Femoral component of a knee prosthesis

0001The present disclosure relates generally to implantable orthopedic prostheses, and more specifically to implantable knee prostheses.

0002In the patient's life, for example, due to illness or trauma, it may be necessary for the patient to undergo joint replacement surgery. Knee replacement surgery may involve the use of a prosthesis that is implanted in the bone of one or more patients. For knee replacement surgery, a tibial tray is implanted in the patient's tibia. The bearing is fixed to the tibial tray. The condyle surface of the alternative femoral component supports the tibial bearing.

0003During implantation of the femoral component, the surgeon generally preloads bone cement onto the surface of the component that contacts the bone. Preloaded bone cement tends to drain from the femoral component when it is positioned on the surgically prepared distal femur. The anterior movement of the femoral component through the spilled bone cement is called a "cement plow". Both the spilled bone cement and related cement plows lead to the implementation of additional surgical steps to remove the adhered bone cement prior to the completion of the surgery.

<p num="0004"> According to one aspect, the implantable orthopedic knee prosthesis includes a femur component that is configured to be connected to a surgically prepared distal femur. This femoral component has an articular surface that includes the posterior femoral condyle surface. The fixation surface is opposite to the articular surface, which includes a posterior fixation surface that generally extends in the superior / inferior direction. The posterior fixed surface is formed internally and has a deeper posterior cement pocket at its lower end than at its upper end.</p><p num="0005"> The fixation surface of the femoral component may also include a distal fixation surface that extends approximately anteriorly / posteriorly and a posterior chamfered fixation surface that extends superiorly and posteriorly from the distal fixation surface in the direction towards the posterior fixation surface. The posterior chamfered surface may be internally formed and have a posterior chamfered cement pocket adjacent to the posterior cement pocket. Similarly, the distal fixed surface is formed internally and adjacent to the posterior chamfered cement pocket. May have a distal cement pocket.</p><p num="0006"> The posterior cement pocket may be deeper at its lower end than both the posterior chamfered cement pocket and the distal cement pocket.</p><p num="0007"> The fixation surface of the femoral component may also include an anterior fixation surface that extends generally in the superior / inferior direction and an anterior chamfering fixation surface that extends from the distal fixation surface in the superior and anterior directions toward the anterior fixation surface. The anterior chamfer surface may be formed internally and have an anterior chamfered cement pocket adjacent to the distal cement pocket. The anterior fixed surface is formed internally and may include an anterior cement pocket adjacent to the anterior chamfered cement pocket.</p><p num="0008"> In one embodiment, the rear cement pocket is deeper at its lower end than both the front chamfered cement pocket and the front cement pocket.</p><p num="0009"> In one embodiment, the posterior fixed surface includes a mounting edge having a side wall extending posteriorly from the posterior fixed surface. The side wall defines the outer edge of the rear cement pocket. When viewed in the sagittal direction, the lower end of the side wall is wider than the upper end of the side wall.</p><p num="0010"> According to another aspect, the implantable orthopedic knee prosthesis comprises a femur component configured to be connected to a surgically prepared distal femur. The femoral component may include a joint surface having a posterior femoral condyle surface and a fixation surface opposite the joint surface. The fixed surface may include a rear fixed surface that generally extends in the upper / lower direction. The rear fixed surface may include a peripheral edge, a bottom wall that is rearranged from the peripheral edge, and a side wall that extends rearward from the rear edge to the bottom wall. When viewed in the sagittal direction, the virtual plane defined by the periphery forms an acute angle with the virtual plane defined by the bottom wall.