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Publication Number
US-12453637-B2
Publication Date
2025-10-28
Expiration Date
Abstract
This disclosure relates to orthopaedic implant systems and methods for restoring functionality to a joint. The implant systems disclosed herein include offset arrangements that may facilitate conversion of the implant system during a subsequent surgical procedure.
Core Innovation
The invention relates to a convertible orthopaedic implant system and an implant for a shoulder replacement that includes a circular baseplate configured to be embedded in or on a glenoid and an oblong pad configured to interface with a humerus or a humeral implant. The oblong pad extends superiorly beyond the baseplate relative to a superior-inferior direction of the glenoid, and at least 25% of a pad area of the pad and/or a length of the pad extends superior to the baseplate.
A central aspect of the invention is the pad-to-baseplate geometry using a first centroid associated with a perimeter of the plate body projected onto a reference plane and a second centroid associated with a perimeter of the pad body projected onto the reference plane. The pad body is dimensioned such that the second centroid is offset by a first distance from the first centroid relative to a lengthwise direction, producing a superiorly offset configuration relative to the superior-inferior direction of the glenoid, with an offset ratio, area ratio, and width ratio constraints between the pad body and the plate body.
The system is convertible between anatomical and reverse configurations while sharing components, including a common baseplate, by releasably securable couplings between the baseplate and the pad and, in further configurations, between the baseplate and a glenosphere. The releasable couplings include Morse taper connections, and anti-rotation features include apertures with pegs received to limit relative rotation between components. The reverse configuration secures a generally convex articulating glenosphere to the baseplate, optionally using a spacer to provide lateral and/or angular offset.
Methods include installing a convertible orthopaedic implant system by positioning and securing a circular baseplate to a glenoid, releasably securing an oblong pad, and establishing the specified superior offsets using center of mass relationships between a first center of mass of the plate body and a second center of mass of the pad body. The conversion sequence further includes removing the oblong pad from the circular baseplate at a first position relative to the glenoid and securing a glenosphere to the baseplate in situ, where the glenosphere includes an articulating surface having a generally convex geometry dimensioned to interface with a humeral implant.
Claims Coverage
The independent claims cover four inventive features: a shoulder replacement implant with a superiorly extending oblong pad, a convertible orthopaedic implant system with centroid-based geometry constraints, and two installing methods for securing the pad and for replacing it with a glenosphere. Across the independent claims, the geometry is anchored by superior-inferior centroid and center-of-mass offset constraints, including numeric thresholds and ratio relationships.
Superior extension of an oblong pad relative to a circular baseplate
A shoulder replacement implant including a circular baseplate configured to be embedded in or on a glenoid and an oblong pad configured to interface with a humerus or a humeral implant, where the pad extends superiorly beyond the baseplate and at least 25% of a pad area and/or a length of the pad extends superior to the baseplate relative to the superior-inferior direction.
Convertible pad-to-baseplate geometry using centroid offset and area/width ratio constraints
A convertible orthopaedic implant system including a baseplate and a pad releasably securable adjacent a bone contacting face, wherein the plate body perimeter is substantially circular, the pad body perimeter is oblong, the second centroid is offset from the first centroid relative to the lengthwise direction, the offset ratio is at least 1:4, the area ratio is greater than or equal to 1.5:1, and/or the ratio of maximum width of the plate body to minimum width of the pad body is equal to or greater than 0.5:1.
Installing a convertible system by securing a superior-offset oblong pad and defining center-of-mass offset constraints
A method of installing a convertible orthopaedic implant system comprising positioning a circular baseplate relative to a glenoid face and releasably securing an oblong pad, wherein the second center of mass is superiorly offset from the first center of mass and at least 25% of a pad area and at least 25% of the first length of the pad body are superiorly offset from the first center of mass.
Installing by removing an oblong pad and securing a generally convex glenosphere
A method of installing a convertible orthopaedic implant system comprising removing an oblong pad from a circular baseplate at a first position relative to a glenoid and securing a glenosphere to the baseplate in situ, wherein the glenosphere includes an articulating surface having a generally convex geometry dimensioned to interface with a humeral implant.
The inventive theme is a convertible shoulder implant system that uses an oblong pad with superior-inferior extension and defined centroid or center-of-mass offsets relative to a circular baseplate, together with releasably securable couplings to enable conversion to a glenosphere configuration.
Stated Advantages
Documented Applications
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