USRE39301E1 - Method for resecting the knee using a resection guide and provisional prosthetic component - Google Patents
Method for resecting the knee using a resection guide and provisional prosthetic component Download PDFInfo
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- USRE39301E1 USRE39301E1 US08/698,781 US69878196A USRE39301E US RE39301 E1 USRE39301 E1 US RE39301E1 US 69878196 A US69878196 A US 69878196A US RE39301 E USRE39301 E US RE39301E
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- knee
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/46—Special tools or methods for implanting or extracting artificial joints, accessories, bone grafts or substitutes, or particular adaptations therefor
- A61F2/4684—Trial or dummy prostheses
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/14—Surgical saws ; Accessories therefor
- A61B17/15—Guides therefor
- A61B17/154—Guides therefor for preparing bone for knee prosthesis
- A61B17/155—Cutting femur
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/38—Joints for elbows or knees
- A61F2/3859—Femoral components
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30329—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
- A61F2002/30405—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements made by screwing complementary threads machined on the parts themselves
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30316—The prosthesis having different structural features at different locations within the same prosthesis; Connections between prosthetic parts; Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30535—Special structural features of bone or joint prostheses not otherwise provided for
- A61F2002/30594—Special structural features of bone or joint prostheses not otherwise provided for slotted, e.g. radial or meridian slot ending in a polar aperture, non-polar slots, horizontal or arcuate slots
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2002/30001—Additional features of subject-matter classified in A61F2/28, A61F2/30 and subgroups thereof
- A61F2002/30667—Features concerning an interaction with the environment or a particular use of the prosthesis
- A61F2002/30672—Features concerning an interaction with the environment or a particular use of the prosthesis temporary
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30721—Accessories
- A61F2/30734—Modular inserts, sleeves or augments, e.g. placed on proximal part of stem for fixation purposes or wedges for bridging a bone defect
- A61F2002/30736—Augments or augmentation pieces, e.g. wedges or blocks for bridging a bone defect
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2/00—Filters implantable into blood vessels; Prostheses, i.e. artificial substitutes or replacements for parts of the body; Appliances for connecting them with the body; Devices providing patency to, or preventing collapsing of, tubular structures of the body, e.g. stents
- A61F2/02—Prostheses implantable into the body
- A61F2/30—Joints
- A61F2/30767—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth
- A61F2/30771—Special external or bone-contacting surface, e.g. coating for improving bone ingrowth applied in original prostheses, e.g. holes or grooves
- A61F2002/30795—Blind bores, e.g. of circular cross-section
- A61F2002/30797—Blind bores, e.g. of circular cross-section internally-threaded
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
- A61F2220/00—Fixations or connections for prostheses classified in groups A61F2/00 - A61F2/26 or A61F2/82 or A61F9/00 or A61F11/00 or subgroups thereof
- A61F2220/0025—Connections or couplings between prosthetic parts, e.g. between modular parts; Connecting elements
Definitions
- the present invention relates to a method and apparatus for a knee joint prosthes is and surgical procedure. More particularly concerning the proper fitting of the femoral component of a total knee revision prosthesis, the procedure for performing revision surgery and apparatus used therein.
- the present invention relates to a provisional knee prosthesis and resection guide component together with a surgical procedure designed for use as a system in revision surgery of previously performed knee arthroplasties. It may also find utility in an initial knee replacement procedure.
- Revision surgery is performed to correct failures of previously implanted knee prostheses. These failures occur for a number of reasons including malposition, loosening of the prosthesis, infection or dislocation. Such categories are not necessarily mutually exclusive since infection may cause a loosening of the prosthesis which, in turn, might cause dislocation.
- the apparatus and method of this invention are intended to be used in conjunction with the revision prosthesis system of applicant's co-pending application which is based around a constant geometry of the anterior flange, the distal prosthesis and the intramedullary stem of the component and uses the intramedullary canal of the femur as a reference point. Accordingly, the present invention is similarly based around the intramedullary canal of the femur as a reference point for all of the bone cuts.
- Tibial resection for implantation of the tibial component of an initial knee prosthesis or revision is relatively straight-forward as it essentially only requires surface treatment of the proximal end of the tibia.
