US20100185296A1 - Modular orthopaedic component case - Google Patents

Abstract

A case for modular neck components for hip implants. The case may include indicators based on independent variables associated with physical characteristics of the implant, including leg length, offset, and anteversion. During surgery, the surgeon may be confronted with a need to change a preoperatively-chosen modular neck. For example, the surgeon may desire a change in at least one of the variables, e.g., leg length, offset, and/or anteversion. The case allows the surgeon to quickly and easily select a different modular neck based on an evaluation of one of the variables without requiring reevaluation of the other variables. A method described herein may include preoperative planning in which a template including a grid coordinate system is used, which advantageously provides an intuitive system for the surgeon both preoperatively and during surgery.

Description

CROSS REFERENCE TO RELATED APPLICATIONS
• This application is a continuation of co-pending U.S. patent application Ser. No. 11/616,369, filed Dec. 27, 2006, entitled MODULAR ORTHOPAEDIC COMPONENT CASE, which is a continuation-in-part of co-pending U.S. patent application Ser. No. 11/458,257, filed Jul. 18, 2006, entitled METHOD FOR SELECTING MODULAR IMPLANT COMPONENTS, both assigned to the assignee of the present application, the disclosures of which are hereby expressly incorporated herein by reference.
BACKGROUND
• 1. Field of the Invention
• The present invention relates to modular components for prosthetic joints. More particularly, the present invention relates to a case for modular neck components for prosthetic hip joints.
• 2. Description of the Related Art
• Orthopaedic prosthetic implants are commonly used to replace some or all of a patient's hip joint in order to restore the use of the hip joint, or to increase the use of the hip joint, following deterioration due to aging or illness, or injury due to trauma. In a hip replacement, or hip arthroplasty procedure, a femoral component is used to replace a portion of the patient's femur, including the femoral neck and head. The femoral component is typically a hip stem, which includes a stem portion positioned within the prepared femoral canal of the patient's femur and secured via bone cement, or by a press-fit followed by bony ingrowth of the surrounding tissue into a porous coating of the stem portion. The hip stem also includes a neck portion adapted to receive a prosthetic femoral head. The femoral head may be received within a prosthetic acetabular component, such as an acetabular cup received within the prepared recess of the patient's acetabulum.
• Orthopaedic implants for hip replacement may include modular hip joint components. For example, the hip stem and the neck portion with femoral head are formed as separate components. Prior to an operation, a surgeon chooses a hip stem and a neck portion based on patient anatomy, body image scans, and/or other patient-specific data. However, during surgery, the surgeon may discover that a different hip stem or a different neck portion is desired to provide more optimum results. Modular hip joint components allow the surgeon to choose a different hip stem or neck portion depending on the specific application and needs of the patient and surgeon. Typically, the surgeon will only change the neck portion because the hip stem is usually implanted first, and removal of the hip stem from the femoral intramedullary canal is generally undesirable. Thus, the neck portion is usually the component that is most often changed intraoperatively. The surgeon may be provided with a number of different neck portions to accommodate various patient anatomies.
• In one known system, for example, the surgeon chooses from a plurality of options to replace an existing neck portion with an alternative neck portion to provide the best outcome for the patient. The surgeon's choices rely on the location of the center of rotation of the femoral head component of the implant. Referring toFIG. 1, an image of aproximal femur20 is shown and includesfemoral head22,greater trochanter24,lesser trochanter26,femoral neck28, and a portion offemoral shaft27.FIG. 1 illustrates aportion30 of a template used in the known system. The template may also include images of the femur, similar to those described below with reference toFIGS. 3 and 4.Portion30 of the template may be placed over the image ofproximal femur20 acquired preoperatively to plan the optimum location of the center of the femoral head of the implant.Portion30 of the template may include a plurality ofreference points32,34 arranged in a generally fan-shaped arrangement. Each reference point represents the center of rotation for the femoral head component of the implant. Typically,reference points32,34 may be based on a spherical or cylindrical coordinate system. If the surgeon desires an intra-operative change which differs from the preoperatively chosen modular neck portion, the surgeon must simultaneously evaluate at least three variables based on the center of rotation of the femoral head of the implant, and may need to consult various tables to evaluate these variables based on physical characteristics of the patient in order to choose an optimal implant.
SUMMARY
