated shaft extending from the head. The elongated shaft is configured to pass through the elongated body of the main component and has a length greater than a length of the elongated body of the main component. The spindle component includes a threaded body configured to thread into the housing to move the rod component along the longitudinal axis.

In some embodiments, the rod component may be selected from a plurality of rod components with each rod component of the plurality of rod components having an elongated shaft with a different length. An end of the elongated body of the main component opposite the housing may have a threaded outer surface. Additionally, the head of the rod component may have a diameter greater than a diameter of the passageway of the elongated body of the main component.

In some embodiments, the spindle component may include an aperture defined at an end of the threaded body, the aperture may be sized to fit the head of the rod component. Further, the diameter of the aperture may be less than a diameter of the spindle component. The spindle component may include a handle body opposite the threaded body configured to receive a handle component for threading the spindle component. An outer surface of the housing of the main component may be shaped to match a connection surface of a wrench component. Additionally, the outer surface may be shaped to match a connection surface of a hex wrench.

According to another aspect, a method for disassembling a femoral component assembly is disclosed. The method includes securing an end of a main component to a femoral component, advancing a rod in a first direction through the main component and into contact with a stem component secured to the femoral component and positioned in a bone of a patient, threading a spindle component into the main component to apply a force in the first direction to the rod, and continuing to thread the spindle component into the main component to increase the force applied in the first direction to disengage the femoral component from the stem component.

In some embodiments, the method may include removing a fastener securing the femoral component to the stem component from the femoral component assembly. Additionally, the method may include engaging a fastener with a driver positioned along a joint line, unthreading the fastener from the stem component using the driver, and removing the fastener from the femoral component assembly.

In some embodiments, the method may include removing a retention device from a threaded passageway of the stem post of the femoral component, such that the retention device is configured to prevent an end of the fastener from reentering the threaded passageway after being secured to the stem component. Removing the retention device may include driving a removal screw into the retention device. Additionally, the end of the main component to the femoral component may include threading an elongated body of the main component into a threaded passageway defined in the femoral component. Further, continuing to thread the spindle component may include continuing to thread the spindle component into the main component to increase the force applied in the first direction to move the femoral component in a second direction opposite the first direction.

According to another aspect, a method for disassembling an orthopaedic prosthesis assembly is disclosed. The method may include securing an end of a first surgical instrument to a first prosthetic component, advancing a rod in a first direction through the first prosthetic component and into contact with a second prosthetic component secured to the first prosthetic component, threading a second surgical instrument into the first surgical instrument to apply a force in the first direction to the rod, and continuing to thread the second surgical instrument into the first surgical instrument to increase the force applied in the first direction to the rod to disengage the first prosthetic component from the second prosthetic component.

In some embodiments, the method may include removing a fastener securing the first prosthetic component to the second prosthetic component and removing a retention device from a threaded passageway of the first prosthetic component, the retention device configured to prevent an end of the fastener from reentering the threaded passageway after being secured to the second prosthetic component. Further, securing the end of the first surgical instrument to the first prosthetic component may include threading an elongated body of the first surgical instrument into a threaded passageway defined in the first prosthetic component. Additionally, continuing to thread the second surgical instrument may include continuing to thread the second surgical instrument into the first surgical instrument to increase the force applied in the first direction to move the first prosthetic component in a second direction opposite the first direction.

According to another aspect of the disclosure, an implantable orthopaedic knee prosthesis assembly is disclosed. The implantable orthopaedic knee prosthesis assembly includes a femoral component configured to be implanted into a distal end of a femur of a patient, a stem component including a tapered post configured to be received in the tapered bore of the femoral component, a fastener, and a retention device. The femoral component includes a bearing surface having a medial condyle surface and a lateral condyle surface, a backside surface opposite the bearing surface, and a stem post extending superiorly away from the backside surface along an axis. The stem post has a proximal tapered bore, a distal passageway, and a threaded passageway connecting the proximal tapered bore and the distal passageway. The tapered post includes a bore formed therein extending proximally along the axis and a threaded aperture defined at a proximal end of the bore. The fastener includes a head configured to be received in the distal passageway and an elongated shaft having a proximal end configured to be positioned in the threaded aperture. Additionally, the retention device is configured to be received in the threaded passageway to prevent the proximal end of the fastener from entering the threaded passageway. Further, the head of the fastener has a diameter larger than a diameter of the threaded passageway and the elongated shaft has a diameter less than the diameter of the threaded passageway.

