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An example of a fastener system is a rod or shaft having external threads and an opening or bore within another structure having corresponding internal threads configured to engage the external threads of the rod or shaft. In certain embodiments, the term fastener may be used with an adjective that identifies an object or structure that the fastener may be particularly configured, designed, or engineered to engage, connect to, join, contact, or couple together with one or more other structures of the same or different types. For example, a "bone fastener" may refer to an apparatus for joining or connecting one or more bones, one or more bone portions, soft tissue and a bone or bone portion, hard tissue and a bone or bone portion, an apparatus and a bone or portion of bone, or the like. |
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FIG. 1 illustrates one exemplary embodiment of an implant system 100 that can be used with one or more joints of the foot. The foot includes a number of joints and a number of bones, not all of the bones and joints are described herein to provide clarity for the present disclosure. FIG. 1 illustrates a few of the bones and joints where an implant system 100 can be deployed. FIG. 1 illustrates a number of bones of a foot including a first metatarsal 110, other metatarsal bones 120, a first proximal phalanx 130, other proximal phalanges 140, intermediate phalanges 150, a first distal phalanx 160, and other distal phalanges 170. |
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In certain embodiments, the implant 500 may include a connector 530. "Connector" refers to any structure configured, engineered, designed, adapted, and/or arranged to connect one structure, component, element, or apparatus to another structure, component, element, or apparatus. A connector can be rigid, pliable, elastic, flexible, and/or semiflexible. Examples of a connector include but are not limited any fastener. As used herein, a "fastener" or "fastener system" refers to any structure configured, designed, or engineered to join two structures. Fasteners may be made of a variety of materials including metal, plastic, composite materials, metal alloys, plastic composites, and the like. |
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The edge 520 is a structure between the joint-facing articular surface 512 and the posterior surface 514. As used herein, “edge” refers to a structure, boundary, or line where an object, surface, or area begins or ends. An edge can also refer to a boundary or perimeter between two structures, objects, or surfaces. An edge can also refer to a narrow part adjacent to a border. (search "edge" on Merriam-Webster.com. Merriam-Webster, 2021. Web. 03 Aug. 2021. Modified.) In certain embodiments, an edge can be a one dimensional or a two dimensional structure that joins two adjacent structures or surfaces. Furthermore, an edge may be at a perimeter of an object or within a perimeter or boundary of an object. In the illustrated embodiment, the edge 520 may have a circular cross-section. |
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In one embodiment, the posterior surface 514 is shaped to engage with a distal articular surface (e.g., natural articular surface 260) of a bone. The posterior surface 514 may be shaped to engage with the distal articular surface by way of a bone pocket formed within the distal articular surface. In one example, the bone pocket may be concave shaped and the posterior surface 514 may be convex shaped to match or substantially match the concave shape of the bone pocket. A concave bone pocket and convex posterior surface 514 can enable the body 510 to seat within the bone pocket when deployed. |
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The joint-facing articular surface 512 can have a variety of shapes and configurations. In one embodiment, the joint-facing articular surface 512 may be generally flat. In another embodiment, the joint-facing articular surface 512 may have a contour configured to facilitate articulation with a natural articular surface 270 of an adjacent bone. |
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The body 510 may resemble a button or plug. In one embodiment, the body 510 has a circular cross section. The body 510 may include a joint-facing articular surface 512 and a posterior surface 514. The joint-facing articular surface 512 is a part of the implant 500 that generally faces the joint. The joint-facing articular surface 512 may be convex and meet the posterior surface 514 at the edge 520. The convex shape of the joint-facing articular surface 512 may be configured to simulate or emulate the shape and contour of a natural articular surface 260 of a joint. Furthermore, the convex shape may distribute loading during use of the joint from an apex 516 of the joint-facing articular surface 512 down and out towards the edge 520. |
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In the illustrated embodiment, the implant 500 is a solid structure that includes a body 510 and an edge 520. As used herein, a "body" refers to a main or central part of a structure. The body may serve as a structural component to connect, interconnect, surround, enclose, and/or protect one or more other structural components. A body may be made from a variety of materials including, but not limited to, metal, plastic, ceramic, wood, fiberglass, acrylic, carbon, biocompatible materials, biodegradable materials or the like. A body may be formed of any biocompatible materials, including but not limited to biocompatible metals such as Titanium, Titanium alloys, stainless steel alloys, cobalt-chromium steel alloys, nickel-titanium alloys, shape memory alloys such as Nitinol, biocompatible ceramics, and biocompatible polymers such as Polyether ether ketone (PEEK) or a polylactide polymer (e.g. PLLA) and/or others. In one embodiment, a body may include a housing or frame or framework for a larger system, component, structure, or device. A body may include a modifier that identifies a particular function, location, orientation, operation, and/or a particular structure relating to the body. Examples of such modifiers applied to a body, include, but are not limited to, "inferior body," "superior body," "lateral body," "medial body," and the like. |
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FIGS. 5A-5D is a perspective view, bottom view, perspective side view, and top view, respectively of an implant 500 according to one embodiment. The embodiment of these figures is but one example of a variety of different implants and/or implant configurations that can be used with the present disclosure. |
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For example, a surgeon may select a size of implant 310 with a diameter D3 (the diameter of the joint-facing articular surface 312) that is smaller than the diameter D2 of the natural articular surface 260 of the bone and greater than a diameter D1, or width, of the OCL 350. The diameter D3 of the implant 310 may maintain a 1-2mm gap between the joint-facing articular surface 312 and an edge of the natural articular surface 260. The system 300, when deployed, results in minimal bone removal. Retaining bone on the natural articular surface 260 can promote mobility and use of the joint and provide options for future treatments of the joint, such as in a revision, for example, if a condition reemerges or gets worse over time. |
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Advantageously, the OCL 350 may have a diameter D1 that is smaller than a diameter D2 of the natural articular surface 260. In certain embodiments, the system 300 can be used to treat the OCL 350 such that a minimal amount of bone and/or soft tissue of the natural articular surface 260 is removed for the procedure. |
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Implementations may include one or more of the following features. The articular implant system may include: a tether that may include a distal end and a proximal end, the distal end configured to connect the tether to the implant; an anchor configured to secure the proximal end of the tether to the metatarsal away from the bone pocket; and where the anchor and tether adjunctively secure the implant to the metatarsal. The implant may include: a distal body that may include the convex distal surface; a proximal body that may include the semispherical proximal surface; and a fastener configured to couple the distal body to the proximal body. |
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FIG. 5D is a top view of the implant of FIG. 5A according to one embodiment. |
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FIG. 5C is perspective side view of the implant of FIG. 5A according to one embodiment. |
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FIG. 5B is bottom view of the implant of FIG. 5A according to one embodiment. |
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FIG. 5A is a perspective view of an implant according to one embodiment. |
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FIG. 4 is an anterior view of a natural articular surface of a bone. |
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FIG. 3 is a perspective side view of the system of FIG. 2 deployed on a foot joint according to one embodiment. |
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FIG. 2 is a perspective view of a system for use on a foot joint according to one embodiment. |
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FIG. 1 is a perspective view of foot joint illustrating an implant system according to one embodiment. |
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