• The present disclosure provides a case for modular neck components for hip implants. The case may include indicators based on independent variables associated with physical characteristics of the implant, including leg length, offset, and anteversion. During surgery, the surgeon may be confronted with a need to change a preoperatively-chosen modular neck. For example, the surgeon may desire a change in at least one of the variables, e.g., leg length, offset, and/or anteversion. The case allows the surgeon to quickly and easily select a different modular neck based on an evaluation of one of the variables without requiring reevaluation of the other variables. A method described herein may include preoperative planning in which a template including a grid coordinate system is used, which advantageously provides an intuitive system for the surgeon both preoperatively and during surgery.
• In one form thereof, the present disclosure provides a system for facilitating implant selection, the system including a plurality of implants including at least one subset in which at least one of a first, second, and third variable associated with a respective different physical characteristic of the implants is constant and the others of the first, second, and third variables vary within each subset; and at least one case including a plurality of receptacles, each receptacle configured to receive a corresponding one of the plurality of implants, the plurality of receptacles configured to facilitate selection of one of the plurality of implants based on a change in the at least one variable.
• In another form thereof, the present disclosure provides a system for facilitating implant selection, the system including a plurality of implants including at least one subset in which at least one of a first, second, and third variable associated with a respective different physical characteristic of the implants is constant and the others of the first, second, and third variables vary within each subset; and receptacle means for receiving each of the plurality of implants and for facilitating selection of one of the plurality of implants based on a change in the at least one variable.
BRIEF DESCRIPTION OF THE DRAWINGS
• The above-mentioned and other features of the disclosure, and the manner of attaining them, will become more apparent and will be better understood by reference to the following description of embodiments of the disclosure taken in conjunction with the accompanying drawings, wherein:
• FIG. 1 is an image of a proximal femur, further showing a portion of a template of a known system overlaid on the image;
• FIG. 2 is a flow chart illustrating steps of a method according to one embodiment of the present invention;
• FIG. 3 is an image of a template according to one embodiment of the present invention;
• FIG. 4 is a perspective view of the template ofFIG. 3 overlaid over the image of a proximal femur;
• FIG. 5A is a plan view of an exemplary case of modular neck components used in the method illustrated inFIG. 2;
• FIG. 5B is a plan view of another exemplary case of modular neck components used in the method illustrated inFIG. 2;
• FIG. 5C is a plan view of yet another exemplary case of modular neck components used in the method illustrated inFIG. 2;
• FIG. 6 is an exploded view of a modular implant; and
• FIG. 7 is a plan view of an exemplary embodiment case for modular neck components.
• Corresponding reference characters indicate corresponding parts throughout the several views. The exemplifications set out herein illustrate embodiments of the disclosure and such exemplifications are not to be construed as limiting the scope of the invention in any manner.
DETAILED DESCRIPTION
• Referring toFIG. 2, a flow chart illustrating steps ofmethod100 is shown and includes several steps beginning withstep102.Step102 includes preparing a patient (not shown) for the surgical procedure, e.g., collecting information and past medical history. Instep104, the surgeon or a surgeon's assistant will acquire at least one image of the appropriate portion of the hip region of the patient, e.g., at least a portion of the femur and the hip joint. The image may be a radiographic image such as an X-ray image or fluoroscopic image, for example, or, alternatively, a computed tomography (CT) image, a magnetic resonance image (MRI), or any other suitable image. Typical images for a hip replacement procedure may be taken along two different directions. For example, anterior/posterior (A/P) and lateral pelvic images may be taken of the hip joint.
• Referring now toFIG. 3, atemplate50 is shown which may be used in conjunction with the images to preoperatively plan a surgical procedure in order to perform the joint replacement/restoration.Template50 may be constructed of a piece of transparent plastic or other suitable material which may be overlaid on the image of the hip portion of the patient.Template50 may include a plurality ofreference points51 forming a grid coordinate system, for example, a Cartesian coordinate system, including a pattern of intersecting horizontal and vertical indicators or lines that provide coordinates for locating points. Reference points51 may be formed of ink deposits on the transparent plastic, or, alternatively or in combination with the ink deposits,reference points51 may be formed as cutouts in the transparent plastic to allow the surgeon to mark directly on the acquired image where the ideal center of rotation of the femoral head of the hip implant should be located. Thegrid52 oftemplate50 may include leg length being measured along the “y-axis” and offset being measured along the “x-axis.” Alternatively, leg length may be measured along the “x-axis” and offset may be measured along the “y-axis.”Template50 may also include graphic representations of a femoral stem component of hip implant40 (FIG. 6), i.e., stem46 (FIG. 6), includingrecess48 shown in dashed lines inFIGS. 3 and 6. The representation ofstem46 may be formed of conventional ink on the transparent plastic. A plurality or system oftemplates50 may be provided corresponding to each available size or type of femoral stem component of the hip implant system.
