Adaptor prosthesis kit
The present disclosure is directed to a kit of prosthetic components having at least two monolithic adaptors. The first adaptor incorporates a first and a second coupling mechanism, where the height of the first coupling mechanism defines the distance between an articulating surface and a fixture. The second monolithic adaptor also includes a third and a fourth coupling mechanism. The height of the third coupling mechanism can also define the distance between the articulating surface and the fixture. The coupling mechanisms, that define the distance between the articulating surface and the fixture, do not have equal heights.
1 . A kit of prosthetic components comprising:
a first adaptor having a first end and a second end, said first end defining a first coupling member having a first coupling surface, said first coupling member extends along a first axis and said second end defines a second coupling member having a second coupling surface, said second coupling member extends along a second axis, wherein said first coupling member has a first height that extends from said first end to said second coupling member; and
a second adaptor having a first end and a second end, said first end defining a third coupling member having a third coupling surface, said first coupling member extends along a third axis and said second end defines a fourth coupling member having a fourth coupling surface, said fourth coupling member extends along a fourth axis, wherein said second adaptor has a second height that extends from said first end to said fourth coupling member; wherein said first height is different from said second height.
2 . The kit according to claim 1 , wherein said first axis is colinear with said second axis.
3 . The kit according to claim 1 , wherein said first coupling member and said third coupling member form male locking tapers.
4 . The kit according to claim 1 , wherein said second coupling member and said fourth coupling member form male locking tapers.
5 . The kit according to claim 1 , wherein said second coupling member has a third height and the fourth coupling member has a fourth height which is greater than said third height and wherein the first height is parallel with the first axis.
6 . The kit according to claim 1 , further comprising a stem, a head, and a glenoid.
7 . The kit according to claim 6 , wherein the head defines an external perimeter, said external perimeter defining a central head axis, said head defining a female coupling taper, said female coupling taper defining a head coupling axis.
8 . The kit according to claim 7 , wherein the head coupling axis is offset from the central head axis.
9 . The kit according to claim 7 , wherein the head comprises an extended articulating surface.
10 . The kit according to claim 9 , wherein the central head axis is configured to be disposed between the head coupling axis and the extended articulating surface.
11 . A kit of prosthetic components comprising:
a first adaptor having a first end and a second end, said first end defining a first coupling member that extends along a first axis and said second end defines a second coupling member that extends along a second axis, wherein said first coupling member has a first length that extends from said first end to said second coupling member;
a second adaptor having a first end and a second end, said first end defining a third coupling member that extends along a third axis and said second end defines a fourth coupling member that extends along a fourth axis, wherein said second adaptor has a second height that extends from said first end to said fourth coupling member; and wherein said first length is different from said second length.
12 . The kit according to claim 11 , wherein said first adaptor and said second adaptor are generally cylindrical.
13 . The kit according to claim 11 , wherein said second coupling member and said fourth coupling member are of equal length.
14 . The kit according to claim 11 , wherein said first adeapter is configured to be coupled to a bone fixation member and wherein the second coupling member is configured to be coupled to an articulating head.
15 . The kit according to claim 11 , further comprising a head configured to mate with one of the first or second adaptor.
16 . The kit according to claim 15 , wherein the head defines an external perimeter, said external perimeter defining a central head axis, said head defining a female coupling taper, said female coupling taper defining a head coupling axis which is offset from the central head axis.
17 . The kit according to claim 11 , wherein said first coupling member and said second coupling member form male Morse tapers.
18 . The kit according to claim 17 , wherein said third and fourth coupling members form a Morse taper.
19 . The kit according to claim 11 , further comprising a stem, a head, a spacer, and a glenoid, each of which are configured to be coupled to the first adaptor.
20 . The kit according to claim 19 , wherein the head comprises an extended articulating surface and wherein the central head axis is disposed between the head coupling axis and the extended articulating surface.
21 . A kit of prosthetic components, comprising:
a first adaptor having a first main body having a first coupling surface and a first coupling mechanism having a second coupling surface, wherein said first adaptor is adapted to be coupled to a head having an articulating surface and adapted to be coupled to a fixation component, the distance between said articulating surface and fixation component is defined by a first distance between said first and second coupling surfaces; and
a second adaptor having a second main body having a third coupling surface and a second coupling mechanism having a fourth coupling surface, wherein the second adaptor is adapted to be coupled to the head and is adapted to be coupled to the fixation component, the distance between said articulating surface and said fixation component is defined by a second distance between said third and fourth coupling surfaces and wherein the first distance is different than the second distance.
22 . The kit according to claim 21 wherein the first main body defines a first axis and the first adaptor defines a second axis.
23 . The kit according to claim 22 , wherein the first axis of said first main body is radially offset from the second axis of said first adaptor.
24 . The kit according to claim 21 , wherein a first axis of said second main body is radially offset from a second axis of said second coupling mechanism.
25 . The kit according to claim 24 , wherein the offset between the first axis and the second axis is between 0 and about 10 millimeters.
26 . The kit according to claim 21 , wherein said fixation component is a humeral stem.
27 . The kit according to claim 21 , further comprising a prosthetic glenoid.
28 . The kit according to claim 21 , further comprising a stem and an articulating head.
29 . A method for reducing likelihood of dislocations in a shoulder joint comprising:
coupling a humeral fixation member to a humerus;
determining a proper size for an articulating head to be coupled to the fixation member;
determining the proper medial displacement of the head from the fixation member;
determining a proper superior displacement of the head with respect to the humeral fixation; and
disposing an adaptor between the head and the fixation member to provide the medial and superior displacement.
30 . The method according to claim 29 , further comprising providing an extended articulating bearing surface on the head at a location superior to the adaptor.
31 . The method according to claim 29 , wherein determining the proper superior displacement is determining the proper superior displacement sufficient to provide a predetermined amount of tension on a deltoid muscle.