Metatarsal arthroplasty devices, systems, and methods
Implants, systems, instruments, methods, and kits for metatarsophalangeal joint arthroplasty may include metatarsal arthroplasty implants, repositioning guides, broach tools, inserter tools, and sterilizable packaging configured to facilitate metatarsal arthroplasty surgical procedures. The metatarsal arthroplasty implants may generally include an articular member having a convex articular surface, a concave bone-facing surface opposite the convex articular surface, and at least one side surface intermediate the convex articular surface and the concave bone-facing surface, as well as a central shaft sized for insertion into a metatarsal bone having a central shaft longitudinal axis, a central shaft proximal end coupled to the concave bone-facing surface of the articular member, and a central shaft distal end extending away from the concave bone-facing surface of the articular member along the central shaft longitudinal axis.
1 . A system for performing a metatarsal arthroplasty surgical procedure comprising a repositioning guide configured to guide placement of a metatarsal arthroplasty implant on a metatarsal bone, the system comprising:
a metatarsal arthroplasty implant comprising:
an articular member comprising:
a convex articular surface;
a concave bone-facing surface opposite the convex articular surface; and
at least one side surface intermediate the convex articular surface and the concave bone-facing surface; and
a central shaft sized for insertion into the metatarsal bone comprising:
a central shaft longitudinal axis;
a central shaft proximal end coupled to the concave bone-facing surface of the articular member; and
a central shaft distal end extending away from the concave bone-facing surface of the articular member along the central shaft longitudinal axis; and
a repositioning guide comprising:
a repositioning guide body comprising:
a first guide pin hole configured to receive a first guide pin placed in the metatarsal bone at a first location and a first angle; and
a second guide pin hole configured to receive one of:
a second guide pin placed through the second guide pin hole and into the metatarsal bone at a second location and a second angle to guide placement of the metatarsal arthroplasty implant on the metatarsal bone with respect to the second location and the second angle; and
the first guide pin repositioned through the second guide pin hole and into the metatarsal bone at a third location and a third angle to guide placement of the metatarsal arthroplasty implant on the metatarsal bone with respect to the third location and the third angle.
2 . The system of claim 1 , wherein:
the repositioning guide body comprises an offset guide portion comprising an offset concave surface configured to abut the metatarsal bone;
the first guide pin hole comprises a central guide pin hole; and
the second guide pin hole comprises one or more peripheral holes arranged about the central guide pin hole.
3 . The system of claim 2 , wherein the one or more peripheral holes comprise four peripheral holes arranged about the central guide pin hole and configured to guide the second guide pin into the metatarsal bone at the second location and the second angle, parallel to the first guide pin.
4 . The system of claim 1 , wherein:
the repositioning guide body comprises an angular guide portion comprising an angular concave surface configured to abut the metatarsal bone;
the second guide pin hole comprises an attachment guide pin hole spaced apart from the first guide pin hole and configured to guide the second guide pin into the metatarsal bone at the second location and the second angle to secure the angular guide portion to the metatarsal bone; and
the first guide pin hole comprises an angular guide pin hole having an oval shape that is configured to guide repositioning of the first guide pin through the angular guide pin hole and into the metatarsal bone at the third location and the third angle, non-parallel to an initial placement of the first guide pin in the metatarsal bone at the first location and the first angle.
5 . The system of claim 4 , wherein the angular guide portion further comprises one or more angle markings configured to indicate a relative change in angular position between the first angle and the third angle.
6 . The system of claim 1 , wherein the repositioning guide body comprises:
an offset guide portion; and
an angular guide portion,
wherein the offset guide portion and the angular guide portion are coupled to each other via one or more connecting arms intermediate the offset guide portion and the angular guide portion.