• As shown inFIG. 3,template50 may also includereference points54 corresponding to the lateral pelvic view of the hip portion of the patient and which represent a third axial or cylindrical component corresponding to the anteversion component of the hip implant. Reference points54, which are arranged in three planes, may represent an anteverted neck, a straight neck, or a retroverted neck. The planes ofreference points54 may represent the “z-axis” ofgrid52 in the Cartesian coordinate system, or, alternatively, the third component may be represented in a cylindrical or polar coordinate system in which, when viewed from an end view of the proximal end of the femur, the planes in whichreference points54 are situated are arranged in a fan-shaped arrangement. More or less planes ofreference points54 may be included to accommodate a greater number of anteversion components, if needed.
• Instep106, the surgeon selects thetemplate50 corresponding to the femoral stem component of the hip implant to be used in the surgical procedure.Template50 may be chosen in a conventional manner such that the representation ofstem46 ontemplate50 substantially fills the intramedullary canal offemoral shaft27 of the image, such that the actual femoral stem component of the hip implant will correctly fit the intramedullary canal of the actual femur.
• Instep108 and as shown inFIG. 4, the surgeon superimposes thecorrect template50 on the acquired image. In step110,template50 may be used by the surgeon to determine the desired leg length and offset when usingportion50aoftemplate50 corresponding to the A/P pelvic view and to determine the desired anteversion and/or leg length when usingportion50boftemplate50 corresponding to the lateral pelvic view. For the purposes of this document, offset is measured along a line drawn substantially perpendicular tolongitudinal axis41 offemoral stem46. The surgeon orients the representation ofstem46 ontemplate50 to align with the intramedullary canal of the image offemoral shaft27. When the surgeon is usingportion50aoftemplate50 corresponding to the A/P pelvic view, the surgeon orientsorigin53 ofgrid52 at the location at which the surgeon desirescenter49 ofhead42 of modular neck44 (FIG. 6) to be located. This location ofcenter49 may not necessarily coincide with the original center offemoral head22 prior to surgery because the condition offemoral head22 may dictate a different center for the head of the modular implant component. For example, if the originalfemoral head22 is severely deteriorated or is badly misshapen, the surgeon may desire a different center for the head of the modular implant than the current center for the originalfemoral head22. Also, the surgeon may wish to correct some problem, e.g., laxity correction or bone alignment correction, which may cause the center for the head of the modular implant to be different than the center offemoral head22. In an exemplary procedure,origin53 coincides withcenter49, as shown inFIG. 4. The surgeon then assesses or evaluates wherecenter49 should be located ongrid52 oftemplate50. This evaluation permits the surgeon to obtain the preoperatively-planned values for the offset and the leg length for the modular neck component of the hip implant.
• Still referring to step110 andFIG. 4, when the surgeon is usingportion50boftemplate50 corresponding to the lateral pelvic view, the surgeon chooses a desired anteversion component from the planes ofreference points54. The surgeon again orients the representation ofstem46 ontemplate50 to align with the intramedullary canal of the image offemoral shaft27, in the manner described above. The surgeon may use the planes ofreference points54 to determine the desired anteversion component for the modular neck of the hip implant. In an exemplary procedure, the surgeon will determine the anteversion component first, and then determine the necessary leg length and offset values for the preoperative plan of the procedure.
• In step110, the surgeon may mark directly on the image wherecenter49 ofhead42 of modular neck44 (FIG. 6) will be located and/or what anteversion component is necessary. Instep112, the surgeon then selects amodular neck44 from system60 (FIGS. 5A-5C) corresponding to the assessed variables of leg length, offset, and anteversion in the manner described below.
• Alternatively,template50 may be a template on a computer screen in a computer assisted surgery (CAS) system. The surgeon may superimpose the computer generatedtemplate50 in the CAS system on the image of the proximal femur to determine the optimal position ofcenter49 ofhead42 of a modular neck44 (FIG. 6). In one such embodiment, advantageously, both views, i.e., A/P and lateral, may be simultaneously viewed in the CAS system andtemplate50 may be superimposed thereon to allow the surgeon to simultaneously assess all three variables, i.e., anteversion, leg length, and offset.