</p><p num="0011"> When viewed in the sagittal direction, the lower end of the side wall may be wider than the upper end of the side wall.</p><p num="0012"> In one embodiment, the sidewalls and bottom wall collectively define the cement pocket.</p><p num="0013"> The articular surface may include the posterior lateral femoral condyle surface. The articular surface may also include the posterior medial femoral condyle surface.</p><p num="0014"> According to another aspect, the implantable orthopedic knee prosthesis includes a tibial tray configured to be connected to a surgically prepared proximal tibia and bearings connected to the tibial tray. Bearings include medial and lateral joint surfaces. The knee prosthesis may also include a femoral component configured to be connected to a surgically prepared distal femur. The femoral component may include a lateral condyle surface configured to articulate with the lateral articular surface of the bearing and a medial condyle configured to articulate with the medial articular surface of the bearing. The femoral component may also include a posterolateral fixation surface opposite the lateral condyle surface, with the posterolateral fixation surface extending in the superior / inferior direction. The femoral component also includes the posterior medial fixation surface opposite the medial condyle surface, with the posterior medial fixation surface extending in the superior / inferior direction. Both the posterior medial fixation surface and the posterior lateral fixation surface may include a peripheral edge, a bottom wall that is rearranged from the peripheral edge, and a side wall that extends rearward from the posterior edge to the bottom wall. When viewed in the sagittal direction, the virtual plane defined by the periphery forms an acute angle with the virtual plane defined by the bottom wall.</p><p num="0015"> When viewed in the sagittal direction, the lower end of the side wall of the rear inner fixed surface is wider than the upper end.</p><p num="0016"> When viewed in the sagittal direction, the lower end of the side wall of the rear outer fixed surface is wider than the upper end.</p><p num="0017"> The sidewalls and bottom wall of the posterior medial fixed surface collectively define the cement pocket.</p><p num="0018"> The side walls and bottom wall of the rear outer fixed surface also collectively define the cement pocket.</p><p num="0019"> According to another aspect, the implantable orthopedic knee prosthesis comprises a femur component configured to be connected to a surgically prepared distal femur. The femoral component has a joint surface including the surface of the femoral condyle and a fixation surface opposite to the joint surface. The fixed surface includes a fixed surface that generally extends in the upper / lower direction. The fixed surface is formed internally and has deeper cement pockets at its lower end than at its upper end.</p><p num="0020"> The fixed surface may also include a mounting edge having a side wall extending from the fixed surface. The side wall defines the outer edge of the cement pocket. When viewed in the sagittal direction, the lower end of the side wall is wider than the upper end of the side wall.</p><p num="0021"> When viewed in the sagittal direction, the virtual plane defined by the periphery forms an acute angle with the virtual plane defined by the bottom wall.</p><p num="0022"> The fixed surface may include a rear fixed surface with a rear cement pocket formed inside. In such a configuration, the bottom wall is rearranged from the periphery and the side walls extend rearward from the rear edge to the bottom wall.</p><p num="0023"> The fixed surface may include a front fixed surface having an internally formed front cement pocket. In such a configuration, the bottom wall is separated forward from the periphery and the side walls extend forward from the front edge to the bottom wall.</p><p num="0024"> The femoral component may be embodied as a monocondylar femoral component.</p>

