Total elbow arthroplasty system
First Claim
1. A two component elbow endoprosthesis comprising:
- a humeral component, the humeral component comprising;
(i) a condylar portion adapted to be received in a resected portion of a distal humerus between the medial and lateral aspects of the humeral condyle, the condylar portion having a proximal end and a distal end and comprising a proximal portion disposed at the proximal end and an isometric articulating surface, a medial side and a lateral side disposed at the distal end, the proximal portion having a longitudinal axis and a first cross-sectional area, the articulating surface comprising an arcuate groove disposed circumferentially along the distal end of the condylar portion, midway between the medial side and the lateral side, and(ii) a humeral stem portion attached to the proximal portion of the condylar portion, the humeral stem adapted to be received in the medullary canal of the distal humeral shaft, the humeral stem portion having a proximal end and a longitudinal axis angled cranially with respect to the longitudinal axis of the proximal portion, the stem portion having a second cross sectional area smaller than the first cross-sectional area of the proximal portion, thereby forming a shoulder between the humeral stem portion and the proximal portion; and
a radioulnar component for articulating with the humeral component, the radioulnar component comprising;
(i) a head portion comprising an isometric arcuate articulating ridge adapted to articulate with the arcuate groove of the humeral component,(ii) a radial stem portion attached to the head portion adapted to be received in the medullary canal of a proximal radial shaft, and(iii) an ulnar stem portion attached to the head portion adapted to be received in the medullary canal of a proximal ulnar shaft.
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Accused Products
Abstract
The present invention is directed to novel two piece total elbow arthroplasty systems. In particular, the present invention is directed to total elbow implants, bone cutting guides for the installation of the implants, and methods for total elbow replacement. The apparatus and methods of the present invention are useful in the treatment of elbow osteoarthritis in canines, as well as in other species, including other quadrupeds and humans. The two piece implant of the present invention has an isometric humeral component and a radioulnar component that has an isometric articular surface. The components have stems for mounting in the medullary canals of the respective bones, which are angled so as to approximate the configuration of the original humerus, radius and ulna. In addition, novel cutting guides are provided to facilitate the removal of arthritic cartilage and a minimal amount of adjacent bone, thereby allowing the implantation of the two components (humeral and radioulnar), which are held in place by cement, such as polymethylmethylacrylate (PMMA). The result is a pain-free joint that has a near normal range of motion. Finally, the invention is directed to methods for implanting the novel endoprosthesis of the present invention in a canine elbow joint.
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Citations
14 Claims
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1. A two component elbow endoprosthesis comprising:
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a humeral component, the humeral component comprising; (i) a condylar portion adapted to be received in a resected portion of a distal humerus between the medial and lateral aspects of the humeral condyle, the condylar portion having a proximal end and a distal end and comprising a proximal portion disposed at the proximal end and an isometric articulating surface, a medial side and a lateral side disposed at the distal end, the proximal portion having a longitudinal axis and a first cross-sectional area, the articulating surface comprising an arcuate groove disposed circumferentially along the distal end of the condylar portion, midway between the medial side and the lateral side, and (ii) a humeral stem portion attached to the proximal portion of the condylar portion, the humeral stem adapted to be received in the medullary canal of the distal humeral shaft, the humeral stem portion having a proximal end and a longitudinal axis angled cranially with respect to the longitudinal axis of the proximal portion, the stem portion having a second cross sectional area smaller than the first cross-sectional area of the proximal portion, thereby forming a shoulder between the humeral stem portion and the proximal portion; and a radioulnar component for articulating with the humeral component, the radioulnar component comprising; (i) a head portion comprising an isometric arcuate articulating ridge adapted to articulate with the arcuate groove of the humeral component, (ii) a radial stem portion attached to the head portion adapted to be received in the medullary canal of a proximal radial shaft, and (iii) an ulnar stem portion attached to the head portion adapted to be received in the medullary canal of a proximal ulnar shaft. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for implanting an elbow endoprosthesis in an elbow joint, comprising the steps of:
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removing the trochlea of the humerus; removing the articular surface of the ulna and radius and cancellous bone from the proximal medullary canals of the ulna and radius, and, in any order, inserting a radioulnar component into the medullary canals of the radius and ulna and affixing the radioulnar component in place; inserting bone graft between the proximal radius and ulna to encourage rapid synostosis; and inserting a humeral component into the medullary canal of the humerus and affixing the humeral component in place, and wherein the elbow endoprosthesis comprises; a humeral component, the humeral component comprising; (i) a condylar portion adapted to be received in a resected portion of a distal humerus between the medial and lateral aspects of the humeral condyle, the condylar portion having a proximal end and a distal end and comprising a proximal portion disposed at the proximal end and an isometric articulating surface, a medial side and a lateral side disposed at the distal end, the proximal portion having a longitudinal axis and a first cross-sectional area, the articulating surface comprising an arcuate groove disposed circumferentially along the distal end of the condylar portion, midway between the medial side and the lateral side, and (ii) a humeral stem portion attached to the proximal portion of the condylar portion, the humeral stem adapted to be received in the medullary canal of the distal humeral shaft, the humeral stem portion having a proximal end and a longitudinal axis angled cranially with respect to the longitudinal axis of the proximal portion, the stem portion having a second cross sectional area smaller than the first cross-sectional area of the proximal portion, thereby forming a shoulder between the humeral stem portion and the proximal portion; and a radioulnar component for articulating with the humeral component, the radioulnar component comprising; (i) ahead portion comprising an isometric arcuate articulating ridge adapted to articulate with the arcuate groove of the humeral component, (ii) a radial stem portion attached to the head portion adapted to be received in the medullary canal of a proximal radial shaft, and (iii) an ulnar stem portion attached to the head portion adapted to be received in the medullary canal of a proximal ulnar shaft.
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Specification