• During surgery and as shown instep114, a preoperatively-chosen femoral stem46 of hip implant40 (FIG. 6) is implanted into a patient's prepared intramedullary canal by a conventional surgical technique. The surgeon may then provisionally implant the preoperatively-chosen modular neck44 (FIG. 6) which has been chosen by the surgeon to provide the optimum result for the particular patient, in the manner described above. Modular neck44 (FIG. 6) may includehead42,neck portion43, and taperedportion47 shaped to mate withrecess48 infemoral stem46.Head42 may be integrally formed withneck44 orhead42 may be a modular component attached toneck portion43 ofneck44. Advantageously, the femoral stem46 (FIG. 6) of hip implant40 (FIG. 6) is equipped to accept a number of different modular neck components. Thus, the leg length, anteversion, and offset of the hip implant can be changed without requiring removal offemoral stem46.
• Instep116, the surgeon may trial the provisionally implanted modular neck44 (FIG. 6) to verify or confirm the preoperative plan and associated results. At this point, the surgeon will assess several variables, for example, leg length, offset, and anteversion, associated with the hip implant and the physical anatomy of the patient. This assessment may be completed via a conventional surgical technique, for example, moving the joint through a range of motion. The surgeon may observe that more leg length is necessary, but that the offset and anteversion are satisfactory. The present method advantageously allows the surgeon to select a new modular neck based only on the change in leg length without affecting the offset and anteversion. Similarly, the surgeon may observe that more offset is necessary, but that the leg length and anteversion are satisfactory. The present method advantageously allows the surgeon to select a new modular neck based only on the change in offset without affecting the leg length and anteversion. Because the leg length and offset changes are based on a grid coordinate system, the surgeon can easily and intuitively select a new modular neck component based on a leg length change and/or an offset change without requiring an extensive lookup table or complicated mathematical conversion calculations to ensure that no other variables are being changed undesirably.
• Similarly, the surgeon may observe that a different anteversion component is necessary, but that the leg length and offset are satisfactory. The present method advantageously allows the surgeon to select a new modular neck based only on the change in anteversion without affecting the leg length and offset. Because the anteversion component is based on a grid coordinate system, similar to leg length and offset, described above, or, alternatively, on a polar coordinate system, the surgeon can easily and intuitively select a new modular neck component based on a change in anteversion without requiring an extensive lookup table or complicated mathematical conversion calculations to ensure that no other variables are being changed undesirably.
• After the surgeon determines the desired change, the surgeon may employ system60 (FIGS. 5A-5C), described below, to choose a differentmodular neck44 to provide more optimum results.
• Referring now toFIGS. 5A-5C,system60 is arranged to include a plurality ofmodular necks44 with varying dimensions suitable for different leg length, offset, and anteversion dimensions. In one embodiment,system60 may includecontainer61 with a plurality ofcompartments63 for physically housing eachmodular neck44 insystem60, wherein eachmodular neck44 is held inrespective compartments63 and the surgeon or an assistant selects amodular neck44 from acompartment63 incontainer61. Eachneck44 may includereference identifier69. In an alternative embodiment,system60 may be a graphical representation of the plurality ofmodular necks44 arranged in an organized arrangement, e.g., a Cartesian coordinate system. In this embodiment, the surgeon may select amodular neck44 andcorresponding reference identifier69, for example, from the graphical representation, andreference identifier69 may then be used by a surgical assistant, for example, to retrieve the desiredmodular neck44 which corresponds to the surgeon's desired choice andreference identifier69 from a central location at which themodular necks44 are stored.
• A subset ofsystem60 may be provided and arranged in container orcase61. Alternatively, a plurality of subsets ofsystem60 may be provided and arranged in at least onecontainer61.System60 is arranged such that allnecks44 within a given subset of necks correspond to a particular anteversion component. Each subset may have a different anteversion component, thereby permitting a surgeon to independently assess the desired anteversion component and have an identical subset ofnecks44 for each anteversion component. For example, the anteversion component may be, for example, anteverted, straight, or retroverted. Thus, for example, referring toFIG. 5A, subset60aofnecks44 insystem60 may correspond to straight necks. Referring toFIG. 5B,subset60bofnecks44 insystem60 may correspond to anteverted necks. Similarly, referring toFIG. 5C,subset60cofnecks44 insystem60 may correspond to retroverted necks.System60 may include as many subsets ofnecks44 that correspond to the desired number of choices of the anteversion component, for example,system60 may include additional subsets corresponding to greater extremes of anteverted and retroverted necks.