0025The "mode for carrying out the invention" particularly relates to the following drawings.<figref num="1">Perspective view of the knee prosthesis.</figref><figref num="2">An exploded perspective view of the knee prosthesis of FIG.</figref><figref num="3">A perspective view of the femoral component of the knee prosthesis in Figure 1.</figref><figref num="4">Sagittal cross-sectional view of the femoral component of FIG.</figref><figref num="5">Enlarged fragment of the portion of Figure 4, showing the posterior condyle of the femoral component in more detail.</figref><figref num="6">Similar to FIG. 4, but showing another embodiment of the femoral component, where both the posterior and anterior cement pockets are angled.</figref><figref num="7">Perspective view of a single condyle femoral component.</figref><figref num="8">A sagittal cross-sectional view of the monocondylar femoral component of FIG.</figref>

0026Various modifications and alternative forms of the concept of the present disclosure are conceivable, the particular exemplary embodiments of which are illustrated in the drawings and are described in detail herein. However, it is not intended to limit the concept of the present disclosure to a specific form to be disclosed, and conversely, it is included in the purpose and scope of the invention defined in the attached "Claims". It should be understood that it is intended to cover all variants, equivalents and alternatives.

0027The terms anterior, posterior, medial, lateral, superior, inferior, etc. for anatomical reference refer to the orthopedic implants described herein and the patient's natural anatomy throughout this disclosure. Can be used for both. These terms have meanings that are well understood in both the fields of anatomical structure research and orthopedics. The use of these anatomical reference terms in the specification and claims is intended to be consistent with their well-understood meaning, unless otherwise stated.

0028Here, referring to FIGS. 1 to 5, the knee prosthesis 10 is shown. The knee prosthesis 10 includes a femoral component 12, a tibial tray 14, and a bearing 16. The femur component 12 is configured to be anchored to the surgically prepared end of the patient's distal femur (not shown), while the tibial tray 14 is the patient's proximal tibia (not shown). It is configured to be fixed to a surgically prepared end (not shown).

0029The tibial tray 14 includes a fixation member that extends away from its lower surface, eg, a platform 18 with an elongated stem 20. Bearing 16 includes a stem 22 (see FIG. 2) that can be positioned within an auxiliary hole 24 (FIG. 2) in the tibial tray 14. In such a method, the bearing 16 can rotate freely with respect to the tibial tray 14. In other embodiments, the bearing 16 may be snap-fitted or otherwise secured to the tibial tray 14. In this way, the bearing 16 is secured to the tibial tray 14 (ie, it is not rotatable or movable in the anterior / posterior or medial / lateral directions). It should be understood that in such embodiments, other fixing members, such as one or more short pegs or columns, may be used in place of the elongated stem 20.

0030Bearing 16 includes lateral joint surface 26 and medial joint surface 28. The joint surfaces 26 and 28 are configured to form joints with the lateral condyle surface 30 and the medial condyle surface 32 of the femur component 12, respectively. Specifically, the femoral component 12 is configured to mimic the composition of the patient's natural femoral condyle, so that the lateral condyle surface 30 and medial condyle surface 32 mimic the natural femoral condyle. It is composed of methods (for example, curved). The lateral condyle surface 30 and the medial condyle surface 32 are separated from each other, thereby defining an intercondylar notch between them.

0031The components of the knee prosthesis 10 that engage the natural bone, such as the femur component 12 and the tibial tray 14, may be composed of biocompatible metals such as cobalt-chromium alloys, but other materials such as ceramics may also be used. .. The surface of these components that engage the bone can be unsmoothed to facilitate adhesion to the component to the bone. Such surfaces can be coated with porosity to promote internal bone growth for permanent fixation.

0032The bearing 16 may be composed of a material such as a polymeric material that allows a smooth joint between the bearing 16 and the femur component 12. One such polymeric material is polyethylene, such as ultra high molecular weight polyethylene (UHMWPE), but other biocompatible polymers may be used.

0033The femoral component 12 is described herein as an integral component for explanatory purposes, but it is characterized by many "areas" or "structures". For example, the anterior structure of the femur component 12 is called the anterior flange 34. The anterior flange 34 transitions to the anterior chamfer region 36, which in turn transitions to the distal condyle region 38. The distal condyle region 38 transitions to the posterior chamfered region 40. The pair of posterior femoral condyles 42 forms the posterior structure of the femoral component 12.