- cutting guides are normally positioned relative to the intramedullary canal of the tibia by attaching the guides to the intramedullary reamer or to an alignment rod placed within the reamed canal.
- Such devices are shown in U.S. Pat. Nos. 4,952,213 to Bowman, et al., and 5,002,545 to Whiteside, et al.
- intramedullary and extramedullary positionable guide means In contract, however, prior apparatus and methods for performing the comparable resection of the distal femur have included both intramedullary and extramedullary positionable guide means, often both, frequently requiring accurate adjustment for the individual circumstances.
- the intramedullary positioned guide means have been traditionally used only for the distal and posterior resection of the femur leaving the anterior cuts to be made with extramedullary positioned means.
- Such intramedullary positionable distal and posterior cut guide means are represented by U.S. Pat. Nos. 4,703,751 to Pohl and 4,935,023 to Whiteside, et al.
- the Pohl patent presents a guide means for resection of the distal surface, which guide is positionable on a jig which is removably connected to an intramedullary rod.
- the jig allows the cutting guide to be angularly pivoted relative to the center line of the femur.
- Whiteside, et al. present a shaping guide also removably attachable to an intramedullary rod and having an adjustable positioning means together with guides for the shaping of only one condyle in preparation for the implantation of a unicondylar prosthesis.
- anterior surface resection guides to be positionable relative to an intramedullary rod
- U.S. Pat. No. 4,474,177 to Whiteside presents an apparatus for shaping the distal femoral surface wherein a plurality of shaping instruments or guides are selectively positionable on an intramedullary rod for use in guiding a saw blade during the procedure.
- U.S. Pat. No. 4,474,177 to Whiteside presents an apparatus for shaping the distal femoral surface wherein a plurality of shaping instruments or guides are selectively positionable on an intramedullary rod for use in guiding a saw blade during the procedure.
- what the prior art lacks is an apparatus and method whereby all cuts can be made from the common reference point of the intramedullary canal of the femur and whereby the positioning and size of a femoral component may be checked relative to the soft tissues and the track of the patella prior to making the final resection of the anterior surfaces.
- the cuts are made first then the guides are removed before any test fittings can be conducted. If the cuts are made in the wrong place or to the wrong degree, then the surfaces must be modified by further resection, bone grafts or bone cement to get a proper fit of the implant.
- the present invention provides a provisional component which allows the selected size of a prospective implant to be test fit with respect to the distal and posterior resections of the femur and the soft tissues of the knee joint before making the final resection of the anterior surface of the femur. It also provides a guide means as an integral part of the provisional component for making those final cuts to the anterior surface. Furthermore, it provides a means whereby the relative spacing of the extension and flexion gaps in the knee joint may be tested using the provisional component with prospective augments or trial pieces, when necessary, in place following which the provisional component itself serves as the guide for making the final surface cuts thus ensuring that the resected femur and ultimate permanent prosthesis will result in a properly balanced knee.
- the augments which are modular and therefore independently changeable, allow adjustment of the anterior/posterior box size as well as the distal positioning of the provisional component. Such distal positioning is crucial for obtaining correct soft tissue balance in the knee during trial reduction before final anterior resection and implantation of the permanent prosthesis.
- Modular augments and pretesting of the knee with the provisional component of the present invention also enable the surgeon to ensure a close contact fit of the prosthesis with the resected bone surface whereby a greater degree of adhesion may be obtained through bone ingrowth or less bone cement need be used.
- the provisional component is constructed to emulate the permanent implant while being temporarily placed in the joint space.
- a permanent implant system is described by my copending application Ser. No. 07/862,954 filed Apr. 3, 1992. It includes the anterior and posterior condylar flanges as well as the intermediate distal portion of the joint surface.
- An intramedullary stem is provided or, alternatively, the provisional may be adapted for attachment to an intramedullary rod or reamer placed in the femoral intramedullary canal. Provision is also made for the provisional component to temporarily accept distal and posterior augments for proper spacing so that the final anterior surface cuts will be accurately made.
- the provisional component includes bone saw guides positioned through the body of the component relative to the anterior flange for the correct location and angular position of the chamfer and anterior surface cuts necessary to fit a final permanent implant.
- FIG. 1 is an oblique view of a standard femoral component of a knee revision prosthesis.