In some embodiments, the stem component may include an elongated body extending from the tapered post along the axis. The proximal end of the elongated shaft of the fastener may include a threaded portion to be threaded into the threaded aperture of the stem component. Additionally, a distance the fastener is configured to move with the retention device received in the threaded passageway may be a function of a length of the threaded portion. Further, the retention device may be composed of polymeric material.

According to another aspect, an orthopaedic prosthesis assembly includes a first prosthetic component, a second prosthetic component, a fastener, and a retention device. The first prosthetic component is configured to be implanted into a bone of a patient and includes a surface configured to contact the bone and a stem post extending away from the surface along an axis. The stem post has a tapered bore, a first passageway, and a threaded second passageway connecting the tapered bore and the first passageway. The second prosthetic component includes a tapered post received in the tapered bore of the first prosthetic component. Further, the tapered post has a bore formed therein extending along the axis and a threaded aperture defined at an end of the bore. The fastener includes a head received in the first passageway and an elongated body extending through the threaded second passageway along the axis and having an end positioned in the threaded aperture. Additionally, the retention device is received in the stem post to prevent the end of the fastener from entering the first passageway.

In some embodiments, the first prosthetic component may be a femoral component. In another embodiment, the first prosthetic component may be a tibial tray. The second prosthetic component may a stem component. Additionally, the head of the fastener may have a diameter greater than a diameter of the threaded second passageway and the elongated body of the fastener may have a diameter less than the diameter of the threaded second passageway. The end of the elongated body of the fastener may be threaded into the threaded aperture of the second prosthetic component.

In some embodiment, the elongated body of the fastener may be configured to pass through the retention device, and the retention device may be received in the threaded second passageway of the first prosthetic component. The retention device may be received in the first passageway. Additionally, the retention device may include polymeric material. Further, the retention device may include high molecular weight polyethylene.

According to another aspect, a method for assembling an implantable orthopaedic knee prosthesis assembly includes inserting a post of a stem component into a bore defined in a femoral component to secure the stem component to the femoral component, advancing an end of a fastener through a threaded passageway defined in the femoral component and into the post of the stem component, threading the end of the fastener into a threaded aperture defined in the stem component, and engaging a retention device with the femoral component to prevent the end of the fastener from reentering the threaded passageway after advancing the end of the fastener through the threaded passageway and into the post of the stem component.

In some embodiments, inserting the post of the stem component into the bore may include inserting a tapered post of a stem component into a tapered bore defined in a femoral component to secure to the stem component to the femoral component. Additionally, the method may include inserting the assembled implantable orthopaedic knee prosthesis assembly into a prepared bone of a patient.

In some embodiments, engaging the retention device with the femoral component may include engaging a retention device with the threaded passageway of the femoral component to prevent the end of the fastener from reentering the threaded passageway after advancing the end of the fastener through the threaded passageway and into the post of the stem component. Additionally, engaging the retention device with the femoral component may include inserting a retention device into a passageway of the femoral component distal to the threaded passageway to prevent the end of the fastener from reentering the threaded passageway after advancing the end of the fastener through the threaded passageway and into the post of the stem component.

According to another aspect of this disclosure, a method for joint line assembly of an orthopaedic prosthesis assembly includes inserting a tapered post of a first prosthetic component into a tapered bore of a second prosthetic component along a longitudinal axis to secure the first prosthetic component to the second prosthetic component, advancing along the longitudinal axis a shaft of a fastener through a threaded passageway defined in the second prosthetic component and into the first prosthetic component such that the threaded passageway has a greater diameter than a diameter of the shaft, and threading an end of the shaft into a threaded aperture defined in the first prosthetic component.

In some embodiments, the first prosthetic component may be a stem component and the second prosthetic component may be a femoral component that may include a bearing surface having a medial condyle surface and a lateral condyle surface, a backside surface opposite the bearing surface, and a stem post extending superiorly away from the backside surface, the tapered bore being defined in the stem post. The second prosthetic component may be a femoral sleeve component including a plurality of step surfaces and the first prosthetic component may be a stem component including an elongated body extending from the tapered post.