7 . A system for performing a metatarsal arthroplasty surgical procedure comprising a repositioning guide configured to guide placement of a metatarsal arthroplasty implant on a metatarsal bone, the system comprising:
a metatarsal arthroplasty implant comprising:
an articular member comprising:
a convex articular surface;
a concave bone-facing surface opposite the convex articular surface; and
at least one side surface intermediate the convex articular surface and the concave bone-facing surface; and
a central shaft sized for insertion into the metatarsal bone comprising:
a central shaft longitudinal axis;
a central shaft proximal end coupled to the concave bone-facing surface of the articular member; and
a central shaft distal end extending away from the concave bone-facing surface of the articular member along the central shaft longitudinal axis; and
a repositioning guide comprising:
a repositioning guide body comprising:
a first guide pin hole configured to receive a first guide pin placed in the metatarsal bone at a first location and a first angle,
wherein the first guide pin hole is elongated to permit adjustment of at least one of:
a sagittal orientation of the first guide pin in the metatarsal bone with respect to the first location and the first angle; and
a lateral orientation of the first guide pin in the metatarsal bone with respect to the first location and the first angle.
8 . The system of claim 7 , wherein the first guide pin hole comprises an angular guide pin hole having an oval shape configured to guide repositioning of the first guide pin through the angular guide pin hole and into the metatarsal bone to adjust the sagittal orientation of the first guide pin in the metatarsal bone at a second angle, non-parallel to the first angle.
9 . The system of claim 7 , wherein the repositioning guide body further comprises:
an attachment guide pin hole spaced apart from the first guide pin hole and configured to guide a second guide pin into the metatarsal bone at a second location and a second angle, parallel to the first angle, to secure the repositioning guide body to the metatarsal bone.
10 . The system of claim 9 wherein, with the first guide pin removed from the first guide pin hole, the repositioning guide body is rotatable about the second guide pin to adjust the medial-lateral orientation of the first guide pin repositioned through the first guide pin hole and into the metatarsal bone at a third location and a third angle.
11 . The system of claim 10 , wherein the third angle is parallel to the first angle.
12 . The system of claim 10 , wherein the third angle is non-parallel to the first angle.
13 . A system for performing a metatarsal arthroplasty surgical procedure comprising a repositioning guide configured to guide placement of a metatarsal arthroplasty implant on a metatarsal bone, the repositioning guide comprising:
a repositioning guide body comprising:
an offset guide portion comprising:
a first guide pin hole configured to receive a first guide pin placed in the metatarsal bone at a first location and a first angle; and
a first plurality of guide pin holes configured to guide repositioning of the first guide pin at a second location and a second angle that is parallel to the first angle; and
an angular guide portion comprising:
one or more guide pin holes configured to receive the first guide pin placed in the metatarsal bone at the first location and the first angle and guide repositioning of the first guide pin to a third location and a third angle non-parallel to the first angle.
14 . The system of claim 13 , wherein the metatarsal arthroplasty implant comprises:
an articular member comprising:
a convex articular surface;
a concave bone-facing surface opposite the convex articular surface; and
at least one side surface intermediate the convex articular surface and the concave bone-facing surface; and
a central shaft sized for insertion into the metatarsal bone comprising:
a central shaft longitudinal axis;
a central shaft proximal end coupled to the concave bone-facing surface of the articular member; and
a central shaft distal end extending away from the concave bone-facing surface of the articular member along the central shaft longitudinal axis.
15 . The system of claim 13 , wherein:
the offset guide portion comprises an offset concave surface configured to abut the metatarsal bone;
the first guide pin hole comprises a central guide pin hole configured to receive the first guide pin placed in the metatarsal bone at the first location and the first angle; and
the first plurality of guide pin holes are arranged about the central guide pin hole and configured to guide repositioning of the first guide pin at the second location and the second angle that is parallel to the first angle.
16 . The system of claim 13 , wherein:
the angular guide portion comprises an angular concave surface configured to abut the metatarsal bone; and
the one or more guide pin holes comprises an angular guide pin hole having an oval shape that is configured to receive the first guide pin placed in the metatarsal bone at the first location and the first angle and guide repositioning of the first guide pin to the third location and the third angle non-parallel to the first angle.
17 . The system of claim 16 , wherein the angular guide portion further comprises one or more angle markings configured to indicate a relative change in angular position between the third angle non-parallel to the first angle.
18 . The system of claim 13 , wherein the offset guide portion and the angular guide portion are coupled to each other via one or more connecting arms intermediate the offset guide portion and the angular guide portion.