- FIG. 2 is a view of a knee joint in full extension.
- FIG. 3 is a view of a knee joint in full flexion.
- FIG. 4 is an oblique view of the femoral component provisional and resection guide apparatus of the present invention.
- FIG. 5 is a composite view of the femoral component provisional and resection guide apparatus of the present invention illustrating its component parts.
- FIG. 6 is a cross section of a partially prepared femur illustrating the femoral component provisional and resection guide in place prior to making anterior flange and chamfer cuts on the femur.
- FIG. 7 is a posterior elevation view of the femoral component provisional and resection guide apparatus of FIG. 4 .
- the femoral component revision prosthesis of FIG. 1 is similar to that employed in most knee prosthetics in that it comprises an anterior flange 1 , a pair of posterior condylar flanges 2 and 3 , a distal femur contacting surface 4 , an intramedullary locating and anchor shaft 5 and a distal joint surface 6 corresponding to the natural distal femoral surface of the human knee with condylar surfaces 7 and 8 for cooperation with the corresponding end of a tibia and means for patellar tracking along the arc of the joint surface of the anterior flange 1 and between the distal condylar surfaces 7 and 8 .
- Femoral component prostheses of this general type have been used for some time in knee reconstruction and have been made available in a range of sizes to accommodate patients having different skeletal and joint sizes. Such components have required that the distal end of the femur be resected to the specific size of the individual component, necessitating careful shaving of the bone by the surgeon and multiple fittings of the prosthesis before the procedure is finished. Alternatively, a wide array of augments attachable to the distal femur contacting surface 4 of the component have been necessary to ensure a proper fit of the correct size component to a patient's femur.
- a patient having an anatomical knee size of six may, following resection of the femur, have a distal femoral surface corresponding to that for a size four and a half knee.
- the implanted component be a size six.
- adapting a larger size implant to a smaller size bone has presented difficulties which, to date, have been solved by the use of custom made implants or multiple augments.
- Prior devices and methods have required measuring the size of the bone and then cutting it to fit one specific size of prosthesis. This allows a good fit to be obtained between the prosthesis and the bone but may not provide a good fit with the soft tissues and the patella.
- the flexion space of the knee ie., that space between the posterior edge of the prepared distal femur and the prepared proximal tibia when the knee is fully bent as shown by space B in FIG. 3
- the extension space ie., that space between the distal femur and proximal tibia when the knee is fully extended, as shown by space A in FIG. 2 .
- the tension between the distal femur and the proximal tibia should be the same whether the knee is in flexion or extension.
- the present apparatus and method allow testing of the knee action with the provisional component, which corresponds to the permanent implant, in order to ensure that the flexion and extension gaps are even for proper working of the knee before final resection cuts are made to the anterior surface of the femur and to ensure a close contact fit with the resected bone surface.
- the femoral components of applicant's copending application and the method and apparatus of this invention are based around the intramedullary canal as a constant point of reference as well as a constant geometry of the components in a set with regard to the relationship between the intramedullary stem and the anterior flange of the components. This makes adjustment and placement of femoral components during surgery easier since it eliminates at least one variable from the procedure. Since the relationship between the intramedullary stem and the anterior flange is constant, the anterior resection cuts must be properly placed relative to the intramedullary canal as well as relative to the posterior and distal cuts in order to obtain a properly workable knee joint. The apparatus and method of this invention provide the means whereby this is achieved.
- FIGS. 2 and 3 illustrate the relationships of femoral 9 and tibial 10 components in a knee joint at full extension and full flexion respectively.
- the extension gap A and the flexion gap B should be equal for a properly functioning and stable knee.
- This relationship between the femur 11 and tibia 12 is important to get the knee implant components to interface properly with the soft tissues of the joint and to achieve a proper soft tissue balance within the knee.
- the size of the femoral revision component usually increases relative to the centerline through the fixation stem 5 with the posterior portion 6 being increased to tighten the flexion space B. However, this often affects the other relationships within the knee and upsets the soft tissue balance.
- the distal and posterior adjustments are made with the addition of augments between the femoral component 9 and the respective cuts made to the femur 11 .