0034As shown in FIG. 2, both the lateral condyle surface 30 and the medial condyle surface 32 are formed on the articular surface 44 of the femoral component 12. The fixation surface 48 is the surface of the femur component 12 that is opposite the articular surface 44 and is in contact with the patient's surgically prepared distal femur. The fixation surface 48 includes a plurality of surfaces that fit into a flat surface surgically cut into the patient's distal femur. Specifically, as shown in FIG. 3, the pair of posterior fixation surfaces 50 are opposite to the posterior condyle surface 52, one of the posterior fixation surfaces 50 is the medial fixation surface and the other is lateral. It is a fixed surface. As can be seen in FIG. 4, the rear fixed surface 50 extends generally in the upper / lower direction. The pair of distal fixed surfaces 58 (one positioned medially and the other laterally) are opposite to the distal condyle surface 60. The distal fixed surface 58 extends approximately in the anterior / posterior direction. The medial and lateral posterior chamfered fixed surfaces 54 are opposite to the posterior chamfered condyle surface 56. The medial and lateral posterior chamfered fixation surfaces 54 extend superiorly and posteriorly from their corresponding medial and lateral distal fixation surfaces 58 in the direction towards their corresponding posterior fixation surfaces 50. The medial and lateral anterior chamfered fixed surfaces 62 are opposite to the anterior chamfered condyle surface 64, respectively, in the direction towards the anterior fixed surface 66, superior and anteriorly laterally from their corresponding distal fixed surfaces 58. Extend. The anterior fixed surface 66 is opposite to the anterior condyle surface 68 and, like the posterior fixed surface 50, generally extends in the superior / inferior direction.

0035Each of the fixed surfaces has a cement pocket formed inside. Specifically, the rear cement pocket 70 is formed on each of the rear fixed surfaces 50, the rear chamfered cement pocket 72 is formed on each of the rear chamfered fixed surfaces 54, and the distal cement pocket 74 is distal. Formed on each of the fixed surfaces 58, the anterior chamfered cement pocket 76 is formed on each of the anterior chamfered fixed surfaces 62, and the anterior cement pocket 78 is formed on the anterior fixed surface 66. In the exemplary embodiments described herein, adjacent cement pockets are adjacent to each other such that a single continuous cement pocket is formed on the fixation surface 48 of the femoral component.

0036Each of the cement pockets 70, 72, 74, 76, 78 is formed by a side wall 80 extending outward from the mounting edge 82. As can be seen in FIGS. 3-5, the side wall 80 forms the outer edges of the cement pockets 70, 72, 74, 76 and 78, respectively. The bottom wall 84 is connected to it by a side wall 80 from a mounting edge 82. In such a manner, the side wall 80 and the bottom wall 84 collectively define the corresponding cement pockets 70, 72, 74, 76, 78.

0037Depth of each of the rear chamfered cement pocket 72, the distal cement pocket 74, the anterior chamfered cement pocket 76, and the anterior cement pocket 78 (D).₁) Are approximately equal. In the exemplary embodiments described herein, each of the cement pockets 72, 74, 76, and 78 is approximately 1 mm deep (ie, D).₁= 1mm).

0038On the other hand, the rear cement pocket 70 is angled as a result and is deeper at its lower end than above its upper end. Specifically, as shown in FIG. 5, the rear cement pocket 70 is formed by a side wall 80'extending rearward from the mounting edge 82'of the rear fixed surface 50 to the bottom wall 84'. When viewed in the sagittal direction, for example, in the cross-sectional views of FIGS. 4 and 5, the lower end 86 of the side wall 80'is wider than the upper end 88 of the side wall 80'. As a result, the rear cement pocket 70 is deeper at its lower end 90 than at its upper end 92. In the exemplary embodiments described herein, the top end 92 of the rear cement pocket 70 is approximately equal to the depth of the other cement pockets 72, 74, 76, and 78. In other words, the upper end 92 of the rear cement pocket 70 is about 1 mm deep (ie, D).₁= 1mm). However, the lower end 90 of the rear cement pocket 70 is 1.5 mm deep for explanatory purposes (ie, D).₂= 1.5mm). It will be appreciated that other dimensions may also be used to meet the given design requirements of the femoral component 12.

0039Such a configuration creates an angled bottom wall 84'. Specifically, the bottom wall 84'inclins forward from its lower end 86 to its upper end 88. This slanted configuration is shown in the cross-sectional view of FIG. 5 for explanatory purposes. As can be seen in the figure, the virtual surface 94 is defined by the mounting edge 82'of the rear fixed surface 50, whereas the bottom wall 84'of the rear fixed surface 50 defines the virtual surface 96. To do. The two virtual surfaces 94 and 96 form an acute angle (θ) between them. Such an acute angle indicates the inclination of the bottom wall 84'with respect to the mounting edge 82'.

