Shoulder prosthesis with humeral fracture stem
View Patent ↗Various embodiments of the present invention are directed to a shoulder prosthesis. These embodiments may relate to a shoulder prosthesis including, for example, a humeral stem for fracture indication. Of note, certain embodiments of the present invention provide a humeral prosthesis with improved integration of the tuberosities around the humeral stem. Various methods relating to uses and applications of the prosthesis are also disclosed.
1. A shoulder prosthesis for implantation in a patient, comprising:
a shaft portion for attachment to a humerus shaft of the patient, wherein the shaft portion includes a proximal end and a distal end;
a metaphyseal portion, wherein the metaphyseal portion includes a body, a proximal end and a distal end;
a fin including first and second opposed surfaces, wherein the fin extends from the body of the metaphyseal portion; and
a flange portion;
wherein the distal end of the metaphyseal portion abuts the proximal end of the shaft portion and the proximal end of the metaphyseal portion abuts the flange portion;
wherein the metaphyseal portion includes a first concavity having a surface for receiving at least a part of a greater tuberosity of the patient and a second concavity having a surface for receiving at least a part of a lesser tuberosity of the patient;
wherein the first concavity is defined at least in part by at least a portion of the first opposed surface of the fin element extending from the body of the metaphyseal portion;
wherein the second concavity is defined at least in part by at least a portion of the second opposed surface of the fin element extending from the body of the metaphyseal portion;
wherein the first concavity and the second concavity are asymmetric;
wherein the fin extends from the body of the metaphyseal portion in a generally anterior-lateral direction;
wherein a free edge of the fin is offset in an anterior direction from a frontal plane of the prosthesis; and
wherein a position of the free edge of the fin substantially mimics a position of essentially an entire anatomical location of a bicipital groove.
2. The shoulder prosthesis of claim 1 , wherein the position of the free edge of the fin substantially mimics the position of essentially the entire anatomical location of the bicipital groove along a centerline of the bicipital groove.
3. The shoulder prosthesis of claim 2 , wherein an offset distance of a point on the free edge of the fin from a sagital plane of the prosthesis varies with the vertical location of the point on the free edge of the fin.
4. The shoulder prosthesis of claim 1 , wherein a thickness of the fin decreases as a function of distance from the body of the metaphyseal portion.
5. The shoulder prosthesis of claim 1 , wherein the fin defines a first tuberosity receiving portion configured to receive essentially the entire greater tuberosity and a second tuberosity receiving portion configured to receive essentially the entire lesser tuberosity.
6. The shoulder prosthesis of claim 5 , wherein the first tuberosity receiving portion is configured to receive essentially the entire greater tuberosity without removal of substantial bone mass therefrom and the second tuberosity receiving portion is configured to receive essentially the entire lesser tuberosity without removal of substantial bone mass therefrom.
7. The shoulder prosthesis of claim 5 , wherein the first tuberosity receiving portion is configured to receive essentially the entire greater tuberosity without substantially changing the shape thereof and the second tuberosity receiving portion is configured to receive essentially the entire lesser tuberosity without substantially changing the shape thereof.
8. The shoulder prosthesis of claim 5 , wherein the first tuberosity receiving portion has an elongated shape and the second tuberosity receiving portion has an elongated shape.
9. The shoulder prosthesis of claim 1 , further comprising a prosthetic humeral head.
10. The shoulder prosthesis of claim 9 , wherein the prosthetic humeral head is attached to the flange portion.
11. The shoulder prosthesis of claim 10 , wherein the prosthetic humeral head is attached to the flange portion via a Morse Taper.
12. The shoulder prosthesis of claim 11 , wherein the Morse Taper is offset from center in a posterior direction.
13. The shoulder prosthesis of claim 1 , wherein the flange includes at least one hole for receiving a suture.
14. The shoulder prosthesis of claim 1 , wherein the shaft portion is adapted to be anchored in a medullary canal of the humerus shaft.
15. The shoulder prosthesis of claim 14 , wherein the shaft portion includes at least one groove for gripping the medullary canal of the humerus shaft.