- the provisional component of FIG. 4 provides a means whereby the knee joint may be tested for proper fit and function prior to resection of the anterior femur and whereby that resection may be accomplished while the provisional component is in place, thereby ensuring that the anterior cuts are made in the correct place relative to all other aspects of the joint replacement components.
- FIGS. 4 and 7 illustrate the combination femoral provisional component and anterior resection guide 20 of the invention which comprises a femoral component similar to that shown in FIG. 1 .
- the provisional 20 comprises an anterior flange 21 , posterior condylar flanges 22 and 23 , a distal femur contacting surface 24 and a distal joint surface 26 which corresponds to the natural distal femoral surface of the human knee with condylar surfaces 27 and 28 .
- chamfer 29 Between the distal femur contacting surface 24 and the inner surface 21 a of anterior flange 21 is chamfer 29 which will correspond to a chamfer cut made to the distal femur during resection procedures to be described later.
- Any suitable means for connection of the intramedullary location means may be used such as threads, 25 a as shown, press fit, detents, or the like.
- the provisional component of this invention as well as the revision prosthesis of applicant's co-pending application, have a constant relationship between the center line of the stem, or stem fixation point, and the anterior cornea of the femur for all sizes of the component. This relationship provides a constant angle between the stem and the cortex, represented by the inner surface of the anterior flange, as well as a fixed distance therebetween which is the same regardless of the anatomical sizes of the provisional components to be available in a system.
- the joint surface 26 is continuous and extends around the outer periphery of the component 20 to include the outer surface 21 b of the anterior flange 21 as well as the outer surfaces of the posterior condylar flanges 22 and 23 and the distal femoral joint portion.
- the condylar surfaces 27 and 28 continue around the periphery of the component as part of the joint surface 26 thereby providing distal, medial and lateral condylar surfaces between which will be located a track area or groove 26 a for travel of the patella as the knee joint flexes. Such travel is shown in FIGS. 2 and 3 by the relative positions of the patella 9 a.
- This structure of the provisional component enables it to be placed in the joint space following resection of the distal and posterior femur.
- the resection of the posterior and distal surfaces of the medial and lateral condyles is kept to the least amount necessary.
- each condyle is preferably resected independently of the other and separate augments are selected for test fitting the provisional component and for final implantation of the a femoral implant component.
- These cuts may be standardized relative to the anatomical characteristics of an average range of knee sizes for a population or they may be made on the basis of each individual case. The function of the knee may then be checked as well as the relationship of the provisional to the soft tissues of the joint.
- the correct size provisional component and, thereby, the prosthesis will usually be determined before surgery, it may be necessary, following initial resection, to upsize to the next larger component in order to tighten the flexion and extension gaps.
- the present invention facilitates this process by permitting the sizes to be tested before the final prosthesis is implanted.
- the anterior chamfer and anterior flange resection may be accomplished without removing the provisional component thereby ensuring that these cuts are made in the correct locations relative to the intramedullary canal and at the correct angles relative to the intramedullary stem.
- the anterior flange cut be made last, after the posterior and distal cuts and after correct working of the joint and soft tissue balance has been established. Because the system of revision for which the provisional component of this invention is intended uses the intramedullary canal of the femur as a reference point, the angle established between a reamer or intramedullary shaft and the anterior flange of an implant is constant through all sizes of such implants. Therefore, if the anterior flange cut is made before the posterior and distal cuts and before the extension and flexion gaps are stabilized, the constant relationship will be lost once those cuts are made and stabilization of the knee and soft tissue balance will be much more difficult to achieve.
- the correct order for the procedure is to first resect the distal and posterior femoral surfaces with the cutting guides therefor positioned relative to the reamer used to prepare the intramedullary canal.
- the provisional component is inserted, using either the reamer or a separate intramedullary shaft for positioning, and the fit and balance of the knee are determined before finally making the anterior flange cuts.
- the provisional component 20 is provided with cutting guides 30 and 31 .
- These guides 30 and 31 comprise slots in the body of the provisional component 20 with guide 30 at the correct angle and location for the anterior flange resection cut while guide 31 is at the correct angle and location for the anterior chamfer resection cut.
- Each guide actually comprises two slots placed on either side of the intramedullary stem fixation point 25 and extending from the edge of the component 20 inward toward the longitudinal center line 35 of the component to a point adjacent the intramedullary stem fixation point 25 .
