Veterinary medial patellar luxation bone plates

Abstract

Bone plates are disclosed for veterinary uses. For example, the bone plates could be utilized for repairing medial patellar luxation in animals, such as canines, felines, or equines, for example. The bone plates may include various features for better accommodating the anatomy and native tissue structure of the proximal tibia of the animal.

Description

2024-124-RND-PCT; 67145-811 PCTVETERINARY MEDIAL PATELLAR LUXATION BONE PLATESCROSS-REFERENCE TO RELATED APPLICATIONS[oooi] This application claims the benefit of United States Provisional Application No. 63 / 681,497, which was filed on August 9, 2024 and is incorporated herein by reference in its entirety.BACKGROUND

[0002] Medial patellar luxation is a common condition in stifle joints of canines or other quadruped animals in which the patella of the stifle joint shifts medially out of its native position within the femoral groove. In some instances, medial patellar luxation may be so severe that surgical intervention is necessary in order to restore joint kinematics and reduce pain.SUMMARY

[0003] This disclosure is directed to bone plates for repairing medial patellar luxation in animals, such as canines, felines, and equines, for example.

[0004] An exemplary medial patellar luxation bone plate designed for veterinary use may include, inter alia, a shaft portion, a head portion, a bone contacting surface, an outer surface opposed to the bone contacting surface, and a step provided at the bone contacting surface and configured to position the head portion at an inclined angle relative to the shaft portion. The step includes a curved surface.[ooos] An exemplary surgical method for repairing medial patellar luxation of a stifle joint may include, inter alia, performing a curvilinear osteotomy cut that separates a proximal bone fragment from a main portion of a tibia of the stifle joint, aligning a bone plate to the tibia such that a curved surface of a step of the bone plate aligns to the curvilinear osteotomy cut, simultaneously rotating and translating the proximal bone fragment relative to the main portion of the tibia, and fixating the bone plate to the proximal bone fragment and the main portion of the tibia.2024-124-RND-PCT; 67145-811 PCTBRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 illustrates select portions of a canine stifle joint. The stifle joint includes a medial patellar luxation condition that requires surgical repair.

[0007] Figure 2 is a perspective view of a bone plate for repairing medial patellar luxation of a stifle joint.

[0008] Figure 3 is a top view of the bone plate of Figure 2.

[0009] Figure 4 is a bottom view of the bone plate of Figure 2.[oooio] Figure 5 is a first side view of the bone plate of Figure 2.[oooii] Figure 6 is a second side view of the bone plate of Figure 2.[ooon] Figure 7 is an end view of the bone plate of Figure 2.

[0013] Figure 8 is a blown-up top view of a head portion of the bone plate of Figure 2.[oooi4] Figure 9 is a blown-up bottom view of the head portion of Figure 8.[ooois] Figure 10 illustrates the bone plate of Figures 2-9 positioned relative to a canine proximal tibia.

[0016] Figure 11 illustrates bone plates of various sizes for repairing medial patellar luxation within a stifle joint.

[0017] Figures 12, 13, 14, 15, 16, and 17 schematically illustrate a surgical method for repairing medial patellar luxation of a stifle joint of a quadruped animal.DETAILED DESCRIPTION[ooois] This disclosure is directed to bone plates designed for veterinary use. For example, the bone plates could be utilized for repairing medial patellar luxation conditions of stifle joints of canines, felines, equines, or other quadruped animals. These and other features of this disclosure are described in further detail below.

[0019] An exemplary medial patellar luxation bone plate designed for veterinary use may include, inter alia, a shaft portion, a head portion, a bone contacting surface, an outer surface opposed to the bone contacting surface, and a step provided at the bone contacting surface and configured to position the head portion at an inclined angle relative to the shaft portion. The step includes a curved surface.

[0020] In any further embodiment, the bone contacting surface is contoured to conform to a proximal tibia.2024-124-RND-PCT; 67145-811 PCT

[0021] In any further embodiment, the proximal tibia is a canine proximal tibia.

[0022] In any further embodiment, a plurality of openin s and at least one K-wirc hole arc formed through the head portion.

[0023] In any further embodiment, the plurality of openings includes at least a first opening and a second opening, and the first opening and the second opening extend through the head portion along different angles.

[0024] In any further embodiment, the plurality of openings includes a third opening, and the first opening, the second opening, and the third opening extend through the head portion along different angles.

[0025] In any further embodiment, a plurality of openings and at least one K-wire hole are formed through the shaft portion.

