Tibial plateau leveling osteotomy plate

A bone plate dimensioned for securing two tibial bone segments of a quadrupedal animal as part of a tibial leveling osteotomy procedure, the bone plate comprising:

• a distal portion comprising an elongated segment configured for attachment to a shaft of a tibia, the distal portion including a plurality of distal portion screw holes extending therethrough, each distal portion screw hole being configured to accept a screw therethrough to secure the distal portion to the shaft of the tibia and defining a base plane including a bone contacting surface of the distal portion and a mid-plane bisecting the distal portion perpendicular to the base plane;
• a proximal portion configured for attachment to a cut-away and repositioned portion of the tibia, the cut-away portion of the tibia comprising an articular surface at which the tibia interacts with a femur, the proximal portion having a bone-contacting surface configured and dimensioned to conform to the cut-away portion of the tibia when the distal portion is coupled to the shaft of the tibia in a desired orientation and when the cut-away portion of the tibia has been re-positioned as desired, at least a portion of the bone-contacting surface of the proximal portion being concave and having a curvature extending about a centerline extending in a centerline plane including a first rotation axis defined by an intersection of the mid-plane with a transverse plane transverse to the midplane and the base plane, the centerline plane being rotated relative to the mid-plane about the first rotation axis by a first angle, the centerline plane being rotated by a second angle relative to a second rotation axis defined by an intersection of the transverse plane and the base plane;
• and
• three proximal portion locking screw holes located in the proximal portion and extending through the bone-contacting surface, at least two of the proximal portion locking screw holes being configured, when the bone plate is positioned on the tibia in a desired position, to lock bone screws inserted therethrough along screw axes selected to pass into the resected portion of bone without intersecting the articular surface.

A bone plate for securing two tibial bone segments as part of a tibial leveling osteotomy procedure for an animal, the bone plate comprising:

• a distal portion comprising an elongated shaft having disposed therein a plurality of distal portion screw holes each designed to accept a screw;
• and
• a proximal portion configured for attachment to a cut-away and repositioned portion of the tibia, the cut-away portion of the tibia comprising an articular surface at which the tibia interacts with a femur, the proximal portion having a bone-contacting surface configured and dimensioned to conform to the cut-away portion of the tibia when the distal portion is coupled to the shaft of the tibia in a desired orientation and when the cut-away portion of the tibia has been re-positioned as desired, the proximal portion comprising at least three proximal portion screw holes each designed to accept a screw, wherein a first proximal portion screw hole is a superior screw hole, a second proximal portion screw hole is a cranial screw hole located distally and cranially from the superior screw hole, and a third proximal portion screw hole is a caudal screw hole located distally and caudally from the superior screw hole, wherein screw hole paths for at least two of the three screw holes of the proximal portion are predetermined and angled to direct screws inserted therethrough, when the bone plate is positioned on the tibia in a desired position, into a central mass of the tibia.

A bone plate dimensioned for securing two tibial bone segments of an animal as part of a tibial leveling osteotomy procedure, the bone plate comprising:

• a distal portion comprising an elongated segment configured for attachment to a shaft of a tibia, the distal portion having a plurality of distal portion screw holes each designed to accept a screw to secure the distal portion to the shaft of the tibia and defining a base plane including a bone contacting surface of the distal portion and a mid-plane bisecting the distal portion perpendicular to the base plane;
• a proximal portion configured for attachment to a cut-away proximal portion of the tibia, the resected portion comprising an articular surface at which the tibia interacts with a femur, the proximal portion having a bone-contacting surface pre-contoured and dimensioned to conform to the cut-away portion of the tibia when the elongated segment is coupled to the shaft of the tibia in a desired orientation and the cut-away proximal portion of the tibia has been rotated into a desired position, the bone contacting surface of the proximal portion being partially defined by a concave surface a curvature of which extends about a centerline lying in a centerline plane including a first rotation axis defined by an intersection of the mid-plane with a transverse plane transverse to the midplane and the base plane, the centerline plane being rotated relative to the mid-plane about the first rotation axis by a first angle, and wherein the centerline plane is rotated by a second angle relative to a second rotation axis defined by an intersection of the transverse plane and the base plane;
• and
• a plurality of proximal portion locking screw holes located in the proximal portion extending through the bone-contacting surface, the proximal portion locking screw holes being configured, when the bone plate is positioned on the tibia in a desired position, to lock bone screws inserted therethrough along screw axes selected to pass into the resected portion of bone without intersecting the articular surface.

A kit for securing two tibial bone segments to one another as part of a tibial leveling osteotomy procedure for an animal, the kit comprising:

• a bone plate including a distal portion comprising an elongated segment configured for attachment to a shaft of a tibia and a plurality of distal portion screw holes extending therethrough, each distal portion screw hole being configured to accept a screw to secure the distal portion to the shaft of the tibia and defining a base plane including a bone contacting surface of the distal portion and a mid-plane bisecting the distal portion perpendicular to the base plane, the bone plate further comprising a proximal portion configured for attachment to a cut-away and repositioned portion of the tibia, the cut-away portion of the tibia comprising an articular surface at which the tibia interacts with a femur, the proximal portion having a bone-contacting surface configured and dimensioned to conform to the cut-away portion of the tibia when the distal portion is coupled to the shaft of the tibia in a desired orientation and when the cut-away portion of the tibia has been re-positioned as desired, at least a portion of the bone-contacting surface of the proximal portion being concave and having a curvature extending about a centerline extending in a centerline plane including a first rotation axis defined by an intersection of the mid-plane with a transverse plane transverse to the midplane and the base plane, the centerline plane being rotated relative to the mid-plane about the first rotation axis by a first angle, the centerline plane being rotated by a second angle relative to a second rotation axis defined by an intersection of the transverse plane and the base plane, the proximal portion including three proximal portion locking screw holes;
• and
• a plurality of locking bone screws configured, when the bone plate is positioned on the tibia in a desired position, to be locked into first and second ones of the proximal portion locking screw holes along screw paths selected to pass into the resected portion of bone without intersecting the articular surface, away from an osteotomy surface of the tibia.

A kit for securing two tibial bone segments to one another as part of a tibial leveling osteotomy procedure for an animal, the kit comprising:

• a bone plate including a distal portion comprising an elongated shaft having a plurality of distal portion screw holes each designed to accept a screw and a proximal portion configured for attachment to a cut-away and repositioned portion of the tibia, the cut-away portion of the tibia comprising an articular surface at which the tibia interacts with a femur, the proximal portion having a bone-contacting surface configured and dimensioned to conform to the cut-away portion of the tibia when the distal portion is coupled to the shaft of the tibia in a desired orientation and when the cut-away portion of the tibia has been re-positioned as desired, the proximal portion comprising at least three proximal portion screw holes each designed to accept a screw, wherein a first one of the proximal portion screw holes is a superior screw hole, a second one of the proximal portion screw holes is a cranial screw hole located distally and cranially from the superior screw hole, and a third one of the proximal portion screw holes is a caudal screw hole located distally and caudally from the superior screw hole;
• and
• a plurality of locking bone screws configured, when the bone plate is positioned on the tibia in a desired position, to be locked into first and second ones of the proximal portion screw holes along screw paths selected to pass into the resected portion of bone without intersecting the articular surface, away from an osteotomy surface of the tibia.