- the slots further extend completely through the component 20 from the joint surface 26 to the femoral contact surface 24 with the two slots of each guide 30 and 31 being necessarily located on the same relative plane through the component 20 .
- cutting guides 30 and 31 do not extend completely across component 20 from edge to edge in order to maintain the component as a complete unit. Also, the cutting is primarily conducted on the condylar surfaces of the femur which will provide a guide for any final dressing of the intervening mid surface.
- FIG. 5 illustrates the primary components of the provisional apparatus and resection guide of the present invention while FIG. 6 shows their position in relationship to the distal end of a femur.
- the entire apparatus comprises the provisional component 20 described above, an intramedullary stem 32 affixable to fixation point 25 on the provisional component 20 , and a combined distal/posterior augment 33 preferably temporarily affixable to the femoral contact surface 24 of provisional component 20 .
- augment 33 may comprise separate distal and posterior pieces to allow greater variation and accommodate wider ranges of differences between the individual condyles of the knee.
- Anterior flange resection guide 30 and anterior chamfer resection guide 31 are shown in phantom.
- anterior flange 21 The inner surface 21 a of anterior flange 21 is relieved to allow it to fit on the end of the femur 11 prior to anterior resection, as shown in FIG. 6 .
- joint surface 21 b of the anterior flange 21 when the component 20 is in place will properly correspond to the location of the same joint surface of a permanent component so that action of the joint with the provisional component 20 in place will mimic joint action following implantation of the permanent component. This relationship is important since the provisional component 20 is used to test for proper alignment of the knee joint and soft tissue balance, and to establish proper tracking of the patella 9 a.
- the position of anterior resection cutting guide 30 does not coincide with the relieved inner surface 21 a of anterior flange 21 . Rather, the position and angle of guide 30 corresponds to the requirement for the anterior femur contacting surface of the permanent component to be implanted and its relationship to the constant reference point of the intramedullary canal.
- the angle of guide 30 relative to the axis of intramedullary stem 32 will preferably correspond to that of the anterior flange and intramedullary stem of the femoral components of applicant's copending application.
- Augments 33 provide buildup for the resected areas of the distal and posterior condyles of the femur 11 in order to maintain the correct anatomical relationships of the knee joint between the joint surface 26 of the provisional component 20 and the corresponding surface of a tibial component 10 .
- the size of the augments 33 is based on the resection cuts made to the femur for the particular size of permanent component to be used. Where such cuts are standardized, there will be an equally standardized set of augments. Alternatively, where the cuts are made on a case by case basis, a wider variety of augment sizes will be available.
- the augments 33 may be provided with the provisional component 20 or they may be those provided with the permanent component in which case they will be temporarily attachable to the provisional component so that they may be removed and permanently mounted on the permanent component prior to its implantation.
- the one piece augments 33 have a substantial L-shape corresponding to the interior shape of the provisional component 20 at the distal/posterior portion.
- the augments 33 comprise a distal portion 33 a and a posterior portion 33 b.
- the augments may be provided as separate distal and posterior portions corresponding to portions 33 a and 33 b. Due to the nature of the resection of the distal femur and the fact that the extension and flexion gaps, A and B in FIGS.
- the distal and posterior portions of the augments are usually of different thicknesses. These thicknesses are determined by the resection cuts made to the distal femur relative to the size of the femoral component to be implanted.
- the provisional component of this invention allows the selection of augments 33 to be tested for accuracy in establishing the extension and flexion gaps.
- the provisional component and the temporary placement of the augments therewith permits the establishment of the proper position of the patella 9 a relative to the joint line. As shown in FIG. 2 , the joint line 34 passes through the joint at a point tangential to the femoral component 9 and the tibial component 10 .
- the position of the patella 9 a relative to this line is given as C and will depend on the particular anatomical size of a knee. This position is variable by changing the augment 33 to one having a different distal thickness 33 a thus altering both the extension gap A and the patella position C. Similarly, changing the augment 33 to one having a different posterior thickness 33 b will alter the flexion gap B. In instances where it becomes necessary to upsize to the next size provisional component and prosthesis, appropriately sized augments will be employed to ensure that the flexion and extension gaps are properly established for even tension across the knee. In this manner an accurate relationship of the provisional component 20 to the hard and soft tissues of the knee joint may be established before the final resection of the anterior femur is performed. In addition the necessary augments 33 to be used with a permanent implant component are selected and can then be attached to the permanent implant component.