[0026] In any further embodiment, a compression slot is formed through the shaft portion at a location that is between a first opening of the plurality of openings and a second opening of the plurality of openings.

[0027] In any further embodiment, the head portion is bounded by a peripheral edge that connects the head portion to a cranial side and a caudal side of the shaft portion.

[0028] In any further embodiment, the peripheral edge includes a first curved peak on the cranial side, a second curved peak at the caudal side, and a third curved peak between the first curved peak and the second curved peak.

[0029] In any further embodiment, the shaft portion and the head portion extend along a longitudinal axis, and the head portion extends along a centerline axis that is transverse to the longitudinal axis to angle the head portion relative to the shaft portion.

[0030] In any further embodiment, the head portion is angled between about 20 degrees and about 25 degrees relative to the shaft portion.

[0031] In any further embodiment, the curved surface extends from a cranial side to a caudal side of the medial patellar luxation bone plate.

[0032] In any further embodiment, the curved surface is configured to match a curvature of a curvilinear osteotomy cut.

[0033] In any further embodiment, a height of the step is between about 1.4 mm and about 4.5 mm.2024-124-RND-PCT; 67145-811 PCT

[0034] An exemplary surgical method for repairing medial patellar luxation of a stifle joint may include, inter alia, performing a curvilinear osteotomy cut that separates a proximal bone fragment from a main portion of a tibia of the stifle joint, aligning a bone plate to the tibia such that a curved surface of a step of the bone plate aligns to the curvilinear osteotomy cut, simultaneously rotating and translating the proximal bone fragment relative to the main portion of the tibia, and fixating the bone plate to the proximal bone fragment and the main portion of the tibia.

[0035] In any further embodiment, simultaneously rotating and translating the proximal bone fragment includes rotating the proximal bone fragment crania-caudally, and translating the proximal bone fragment latero-medially.

[0036] In any further embodiment, simultaneously rotating and translating the proximal bone fragment includes rotating the proximal bone fragment medially.

[0037] In any further embodiment, simultaneously rotating and translating the proximal bone fragment reduces the medial patellar luxation, thereby re-seating a patella of the stifle joint within a femoral groove.

[0038] Figure 1 schematically illustrates a stifle joint 10 of hindlimb of a quadruped animal. In an embodiment, the stifle joint 10 is that of a canine. However, the teachings of this disclosure may be applicable for other veterinary uses, such as for felines or equines, for example. The stifle joint 10 includes a femur 12, a tibia 14, and a patella 16.

[0039] As schematically illustrated, the stifle joint 10 includes a condition known as medial patellar luxation in which the patella 16 has moved in a medial direction MD away from its native position within a femoral groove 18 of the femur 12. Medial patellar luxation must be repaired in order to alleviate pain and facilitate proper joint kinematics of the stifle joint 10. The medial patellar’ luxation may be repaired using a bone plate. This disclosure is therefore directed to bone plate designs that are specifically suited for performing medial patellar luxation repairs within quadruped animals (e.g., non-humans such as canines, felines, and equines).

[0040] Figures 2-10, with continued reference to Figure 1, illustrate an exemplary bone plate 20 for repairing medial patellar luxation of a stifle joint 10 of a quadruped animal, such as a canine, feline, or equine, for example. The bone plate 20 is shown alone in Figures 2-9, and the bone plate 20 is shown positioned relative to the tibia 14 of the stifle joint 10 in Figure 10.2024-124-RND-PCT; 67145-811 PCT

[0041] The bone plate 20 may be made from any biocompatible material or combination of biocompatiblc materials. Exemplary materials that may be suitable for manufacturing the bone plate 20 include, but are not limited to, titanium, titanium alloys, stainless steel, thermoplastic materials, etc.

[0042] The bone plate 20 may extend along a longitudinal axis A (see Figure 3) between a head portion 22, located proximally when the bone plate 20 is implanted, and a shaft portion 24, located distally when the bone plate 20 is implanted (see, e.g., Figure 10). Together, the head portion 22 and the shaft portion 24 establish a single-piece, unitary bone plate structure.

[0043] The bone plate 20 may be specifically sized and shaped for use relative a proximal section of the tibia 14 of a canine or some other quadruped animal, for example. In particular, the bone plate 20 may be anatomically contoured to the proximal tibia in each of an X-axis, Y-axis, and Z-axis of a cartesian coordinate system 25 for accommodating multiple breed sizes and shapes and / or for accommodating other bones having a similar’ geometric structure as the proximal tibia.

