IMPLANT COMPONENTS AND METHODS
Systems, devices, and methods are provided for orthopedic implants. The implants may include a base member, such as an acetabular shell or an augment, that is configured to couple with an augment, flange cup, mounting member, or any other suitable orthopedic attachment. An augment provided for an acetabular implant may be adjustably positionable around the implant. An implant may have one or more slots that mate with connections on the augment and allow the augment to move within the slot. An augment may be translated, rotated, or moved in any other way to achieve a desired orientation prior to locking the augment in place relative to the implant. The augment may be locked by a screw or other locking mechanism that holds the augment in place. The locking mechanism may be releasable to allow for repositioning of the augment.
1 . An orthopedic implant system comprising:
an acetabular implant having a track that includes a plurality of slots and an exterior surface;
an augment having a protrusion that moves within the plurality of slots, the augment having a first cam surface that forms an interface with the exterior surface; and
wherein the protrusion has an adjustable fastener that, upon adjusting, fixes the augment with respect to the implant to impede further movement.
2 . The orthopedic implant system of claim 1 , wherein the augment rotates about the exterior surface.
3 . The orthopedic implant system of claim 1 , wherein the adjustable fastener is a tightening screw that extends through a through-hole in the augment.
4 . The orthopedic implant system of claim 3 , wherein the tightening screw, upon tightening, expands the protrusion and thereby tightens the augment within the track.
5 . The orthopedic implant system of claim 4 , wherein the protrusion is flared outwardly.
6 . The orthopedic implant system of claim 3 , wherein the tightening screw has a head that fits within a slot and faces an interior portion of the implant.
7 . The orthopedic implant system of claim 6 , wherein the slot has an interior opening that aligns with the head.
8 . The orthopedic implant system of claim 7 , wherein the interior opening receives a tightening rod to tighten the screw.
9 . The orthopedic implant system of claim 1 , wherein the track includes a dovetail joint that receives the protrusion.
10 . The orthopedic implant system of claim 1 , wherein the track includes a straight portion and a curved portion.
11 . The orthopedic implant system of claim 10 , wherein the track includes two straight slots and a curved portion.
12 . The orthopedic implant system of claim 1 , wherein the track includes a J-shaped slot with a wall of the implant.
13 . The orthopedic implant system of claim 1 , wherein the protrusion is part of an intermediate locking member that is integral to the augment.
14 . The orthopedic implant system of claim 1 , wherein the first cam surface of the augment includes at least one trough that receives cement to bind the augment to the shell.
15 . The orthopedic implant system of claim 14 , wherein the augment includes a plurality of projections that form a gap.
16 . The orthopedic implant system of claim 15 , further comprising a flange attached to the augment.
17 . A method of preparing an orthopedic implant, comprising the step of:
providing an implant having a curved external surface and an opening in the surface, the opening having at least two portions that join at a common region but are separated by an angle of less than 180°;
providing an augment having a first surface that interfaces with the curved external surface;
coupling the augment and implant by an intermediate locking member; and
tightening the intermediate locking member.
18 . The method of claim 17 , including the step of securing the augment to the implant by disposing cement within a trough located on the first surface.
19 . The method of claim 17 , further comprising the step of rotating the augment with respect to the implant about the curved external surface prior to tightening the intermediate locking member.
20 . The method of claim 19 , further comprising the step of moving the intermediate locking member within the opening prior to tightening.
21 . The method of claim 17 , further comprising the steps of applying a fastener to the implant, so that the fastener extends outwardly from the external surface, and positioning the augment about the external surface so that the extended fastener fits between two protrusions of the augment.
22 . The method of claim 21 , wherein the intermediate locking member is tightened with respect to the augment by a screw.