Stem for use in joint arthroplasty
AssigneeShoulder Innovations, Inc.
InventorsMichael D. Ries, Desmond O'Farrell, Andrew John Rodenhouse, Stephen B. Gunther
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Abstract
The invention relates to a prosthesis for implantation into a long bone during joint arthroplasty, particularly Total Shoulder Arthoplasty and Total Hip Arthroplasty, and a method for use of the implant.
Claims19
An implant for use in a long bone during joint arthroplasty, said implant comprising:
- a first end;
- a second end comprising a blunt tip;
- and
- a stem of the implant disposed between the first and second ends, wherein
- a proximal portion of the stem comprises an anterior surface, a posterior surface, a medial surface and a lateral surface, wherein a dimension of said medial surface taken in a first plane substantially perpendicular to the longitudinal axis of the implant is greater than a dimension of said lateral surface taken in the same first plane, and
- a distal portion of the stem comprises an anterior surface, a posterior surface, a medial surface, and a lateral surface, wherein a dimension of said lateral surface taken in a second plane substantially perpendicular to the longitudinal axis of the implant, the second plane spaced distally apart from the first plane is greater than a dimension of the medial surface taken in the same second plane.
An implant for use in a long bone during joint arthroplasty, said implant comprising:
- a first end;
- a second end comprising a blunt distal tip;
- and
- a stem disposed between the first and second ends, said stem comprising an anterior surface, a posterior surface, a medial surface having a transverse dimension, and a lateral surface having a transverse dimension, the stem having a first medial:lateral dimension ratio defined by the transverse dimension of the medial surface taken in a first plane with respect to the transverse dimension of the lateral surface taken in the first plane, the stem also having a second medial:lateral dimension ratio defined by the transverse dimension of the medial surface taken in a second plane with respect to the transverse dimension of the lateral surface taken in the second plane,
- wherein the first plane is substantially transverse to a longitudinal axis of the implant, the first plane being near the first end of the implant and wherein the second plane is substantially transverse to the longitudinal axis of the implant, the second plane being near the second end of the implant,
- wherein the second medial:lateral dimension ratio is different than the first medial:lateral dimension ratio.
A method of treating a patient, comprising the steps of:
- identifying a patient having a joint for replacement;
- surgically exposing the joint surface;
- excising an articulating portion of a long bone;
- preparing a proximal portion of the long bone to receive an implant;
- and
- implanting a stem into the proximal portion and intramedullary canal of the long bone, said stem comprising a medial, a lateral, an anterior, and a posterior surface, the surfaces comprising a geometry such that the ratio of medial surface transverse dimension to lateral surface transverse dimension taken in a plane substantially perpendicular to the longitudinal axis of the stem changes along the axial length of the stem from the proximal end of the stem to the distal end of the stem.
The method of treating a patient as in claim 16, wherein said joint is the shoulder and said long bone is the humerus.
The method of treating a patient as in claim 17, additionally comprising the step of accessing the humerus via an incision no more than about 10 cm. in length.
Dependencies are inferred from the claim text.