[0044] The bone plate 20 may include a bone contacting surface 28 and an outer surface 26 on an opposite side of the bone plate 20 from the bone contacting surface 28. The bone contacting surface 28 may include a slightly concave curvature 30 (see, e.g., Figure 7) for conforming to the convex contour of the proximal tibia.

[0045] The longitudinal axis A may bisect the shaft portion 24 into two sections. In some implementations, the shaft portion 24 may be substantially symmetrical about the longitudinal axis A.

[0046] The head portion 22 may be bounded by a peripheral edge 32. The peripheral edge 32 may protrude outwardly at two or more curved peaks. In the exemplary embodiment, the peripheral edge 32 includes a first curved peak 34 at a first or cranial side of the head portion 22, a second curved peak 36 at a second or caudal side of the head portion 22, and a third curved peak 38 located between the first curved peak 34 and the second curved peak 36. The third curved peak 38 may establish a proximal-most tip of the bone plate 20 when implanted. The longitudinal axis A may intersect through a portion of the first curved peak 34 (see Figure 3).

[0047] The head portion 22 may be angled in the X-Y plane relative to the shaft portion 24 to allow the bone plate 20 to conform to the anatomy of the tibial tuberosity and provide optimal fixation of the bone plate 20 to the tibia 14 as part of a medial patellar luxation repair. For example, the head portion 22 may project in a direction away from the shaft portion 24 along a centerline2024-124-RND-PCT; 67145-811 PCT axis B that is transverse to the longitudinal axis A (see Figure 3). The centerline axis B may bisect the head portion 22 in two parts and may intersect the head portion 22 through the third curved peak 38. The centerline axis B extends at an angle a relative to the longitudinal axis A to establish the angled relationship between the head portion 22 and the shaft portion 24. In an embodiment, the angle a is between about 20 degrees and about 25 degrees. However, other angles could be possible depending on the anatomy of the patient, among various other factors. In this disclosure, the term ‘‘about” means that the expressed quantities or ranges need not be exact but may be approximated and / or larger or smaller, reflecting acceptable tolerances, conversion factors, measurement error, etc.

[0048] A first opening 40 may be formed through the head portion 22 at a location that is proximate to the first curved peak 34, a second opening 42 may be formed through the head portion 22 at a location that is proximate to the second curved peak 36, and a third opening 44 may be formed through the head portion 22 at a location that is proximate to the third curved peak 38. Additional openings could be formed through the head portion 22 depending on the size of bone plate 20 and its intended application (see, e.g., bone plate 20-8 of Figure 11).

[0049] The first opening 40, the second opening 42, and the third opening 44 may each extend completely through the head portion 22 and therefore open through both the bone contacting surface 28 and the outer surface 26. The first opening 40, the second opening 42, and the third opening 44 may be threaded openings that are configured to receive a fixation device (e.g., a locking screw) for fixating the bone plate 20 to the tibia 14.

[0050] In an embodiment, the first opening 40, the second opening 42, and the third opening 44 are equally sized openings. In another embodiment, the longitudinal axis A intersects through the first opening 40 but does not intersect through the second opening 42 or the third opening 44 due to the angled relationship between the head portion 22 and the shaft portion 24. In yet another embodiment, the centerline axis B intersects through the third opening 44 but does not intersect through either of the first opening 40 or the second opening 44.

[0051] Each of the first opening 40, the second opening 42, and the third opening 44 may be an angled opening that maximizes bone purchase into the proximal tibia. In an embodiment, first opening 40, the second opening 42, and the third opening 44 are angled at different angles relative to one another for promoting superior fixation and reducing risk of screw or plate failure.2024-124-RND-PCT; 67145-811 PCT

[0052] The shaft portion 24 may include a plurality of openings 46 configured for receiving additional fixation devices (c.g. locking screws, etc.) for fixating the bone plate 20 to the tibia 14. The openings 46 may be threaded openings that extend completely through the shaft portion 24 and therefore open through both the bone contacting surface 28 and the outer surface 26. In an embodiment, the shaft portion 24 includes two or three openings 46 that are equally sized and aligned along the longitudinal axis A. However, other configurations are also contemplated, and thus the total number of openings 46 and their specific arrangement within the shaft portion 24 are not intended to limit this disclosure.