• Still referring toFIGS. 5A-5C, for eachneck44 in eachsubset60a,60b,60cofsystem60,system60 includes a pair of identifying coordinates corresponding to leg length and offset. For example, the number represented by offsetcomponent62 corresponds to offset and the number represented byleg length component64 corresponds to leg length. The Cartesian coordinates represented by offsetcomponent62 andleg length component64 may be represented by the following coordinates: (±offset, ±leg length). Iforigin53 does coincide withcenter49 during the preoperative planning, then the surgeon may likely choose amodular neck44 with the following coordinates in step112: (+0, +0). Iforigin53 does not coincide withcenter49 during the preoperative planning due to, for example, a defect infemoral head22, then the surgeon may choose a modular neck with coordinates different from (+0, +0) instep112.
• Eachsubset60a,60b,60cmay include two sets of pairs of identifying coordinates corresponding to leg length and offset. Each set corresponds to either a right hip or a left hip. Advantageously, as shown inFIGS. 5A-5C, the surgeon need only rotatecontainer61 ninety degrees to switch between a system used for the left hip and the right hip. For example, as shown inFIG. 5A, the left hip pair of coordinates is identified by the letter L and the right hip pair of coordinates is identified by the letter R. Furthermore, as identified at the top ofcontainer61, the anteversion component includes a designation “right” or “left” depending on which hip thosenecks44 are to be used for. For example, if the surgeon needs a straight neck for a left hip, then the surgeon rotatescontainer61 including subset60auntil “LEFT STRAIGHT” appears at the top ofcontainer61, as shown inFIG. 5A, at which point the offset and leg length coordinates are positioned below eachrespective neck44. Alternatively, the offset and leg length coordinates may be positioned above eachrespective neck44.
• Intraoperatively, if the surgeon does not want any change in offset but needs a change in leg length, the surgeon will choose anew neck44 having the following coordinates: (preoperatively plannedoffset value, preoperatively planned leg length value±change in leg length) from a particular subset according to the chosen anteversion component. Similarly, if the surgeon does not want any change in leg length but needs a change in offset, the surgeon will choose aneck44 having the following coordinates: (preoperatively-planned offset value±change in offset, preoperatively-planned leg length value) from a particular subset according to the chosen anteversion component.
• Advantageously, arranging the plurality ofmodular necks44 in eachsubset60a,60b,60cofsystem60 in a Cartesian coordinate grid allows the surgeon to easily and intuitively intraoperatively choose amodular neck44 which corresponds to an independent change in leg length, offset, or anteversion. The surgeon may use a fluoroscopic or other image-guided system (not shown) to facilitate the assessment of the change in leg length, offset, and/or anteversion, as described above, or, alternatively, the surgeon may simply manually/visually determine the desired change in leg length, offset, and/or anteversion, and subsequently choose aneck44 from a subset ofsystem60 corresponding to the desired change.
• In one example, if the surgeon determines instep116 that more or less leg length is desired but that the offset and anteversion are satisfactory, the surgeon may select a differentmodular neck44 from a subset ofsystem60 which corresponds to the desired change. For example, if the surgeon needs no change in offset and 4 millimeters (mm) more of leg length, the surgeon chooses the neck with the following coordinates from a subset ofsystem60 corresponding to the satisfactory anteversion component: (preoperatively planned offset value, preoperatively-planned leg length value plus 4). Subsequently, thesurgeon implants neck44 into the femoral stem component of the hip implant. The surgeon may similarly choose adifferent neck44 depending on how much change in leg length was desired.
• In another example, if the surgeon determines instep116 that less leg length and more offset are desired but the anteversion is satisfactory, the surgeon may select a differentmodular neck44 from a subset ofsystem60 which corresponds to the desired change. For example, if the surgeon needs 4 mm more of offset and 4 mm less of leg length, the surgeon chooses the neck with the following coordinates from a subset ofsystem60 corresponding to the satisfactory anteversion component: (preoperatively-planned offset value plus 4, preoperatively-planned leg length value minus 4). Subsequently, thesurgeon implants neck44 into the femoral stem component of the hip implant. The surgeon may similarly choose adifferent neck44 depending on how much change in leg length and/or offset was desired.
• In yet another example, if the surgeon determines instep116 that leg length and offset are satisfactory but the anteversion needs changed, the surgeon may select a differentmodular neck44 from a subset ofsystem60 which corresponds to the desired change. For example, if the surgeon needs to change from a retroverted neck to a straight neck, the surgeon will selectneck44 from subset60aofsystem60 corresponding to a straight neck and having the desired leg length and offset.