0040Cement pockets 70, 72, 74, 76, 78 are preloaded with bone cement during surgery to implant the femur component 12 into the surgically prepared distal end of the patient's femur. The femur component 12 is then positioned on the patient's surgically prepared distal femur, which is also already coated with bone cement. The angle thrust configuration of the rear cement pocket 70 is a hydraulic loading of bone cement into the cement pocket. This enhances the confinement of bone cement and reduces the occurrence of cement plows. The configuration of the posterior cement pocket 70 also improves the filling and pressurization of bone cement, which in turn leads to a stronger attachment of the femur component 12 to the distal femur.

0041With reference to FIG. 6, another embodiment of the femur component 12 is shown. In this embodiment, both the rear cement pocket 70 and the front cement pocket 78 are angled. As such, both cement pockets 70, 78 are deeper at the lower end of their correspondence than at the upper end of their correspondence. In the embodiment shown in FIG. 6, the rear cement pocket 70 is essentially the same as above with respect to FIGS. 1-5. With respect to the anterior cement pocket 78, it is formed by a side wall 80 "extending forward from the attachment edge 82" of the anterior fixed surface 66 to the bottom wall 84 ". When, the lower end 106 of the side wall 80 "is wider than the upper end 108 of the side wall 80". As a result, like the rear cement pocket 70, the front cement pocket 78 is at its lower end 110, its upper end. Deeper than in 112. In the exemplary embodiment described herein, the upper end 112 of the anterior cement pocket 78 is approximately equal to the depth of the other cement pockets 72, 74, and 76, in other words. The upper end 112 of the front cement pocket 70 is about 1 mm deep (ie, D).₁= 1mm). However, the lower end 110 of the front cement pocket 78 is 1.5 mm deep for explanatory purposes (ie, D).₂= 1.5mm). It will be appreciated that other dimensions may also be used to meet the given design requirements of the femoral component 12.

0042Such a configuration creates an angled bottom wall 84 ". Specifically, the bottom wall 84" of the front cement pocket 78 slopes rearward from its lower end 106 to its upper end 108. This sloping configuration is shown in FIG. 6 for explanatory purposes, where the virtual surface 114 is defined by the mounting edge 82 of the front fixed surface 66, while the bottom wall 84 of the front fixed surface 66. Defines the virtual surface 116. The two virtual surfaces 114 and 116 form an acute angle (β) between them. Such an acute angle indicates the inclination of the bottom wall 84 "with respect to the mounting edge 82".

0043Cement pockets 70, 72, 74, 76, 78 are preloaded with bone cement during surgery to implant the femur component 12 of FIG. 6 into the surgically prepared distal end of the patient's femur. The femur component 12 is then positioned on the patient's surgically prepared distal femur, which is also already coated with bone cement. The angled configuration of cement pockets 70, 78 hydraulically loads bone cement into cement pockets 70, 78. This enhances the confinement of bone cement and reduces the occurrence of cement plows. This also improves the filling and pressurization of bone cement, which in turn leads to a stronger attachment of the femur component 12 to the distal femur.

0044Although the embodiment of FIG. 6 shows both the angled rear cement pocket 70 and the anterior cement pocket 78 for explanatory purposes, it should be understood that other embodiments are also conceived. For example, as shown in FIGS. 1-5, the femoral component 12 may be embodied with only an angled posterior cement pocket 70. Alternatively, the femoral component 12 may be embodied only in the angled anterior cement pocket 78.