[0053] The shaft portion 24 may additionally include a compression slot 48, which can include an elongated or oval shape, that is configured to receive a fixation device (e.g., a compression screw). The compression slot 48 allows the bone plate 20 to be used in conjunction with a corrective osteotomy fixation as part of the medial patellar luxation repair. The compression slot 48 may be positioned between two of the openings 46 and could be either aligned or offset from the openings 46 along the longitudinal axis A. Other configurations are also contemplated, and thus the specific arrangement of the compression slot 48 within the shaft portion 24 is not intended to limit this disclosure.

[0054] The bone plate 20 may additionally include a plurality of K-wire holes 50 configured for receiving a K-wire, BB-tak, or some other preliminary fixation device in order to temporarily secure the bone plate 20 to the tibia 14 prior to achieving final fixation via fixation screws. The K-wire holes 50 extend completely through the bone plate 20 and therefore open through both the bone contacting surface 28 and the outer surface 26. In an embodiment, the bone plate 20 includes two K-wire holes 50 formed in the shaft portion 24 and one K-wire hole 50 formed in the head portion 22. However, the total number and placement of the K-wire holes 50 provided in the bone plate 20 is not intended to limit this disclosure.

[0055] A plurality of undercuts 52 (best shown in Figure 4) may be formed in the shaft portion 24 of the bone plate 20. The undercuts 52 are designed to limit bone contact and enhance blood supply at the plate-to-bone interface.

[0056] A suture hole 54 may be formed through the head portion 22 of the bone plate 20. The suture hole 54 may be configured for receiving a suture or other threadlike material for restraining rotation of the stifle joint 10.2024-124-RND-PCT; 67145-811 PCT

[0057] One or more additional suture holes 56 may be formed through the shaft portion 24 of the bone plate 20. The suture holes 56 may be configured for receiving sutures or other threadlike materials for securing soft tissue to the bone plate during surgical closure and for reducing irritations.

[0058] The bone plate 20 may include a transition zone 58 where the plate transitions between the head portion 22 and the shaft portion 24. The portion of the transition zone 58 located at the outer surface 26 may include a substantially smooth sloped section 60 that eases closure and reduces soft tissue irritations.

[0059] A laser line 62 may be provided within the transition zone 58 at the outer surface 26. The laser line 62 may be utilized to align the bone plate 20 relative to a surface cut of an osteotomy, such as during a medial patellar luxation repair, for example. In an embodiment, the laser line 62 is an arcuate line.

[0060] A cranial edge relief 64 may also be provided within the transition zone 58 at the outer surface 26 of the bone plate 20. The cranial edge relief 64 is essentially an area of the outer surface 26 that has a reduced amount of material compared to other portions of the outer surface 26. The cranial edge relief 64 is configured to ease tissue closure over the bone plate 20 by increasing the amount of space provided for passing sutures or other surgical closure products. In an embodiment, the cranial edge relief 64 is formed at a location that is slightly distal of the suture hole 54 in am implanted position of the bone plate 20. In another embodiment, the cranial edge relief 64 is formed at a location that is between the suture hole 54 and the proximal-most suture hole 56 of the shaft portion 24. However, other placements could also be suitable within the scope of this disclosure.

[0061] A step 66 may be provided at the bone contacting surface 28 of the bone plate 20 within the transition zone 58. The step 66 positions the head portion 22 at an inclined angle y (see Figure 5) relative to the shaft portion 24. The portion of the outer surface 26 provided by the head portion 22 is therefore slightly elevated relative to the portion of the outer surface 26 provided by the shaft portion 24. As further discussed below, the step 66 allows for translation of a tibial bone fragment when performing a medial patellar luxation repair using the bone plate 20.

[0062] The step 66 includes a height H that extends along the Z-axis. The height H may be optimized for accommodating multiple breed sizes and shapes. The height H may be between2024-124-RND-PCT; 67145-811 PCT about 1 .4 mm and about 4.5 mm. However, other heights could be possible within the scope of this disclosure.

[0063] The step 66 may include a curved surface 68 that extends from the cranial side of the bone plate 20 to the caudal side of the bone plate 20. The curved surface 68 may include a curvature that matches the curvature of a surface cut of an osteotomy, such as that made when performing a medial patellar luxation repair, for example. The step 66 therefore provides for maximum plate-to-bone contact after translation of the proximal head fragment subsequent to a tibial plateau leveling osteotomy procedure, thereby achieving improved fixation.