In some embodiments, the method may include inserting a tapered stem post of a femoral component into a second tapered bore of the second prosthetic component to secure the femoral component to the second prosthetic component. The femoral component may include a bearing surface having a medial condyle surface and a lateral condyle surface, a backside surface opposite the bearing surface, and the tapered stem post extending superiorly away from the backside surface, and the first second prosthetic component may be a femoral sleeve component including a plurality of step surfaces and the first prosthetic component may be a stem component including an elongated body extending from the tapered post.

In some embodiments, the first prosthetic component may be a stem component including an elongated body extending from the tapered post and the second prosthetic component may be a tibial tray including a bearing surface configured to contact a bearing a backside surface opposite the bearing surface, and a stem post extending inferiorly away from the backside surface such that the tapered bore is defined in the stem post. Inserting the tapered post of the first prosthetic component into the tapered bore of the second prosthetic component may include securing the first prosthetic component to the second prosthetic component by a taper fit. Additionally, the first prosthetic component may be secured to the second prosthetic component by only the taper fit and the fastener. Further, the method may include advancing a retention device through the second prosthetic component along the longitudinal axis to engage the threaded passageway defined in the second prosthetic component.

According to another aspect, a method for joint line assembly of an orthopaedic prosthesis assembly may include inserting a tapered post of a stem component into a first tapered bore of a femoral sleeve component along a longitudinal axis to secure the stem component to the femoral sleeve component such that the first tapered bore is located at a first end of the femoral sleeve component, advancing along the longitudinal axis a shaft of a fastener through a threaded passageway defined in the femoral sleeve component and into the stem component such that the shaft has a first diameter and the threaded passageway has a second diameter greater than the first diameter, threading the end of the fastener into a threaded aperture defined in the stem component, and inserting a tapered stem post of a femoral component into a second tapered bore of the femoral sleeve component along the longitudinal axis to secure the femoral component to the femoral sleeve component such that the second tapered bore is located at a second end of the femoral sleeve component opposite the first end along the longitudinal axis.

In some embodiments, the stem component and the femoral sleeve component may be secured by only a taper fit between the stem component and the femoral component and the fastener. Additionally, the method may include inserting the stem component into a femur of a patient. Advancing the shaft of a fastener may include advancing a head of the fastener through a distal passageway defined in the femoral sleeve component distal to the threaded passageway, the head having a third diameter greater than the second diameter.

In some embodiment, advancing the end of the fastener through the threaded passageway may include advancing the end of the fastener through the threaded passageway defined in the femoral sleeve component prior to inserting the tapered stem post of the femoral component into the second tapered bore of the femoral sleeve component. The method may include advancing a retention device through the femoral sleeve component along the longitudinal axis to engage the threaded passageway defined in the femoral sleeve component.

According to another aspect of this disclosure, an orthopaedic prosthesis assembly is disclosed. The orthopaedic prosthesis assembly includes a first prosthetic component, a second prosthetic component, and a third prosthetic component. The first prosthetic component includes an outer surface, a surface positioned opposite the outer surface that is configured to contact a bone of a patient and a stem post extending from the surface along an axis. The second prosthetic component includes a first end secured to stem post of the first prosthetic component, a second end opposite the first end, and a tapered bore defined in the second end. The third prosthetic component includes a tapered post received in the tapered bore of the second prosthetic component. Further, the tapered post has a bore formed therein extending along the axis. Additionally, a passageway is defined in the orthopaedic knee prosthesis assembly along the axis from the outer surface of the first prosthetic component to an end of the bore of the third prosthetic component. A fastener extends along the axis is secured to the second prosthetic component and the third prosthetic component.

In some embodiments, each of the first prosthetic component, the second prosthetic component, and the third prosthetic component is devoid of an opening transverse to the axis. Additionally, the second prosthetic component may be a femoral sleeve component including a plurality of step surfaces and the third prosthetic component may be a stem component including an elongated body extending from the tapered post.

In some embodiments, the first prosthetic component may be a femoral component and may include the outer surface having a medial condyle surface and a lateral condyle surface, a backside surface opposite the bearing surface, and a tapered stem post extending superiorly away from the backside surface. In another embodiment, the first prosthetic component may be a tibial tray including the outer surface, which is configured to contact a bearing a backside surface opposite outer surface, and the stem post extending inferiorly away from the backside surface. In such an embodiment, the second prosthetic component may a tibial stem adaptor including a second tapered post defined at the first end and the third prosthetic component may be a stem component having an elongated body extending from the tapered post.