0045With reference to FIGS. 7 and 8, the femoral component 12 may also be embodied as a monocondylar femoral component. As in other embodiments described herein, the posterior cement pocket 70 of the monocondylar femoral component 12 may be angled. The angled configuration of the posterior cement pocket 70 hydraulically loads bone cement into the cement pocket. This enhances the confinement of bone cement and reduces the occurrence of cement plows. The configuration of the posterior cement pocket 70 also improves the filling and pressurization of bone cement, which in turn leads to the strengthening of the joint of the monocondylar femur component 12 to the distal femur.

0046Although the contents of the present disclosure have been illustrated and explained in detail in the drawings and the above description, such illustrations and explanations should be regarded as exemplary by their nature and should not be regarded as limiting. It will be appreciated that all changes and modifications contained within the scope of the present disclosure should be protected, provided that they are merely exemplary embodiments and explanations.

0047The present disclosure has many advantages based on the various features of the devices, systems, and methods described herein. Alternative embodiments of the devices, systems, and methods of the present disclosure do not include all of the features described herein, but benefit from at least some of these advantages. One of ordinary skill in the art shall independently implement the devices, systems, and methods included in the gist and scope of the present disclosure as defined in the "Claims" that incorporate one or more features of the present invention. Would be easily possible.

0048[Implementation] (1) An implantable orthopedic knee prosthesis comprising a femur component configured to be connected to a surgically prepared distal femur, said femur component: (i) posterior femur. It has a joint surface including the surface of the femoral condyle and (ii) a fixation surface opposite to the joint surface, and the fixation surface includes a posterior fixation surface extending substantially in the superior / inferior direction and said posterior fixation. The surface has a posterior cement pocket formed inside, the posterior cement pocket at its lower end, deeper than at its upper end, an implantable orthopedic knee prosthesis. (2) The fixation surface of the femoral component is directed towards the distal fixation surface (i) extending approximately anteriorly / posteriorly and (ii) superior and posterior to the distal fixation surface. Further including a rear chamfered fixed surface that extends in the direction, The rear chamfered surface is formed internally and has a rear chamfered cement pocket adjacent to the rear cement pocket. The implantable orthopedic prosthesis according to embodiment 1, wherein the distal fixation surface is formed internally and has a distal cement pocket adjacent to the posterior chamfered cement pocket. (3) The implantable orthopedic prosthesis according to embodiment 2, wherein the posterior cement pocket is deeper at its lower end than both the posterior chamfered cement pocket and the distal cement pocket. (4) The fixation surface of the femur component faces the anterior fixation surface (i) substantially extending in the superior / inferior direction and (ii) superior and anterior from the distal fixation surface. Further including a front chamfered fixed surface that extends in the direction, The anterior chamfer surface is formed internally and has an anterior chamfered cement pocket adjacent to the distal cement pocket. The implantable orthopedic prosthesis according to embodiment 3, wherein the anterior fixation surface is formed internally and has an anterior cement pocket adjacent to the anterior chamfered cement pocket. (5) The implantable orthopedic prosthesis according to embodiment 4, wherein the posterior cement pocket is deeper at its lower end than both the anterior chamfered cement pocket and the anterior cement pocket. (6) The rear fixed surface includes a mounting edge, the mounting edge having a side wall extending rearward from the mounting edge. The side wall defines the outer edge of the rear cement pocket. The implantable orthopedic prosthesis according to embodiment 1, wherein the lower end of the side wall is wider than the upper end of the side wall when viewed in the sagittal direction. (7) An implantable orthopedic knee prosthesis comprising a femur component configured to be connected to a surgically prepared distal femur, said femur component: (i) posterior femur. It has a joint surface including the surface of the femoral condyle and (ii) a fixation surface opposite to the joint surface, the fixation surface including a posterior fixation surface extending generally in the superior / inferior direction. The rear fixed surface includes (i) a peripheral edge, (ii) a bottom wall that separates rearward from the peripheral edge, and (iii) a side wall that extends rearward from the posterior edge to the bottom wall. An implantable orthopedic knee prosthesis that, when viewed in the sagittal direction, forms an acute angle with the virtual surface defined by the peripheral edge. (8) The implantable orthopedic knee prosthesis according to embodiment 7, wherein the lower end of the side wall is wider than the upper end of the side wall when viewed in the sagittal direction. (9) The implantable orthopedic knee prosthesis according to embodiment 7, wherein the side wall and the bottom wall collectively define a cement pocket. (10) The implantable orthopedic knee prosthesis according to embodiment 7, wherein the articular surface comprises the posterior lateral femoral condyle surface.