[0064] In the above embodiment, the bone plate 20 is shown and described as having a right orientation that is suitable for medial placement relative to a right tibia 14 (see Figure 10). However, the bone plate 20 could also be provided in a left orientation, with such a bone plate being the mirror image of the right orientated bone plates described above and that is suitable for medial placement relative to a left tibia.

[0065] The bone plate 20 may be provided in multiple sizes for accommodating multiple animals, breeds, and breed sizes. Figure 11 illustrates bone plates of various sizes. For example, bone plate 20-1 may be a size 1.6 bone plate, bone plate 20-2 may be a size 2.0 bone plate, bone plate 20-3 may be a size 2.4 bone plate, bone plate 20-4 may be a size 2.7 bone plate, bone plate 20-5 may be a size 3.0 bone plate, bone plate 20-6 may be a size 3.5 small bone plate, bone plate 20-7 may be a size 3.5 standard bone plate, and bone plate 20-8 may be a size 3.5 broad bone plate. Other sizes could also be provided within the scope of this disclosure.

[0066] Figures 12-17, with continued reference to Figures 1-11, schematically illustrate, in sequential order, an exemplary surgical method for repairing medial patellar of a stifle joint 10 of an animal. Fewer or additional steps than are recited below could be performed within the scope of this disclosure. In addition, the recited order of steps depicted in Figures 12-17 is not intended to limit this disclosure.

[0067] Referring first to Figure 12, the bone plate 20 may be positioned against the tibia 14 such that the head portion 22 is about 1 mm distal to the stifle joint line between the tibia 14 and the femur 12. When properly positioned, the first, second, and third openings 40, 42, and 44 of the head portion 22 of the bone plate are located near the caudo-central part of a proximal section of the tibia 14, and the shaft portion 24 extends distally along the center of the tibia 14.2024-124-RND-PCT; 67145-811 PCT

[0068] The laser line 62 may be used as a visual indicator for marking and / or scoring an osteotomy line 70 that marks the location for creating an osteotomy cut. The step 66 of the bone plate 20 may be aligned to the osteotomy line 70. The respective curvatures of the step 66 and the osteotomy line 70 match one another.

[0069] Referring next to Figure 13, the surgical method may proceed by performing a standard tibial plateau leveling osteotomy (TPLO) with an appropriately sized saw blade 72. The line 70 is used to guide the starling position of the saw blade 72. The saw blade 72 may cut into the proximal tibia 14 to create a curvilinear osteotomy cut 74 that separates a proximal bone fragment 76 from a main portion 78 of the tibia 14.

[0070] Next, as shown in Figures 14 and 15, the bone plate 20 may be positioned relative to the tibia 14 such that the step 66 is aligned to the curvilinear osteotomy cut 74. The bone plate 20 may be stabilized relative to the tibia 14 using one or more fixation devices (e.g., K-wire, BB- tak, etc.). The proximal bone fragment 76 may then be rotated using a rotational pin 80. During use of the rotational pin 80, the proximal bone fragment 76 may be simultaneously rotated crania- caudally (see arrow 82 of Figure 14), translated latero-medially (see arrow 84 of Figure 15), and rotated medially (see arrow 86 of Figure 15) based on the individual limb alignment.

[0071] The rotation and translation provided during the above step is sufficient to reduce the medial patellar luxation, thereby re-seating the patella 16 within the femoral groove 18 (see Figure 16). The proximal bone fragment 76 may then be stabilized and fixed from movement using one or more fixation devices 88 (e.g., K-wires, BB-taks, etc.). At least a portion of the fixation devices 88 may be accommodated within the K-wires holes 50 to provide provisional fixation of the bone plate 20 relative to the tibia 14.

[0072] Referring to Figure 17, a plurality of fixation devices 90 (e.g., locking screws, compression screws, etc.) may be inserted through the openings 40-46 and the compression slot 48 for fixating the bone plate 20 to both the reconfigured proximal bone fragment 76 and the main portion 78 of the tibia 14. The fixation devices 90 may be inserted using known devices and techniques. If desired, the suture hole 54 may be utilized at this juncture for receiving a suture or other threadlike material for restraining rotation of the stifle joint 10. Closure over the bone plate 20 may be achieved using the suture holes 56.

[0073] The bone plates of this disclosure provide a more anatomic, easier to use, and more stable bone plate for repairing medial patellar luxation of animals compared to prior designs and2024-124-RND-PCT; 67145-811 PCT techniques. The proposed bone plates include various design features for specifically accommodating the contour and native tissue anatomy associated with the proximal tibia.