• Instep118, thedifferent neck44 chosen by the assessment of leg length, offset, and anteversion instep116 is implanted into the stem component of the hip implant.
• Referring now toFIG. 7, another exemplary embodiment of a container ofsystem60 is shown.Container61′ is substantially similar tocontainer61, described above with reference toFIGS. 5A,5B, and5C, except as described below.Container61′ may include a plurality ofcompartments63 for physically housing eachmodular neck44 insystem60. Eachcompartment63 may be slightly larger than a correspondingmodular neck44 such thatcompartments63 form tight tolerances with a correspondingmodular neck44. In this manner, eachmodular neck44 may only be positioned in the correspondingcorrect compartment63, i.e.,modular neck44 designated “N” may only be positioned incompartment63 designated “N”. Eachcompartment63 includesindicator70 which may be etched intocontainer61′ insidecompartment63. In eachcompartment63,indicator70 matches referenceidentifier69 for the correspondingmodular neck44 to be positioned in thatcompartment63.
• Still referring toFIG. 7,container61′ may also includetemplate50′ etched in at least one corner thereof.Template50′ may be a miniaturized version of template50 (FIGS. 3 and 4) to assist a surgeon or surgical assistant during a surgical procedure.Template50′ may depict a left hip joint prosthesis when etched next to the “LEFT STRAIGHT” designation oncontainer61′ and, similarly,template50′ may depict a right hip joint prosthesis when etched next to the “RIGHT STRAIGHT” designation oncontainer61′. Alternatively,template50′ may be adhesively attached tocontainer61′ or carved therein. As shown inFIG. 7,container61′ is in a first position in which a surgeon or surgical assistant may usecontainer61′ with a surgical procedure on the left hip.Container61′ may be rotated 90° in the general direction of Arrow A such thatcontainer61′ is in a second position in which a surgeon or surgical assistant may usecontainer61′ with a surgical procedure on the right hip.
• Container61′ may also be divided intosecondary region78 andprimary region76 which are divided byboundary80.Primary region76 may include a color, pattern, or other identifying structure oncontainer61′ such as to identify a range ofmodular necks44 which are most often used in a surgical procedure.Secondary region78 identifies a range ofmodular necks44 which are less often used in a surgical procedure. Eachcontainer61′ forsubsets60a,60b,and60c(FIGS. 5A,5B, and5C, respectively) may have a different color or other identifying structure to facilitate use with a surgical procedure.
• Container61′ may also include a plurality of removable portions ortrays72. Eachremovable tray72 may be positioned in acorresponding recess74 incontainer61′.Removable tray72 may include one or moremodular necks44 which may be less often used in a surgical procedure.Removable trays72 may be snap-fit into engagement withrecess74 when necessary. If themodular necks44 inremovable trays72 are not necessary,container61′ may be used withouttrays72 positioned therein.
• Although illustrated throughout as having intervals of 4 mm for both offset and leg length,system60 could be arranged to have intervals of any dimension to accommodate the needs of a particular patient or the desires of a particular surgeon. For example, the interval could be 1, 2, 3, 4, or 5 mm, or any fraction thereof, for both offset and leg length.
• The above-described concept has generally been described as a system having three variables, i.e., leg length, offset, and anteversion. The system has been described in which one of these three variables, i.e., the anteversion component, is constant for any given subset of implants having various offsets and leg lengths. For example, the surgeon may pre-operatively choose a desired anteversion component, which may not change intraoperatively, and then need only choose variousmodular necks44 from the subset corresponding to the desired anteversion component ofsystem60 based only on offset and leg length. Alternatively, the system may be constructed such that leg length is the constant variable and the implants of each subset ofsystem60 are arranged to have identical leg lengths and varying offset and anteversion components. In another alternative embodiment, the system may be constructed such that offset is the constant variable and the implants of each subset ofsystem60 are arranged to have identical offsets and varying leg lengths and anteversion components.
• Although described throughout with respect to a hip implant, the method could be utilized in any procedure which uses modular components, for example, but not limited to, shoulder implant procedures, knee implant procedures, etc.
• While this disclosure has been described as having exemplary designs, the present disclosure can be further modified within the spirit and scope of this disclosure. This application is therefore intended to cover any variations, uses, or adaptations of the disclosure using its general principles. Further, this application is intended to cover such departures from the present disclosure as come within known or customary practice in the art to which this disclosure pertains and which fall within the limits of the appended claims.