- the proximal tibia is prepared by incrementally reaming the tibial intramedullary canal out to cortical bone, leaving the reamer in place as a point of reference for a tibial cutter, resecting the proximal tibia and applying provisional components for the tibial portion of the knee joint.
- the distal femur is prepared using the above described apparatus.
- the femur may be prepared first followed by the preparation of the tibia.
- the femoral intramedullary canal is first reamed incrementally to cortical bone.
- the canal is the constant reference point for the resection of the distal femur.
- the reamer may be left in place or a provisional stem or similar intramedullary rod may be inserted on which distal and posterior cutters are mounted for resection of the distal and posterior surfaces of the femur. These cuts will be made based on the condition of the bone and on the permanent prosthesis to be implanted but will preferably be made according to a standard established by the prosthesis system being used.
- the individual condyles of the posterior and distal surfaces may be resected to different levels and brought up to the same level by the use of augments.
- the femoral provisional component is put in place to test the positions of the selected prosthesis and the tissues of the knee joint. If the provisional stem was used as the support for the posterior and distal cutters then the provisional component may be substituted for those cutters otherwise it is preferable that the cutter support be removed from the intramedullary canal, the provisional stem attached to the provisional component and that assembly put in place. Augments may be attached as needed to establish the correct joint characteristics or a different size provisional component may be tried. Since all sizes of provisionals have the same stem/anterior flange distance and the same stem/anterior cortex angle, those characteristics and the resulting position of the anterior flange cuts will be the same regardless of the size provisional used. Once all such characteristics have been established, the provisional component and its included anterior resection guides are used for the final anterior chamfer and anterior flange cuts following which the provisional component, stem and augments are removed and the permanent implant component inserted.
Abstract
Description
Claims (18)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US08/698,781 USRE39301E1 (en) | 1992-04-03 | 1996-08-16 | Method for resecting the knee using a resection guide and provisional prosthetic component |
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US07/862,953 US5258032A (en) | 1992-04-03 | 1992-04-03 | Knee prosthesis provisional apparatus and resection guide and method of use in knee replacement surgery |
US08/021,039 US5458645A (en) | 1992-04-03 | 1993-02-23 | Method for resecting the knee using a resection guide and provisional prosthetic component |
US08/698,781 USRE39301E1 (en) | 1992-04-03 | 1996-08-16 | Method for resecting the knee using a resection guide and provisional prosthetic component |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US08/021,039 Reissue US5458645A (en) | 1992-04-03 | 1993-02-23 | Method for resecting the knee using a resection guide and provisional prosthetic component |
Publications (1)
Publication Number | Publication Date |
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USRE39301E1 true USRE39301E1 (en) | 2006-09-19 |
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Family Applications (3)
Application Number | Title | Priority Date | Filing Date |
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US07/862,953 Expired - Lifetime US5258032A (en) | 1992-04-03 | 1992-04-03 | Knee prosthesis provisional apparatus and resection guide and method of use in knee replacement surgery |
US08/021,039 Ceased US5458645A (en) | 1992-04-03 | 1993-02-23 | Method for resecting the knee using a resection guide and provisional prosthetic component |
US08/698,781 Expired - Lifetime USRE39301E1 (en) | 1992-04-03 | 1996-08-16 | Method for resecting the knee using a resection guide and provisional prosthetic component |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US07/862,953 Expired - Lifetime US5258032A (en) | 1992-04-03 | 1992-04-03 | Knee prosthesis provisional apparatus and resection guide and method of use in knee replacement surgery |
US08/021,039 Ceased US5458645A (en) | 1992-04-03 | 1993-02-23 | Method for resecting the knee using a resection guide and provisional prosthetic component |
Country Status (2)
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US (3) | US5258032A (en) |
CA (1) | CA2090189C (en) |
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Also Published As
Publication number | Publication date |
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CA2090189C (en) | 2004-01-06 |
US5258032A (en) | 1993-11-02 |
CA2090189A1 (en) | 1993-10-04 |
US5458645A (en) | 1995-10-17 |
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