[0074] Although the different non-limiting embodiments are illustrated as having specific components or steps, the embodiments of this disclosure are not limited to those particular combinations. It is possible to use some of the components or features from any of the non-limiting embodiments in combination with features or components from any of the other non-limiting embodiments.

[0075] It should be understood that like reference numerals identify corresponding or similar elements throughout the several drawings. It should further be understood that although a particular component arrangement is disclosed and illustrated in these exemplary embodiments, other arrangements could also benefit from the teachings of this disclosure.

[0076] The foregoing description shall be interpreted as illustrative and not in any limiting sense. A worker of ordinary skill in the art would understand that certain modifications could come within the scope of this disclosure. For these reasons, the following claims should be studied to determine the true scope and content of this disclosure.

Claims

2024-124-RND-PCT; 67145-811 PCTCLAIMSWhat is claimed is:

1. A medial patellar luxation bone plate designed for veterinary use, comprising: a shaft portion; a head portion; a bone contacting surface; an outer surface opposed to the bone contacting surface; and a step provided at the bone contacting surface and configured to position the head portion at an inclined angle relative to the shaft portion, wherein the step includes a curved surface.

2. The medial patellar luxation bone plate as recited in claim 1, wherein the bone contacting surface is contoured to conform to a proximal tibia, and optionally wherein the proximal tibia is a canine proximal tibia.

3. The medial patellar luxation bone plate as recited in claim 1 or 2, comprising a plurality of openings and at least one K-wire hole formed through the head portion.

4. The medial patellar luxation bone plate as recited in claim 3, wherein the plurality of openings includes at least a first opening and a second opening, and further wherein the first opening and the second opening extend through the head portion along different angles.

5. The medial patellar luxation bone plate as recited in claim 4, wherein the plurality of openings includes a third opening, and further wherein the first opening, the second opening, and the third opening extend through the head portion along different angles.

6. The medial patellar luxation bone plate as recited in any preceding claim, comprising a plurality of openings and at least one K-wire hole formed through the shaft portion, and optionally comprising a compression slot formed through the shaft portion at a location that is between a first opening of the plurality of openings and a second opening of the plurality of openings.2024-124-RND-PCT; 67145-811 PCT7. The medial patellar luxation bone plate as recited in any preceding claim, wherein the head portion is bounded by a peripheral edge that connects the head portion to a cranial side and a caudal side of the shaft portion.

8. The medial patellar luxation bone plate as recited in claim 7, wherein the peripheral edge includes a first curved peak on the cranial side, a second curved peak at the caudal side, and a third curved peak between the first curved peak and the second curved peak.

9. The medial patellar luxation bone plate as recited in any preceding claim, wherein the shaft portion and the head portion extend along a longitudinal axis, and further wherein the head portion extends along a centerline axis that is transverse to the longitudinal axis to angle the head portion relative to the shaft portion, and optionally wherein the head portion is angled between about 20 degrees and about 25 degrees relative to the shaft portion.

10. The medial patellar luxation bone plate as recited in any preceding claim, wherein the curved surface extends from a cranial side to a caudal side of the medial patellar luxation bone plate.

11. The medial patellar luxation bone plate as recited in any preceding claim, wherein the curved surface is configured to match a curvature of a curvilinear osteotomy cut.

12. The medial patellar luxation bone plate as recited in any preceding claim, wherein a height of the step is between about 1.4 mm and about 4.5 mm.

13. A surgical method for repairing medial patellar luxation of a stifle joint, comprising: performing a curvilinear osteotomy cut that separates a proximal bone fragment from a main portion of a tibia of the stifle joint; aligning a bone plate to the tibia such that a curved surface of a step of the bone plate aligns to the curvilinear osteotomy cut; simultaneously rotating and translating the proximal bone fragment relative to the main portion of the tibia; and fixating the bone plate to the proximal bone fragment and the main portion of the tibia.2024-124-RND-PCT; 67145-811 PCT14. The surgical method recited in claim 13, wherein simultaneously rotating and translating the proximal bone fragment includes: rotating the proximal bone fragment crania-caudally; translating the proximal bone fragment latero-medially; and optionally: rotating the proximal bone fragment medially.

15. The surgical method as recited in claim 13 or 14, wherein simultaneously rotating and translating the proximal bone fragment reduces the medial patellar luxation, thereby re-seating a patella of the stifle joint within a femoral groove.

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