Claims (20)

1. A system for facilitating implant selection, the system comprising:

a plurality of implants including at least one subset in which at least one of a first, second, and third variable associated with a respective different physical characteristic of the implants is constant and the others of the first, second, and third variables vary within each said subset; and

at least one case including a plurality of receptacles, each said receptacle configured to receive a corresponding one of said plurality of implants, said plurality of receptacles configured to facilitate selection of one of said plurality of implants based on a change in said at least one variable.

2. The system ofclaim 1, wherein the plurality of implants are modular components of a hip implant system and the first variable corresponds to leg length, the second variable corresponds to offset, and the third variable corresponds to anteversion.

3. The system ofclaim 1, wherein said plurality of receptacles are arranged according to each said subset.

4. The system ofclaim 3, wherein the system includes one said case per said subset.

5. The system ofclaim 3, wherein the system includes one said case with multiple said subsets.

6. The system ofclaim 3, wherein the system includes a plurality of cases, each said case including a plurality of receptacles arranged according to each subset.

7. The system ofclaim 1, wherein each said implant is sized slightly smaller than a corresponding said receptacle, wherein each said implant is positionable in only said corresponding receptacle.

8. The system ofclaim 1, wherein said case further includes at least one removable portion.

9. The system ofclaim 1, wherein each said receptacle includes an indicator and each said implant includes an identifier corresponding to each said indicator.

10. The system ofclaim 1, wherein said at least one case further includes at least one template, said template including a grid coordinate system to assess said at least one variable, said grid coordinate system having a plurality of reference points corresponding to at least two of the first, second, and third variables.

11. The system ofclaim 1, wherein said at least one case includes a primary region and a secondary region, at least some of said plurality of implants positioned in said primary region, said primary region corresponding to a group of said plurality of implants primarily utilized.

12. The system ofclaim 1, wherein said case includes at least one anatomical structure identifier.

13. The system ofclaim 12, wherein said case further includes a first anatomical structure identifier and a second anatomical structure identifier, said first anatomical structure identifier configured for use in a first position of said case and said second anatomical structure identifier configured for use in a second position of said case, said first position of said case oriented 90° from said second position of said case.

14. The system ofclaim 1, wherein said case includes a measurement indicia proximate each said receptacle, each said measurement indicia corresponding to at least two of said first, second, and third variables.

15. The system ofclaim 14, wherein said plurality of implants are modular components of a hip implant system and the first variable corresponds to leg length, the second variable corresponds to offset, and the third variable corresponds to anteversion, said measurement indicia corresponding to leg length and offset.

16. A system for facilitating implant selection, the system comprising:

a plurality of implants including at least one subset in which at least one of a first, second, and third variable associated with a respective different physical characteristic of the implants is constant and the others of the first, second, and third variables vary within each said subset; and

receptacle means for receiving each of said plurality of implants and for facilitating selection of one of said plurality of implants based on a change in said at least one variable.

17. The system ofclaim 16, wherein the plurality of implants are modular components of a hip implant system and the first variable corresponds to leg length, the second variable corresponds to offset, and the third variable corresponds to anteversion.

18. The system ofclaim 16, further comprising indication means for indicating a corresponding location of each said implant with respect to said receptacle means.

19. The system ofclaim 16, further comprising assessment means for assessing said at least one variable.

20. The system ofclaim 16, further comprising anatomical indication means for indicating an anatomical structure associated with said plurality of implants.

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