0049(11) The implantable orthopedic knee prosthesis according to embodiment 7, wherein the articular surface comprises the posterior medial femoral condyle surface. (12) A tibial tray configured to connect to a surgically prepared proximal tibia, A bearing connected to the tibial tray, wherein the bearing has a medial and lateral joint surfaces, and A femoral component configured to be connected to a surgically prepared distal femur, the femur component being configured to (i) articulate with the lateral articular surface of the bearing. The lateral condyle surface, the medial condyle configured to articulate with the medial joint surface of the bearing, and (ii) the posterolateral fixed surface opposite to the lateral condyle surface in the superior / inferior direction. A femoral component having a posterior lateral fixation surface extending in and (iii) a posterior medial fixation surface opposite to the medial condyle surface, extending in the superior / inferior direction. Is an implantable orthopedic knee prosthesis, including, Both the posterior medial fixation surface and the posterior lateral fixation surface are (i) a peripheral edge, (ii) a bottom wall that is rearranged from the peripheral edge, and (iii) rearward from the posterior edge to the bottom wall. Including extending side walls An implantable orthopedic knee prosthesis that, when viewed in the sagittal direction, forms an acute angle with the virtual surface defined by the peripheral edge. (13) The implantable orthopedic knee prosthesis according to embodiment 12, wherein the lower end of the side wall of the posterior medial fixation surface is wider than the upper end when viewed in the sagittal direction. (14) The implantable orthopedic knee prosthesis according to embodiment 12, wherein the lower end of the side wall of the posterior lateral fixed surface is wider than the upper end when viewed in the sagittal direction. (15) The implantable orthopedic knee prosthesis according to embodiment 12, wherein the side walls and the bottom wall of the posterior medial fixation surface collectively define a cement pocket. (16) The implantable orthopedic knee prosthesis according to embodiment 12, wherein the side walls and the bottom wall of the posterior lateral fixed surface collectively define a cement pocket. (17) An implantable orthopedic knee prosthesis that includes a femoral component configured to be connected to a surgically prepared distal femur, said femoral component (i) the surface of the femoral condyle. It has a including joint surface and (ii) a fixed surface on the opposite side of the joint surface, the fixed surface includes a fixed surface extending generally in the upper / lower direction, and the fixed surface is formed inside. An implantable orthopedic knee prosthesis that has a cement pocket that is deeper at its lower end than at its upper end. (18) The fixed surface includes a mounting edge, the mounting edge having a side wall extending from it. The side wall defines the outer edge of the cement pocket. The implantable orthopedic prosthesis according to embodiment 17, wherein the lower end of the side wall is wider than the upper end of the side wall when viewed in the sagittal direction. (19) The implantable orthopedic knee according to embodiment 18, wherein the virtual surface defined by the peripheral edge forms an acute angle with the virtual surface defined by the bottom wall when viewed in the sagittal direction. Prosthesis. (20) The fixed surface includes a rear fixed surface having a rear cement pocket formed inside. The bottom wall is separated rearward from the peripheral edge. The implantable orthopedic knee prosthesis according to embodiment 19, wherein the side wall extends posteriorly from the posterior edge to the bottom wall.

0050(21) The fixed surface includes a front fixed surface having an internally formed front cement pocket. The bottom wall is separated forward from the peripheral edge. The implantable orthopedic knee prosthesis according to embodiment 19, wherein the side wall extends anteriorly from the anterior edge to the bottom wall. (22) The implantable orthopedic knee prosthesis according to embodiment 17, wherein the femoral component comprises a unicondylar femoral component.