16. The shoulder prosthesis of claim 1 , wherein the fin has at least one aperture therethrough.
17. The shoulder prosthesis of claim 16 , wherein the aperture is selected from the group including: (a) a suture hole for receiving a suture; and (b) a window through which osseous fusion may occur.
18. A shoulder prosthesis for implantation in a patient, comprising:
a shaft portion for attachment to a humerus shaft of the patient, wherein the shaft portion includes a proximal end and a distal end;
a metaphyseal portion, wherein the metaphyseal portion includes a body, a proximal end and a distal end;
a fin including first and second opposed surfaces, wherein the fin extends from the body of the metaphyseal portion; and
a flange portion;
wherein the distal end of the metaphyseal portion abuts the proximal end of the shaft portion and the proximal end of the metaphyseal portion abuts the flange portion;
wherein the metaphyseal portion includes a first concavity having a surface for receiving at least a part of a greater tuberosity of the patient and a second concavity having a surface for receiving at least a part of a lesser tuberosity of the patient;
wherein the first concavity is defined at least in part by at least a portion of the first opposed surface of the fin element extending from the body of the metaphyseal portion;
wherein the second concavity is defined at least in part by at least a portion of the second opposed surface of the fin element extending from the body of the metaphyseal portion;
wherein the first concavity and the second concavity are asymmetric; and
wherein a position of a free edge of the fin substantially mimics a position of essentially an entire three-dimensional anatomical location of a bicipital groove.
19. The shoulder prosthesis of claim 18 , wherein the free edge of the fin substantially mimics the position of essentially the entire three-dimensional anatomical location of the bicipital groove along a centerline of the bicipital groove.
20. The shoulder prosthesis of claim 19 , wherein an offset distance of a point on the free edge of the fin from a centerline of the shaft portion varies with the vertical location of the point on the free edge of the fin.
21. The shoulder prosthesis of claim 18 , wherein a thickness of the fin decreases as a function of distance from the body of the metaphyseal portion.
22. The shoulder prosthesis of claim 18 , wherein the fin defines a first tuberosity receiving portion configured to receive essentially the entire greater tuberosity and a second tuberosity receiving portion configured to receive essentially the entire lesser tuberosity.
23. The shoulder prosthesis of claim 22 , wherein the first tuberosity receiving portion is configured to receive essentially the entire greater tuberosity without removal of substantial bone mass therefrom and the second tuberosity receiving portion is configured to receive essentially the entire lesser tuberosity without removal of substantial bone mass therefrom.
24. The shoulder prosthesis of claim 22 , wherein the first tuberosity receiving portion is configured to receive essentially the entire greater tuberosity without substantially changing the shape thereof and the second tuberosity receiving portion is configured to receive essentially the entire lesser tuberosity without substantially changing the shape thereof.
25. The shoulder prosthesis of claim 22 , wherein the first tuberosity receiving portion has an elongated shape and the second tuberosity receiving portion has an elongated shape.
26. The shoulder prosthesis of claim 18 , further comprising a prosthetic humeral head.
27. The shoulder prosthesis of claim 26 , wherein the prosthetic humeral head is attached to the flange portion.
28. The shoulder prosthesis of claim 27 , wherein the prosthetic humeral head is attached to the flange portion via a Morse Taper.
29. The shoulder prosthesis of claim 28 , wherein the Morse Taper is offset from center in a posterior direction.
30. The shoulder prosthesis of claim 18 , wherein the flange includes at least one hole for receiving a suture.
31. The shoulder prosthesis of claim 18 , wherein the shaft portion is adapted to be anchored in a medullary canal of the humerus shaft.
32. The shoulder prosthesis of claim 31 , wherein the shaft portion includes at least one groove for gripping the medullary canal of the humerus shaft.
33. The shoulder prosthesis of claim 18 , wherein the fin has at least one aperture therethrough.
34. The shoulder prosthesis of claim 33 , wherein the aperture is selected from the group including: (a) a suture hole for receiving a suture; and (b) a window through which osseous fusion may occur.