Modular revision femoral prosthesis
AssigneeZimmer, Inc.
InventorJeffrey Paul Dickerson
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Abstract
A femoral prosthesis for use during a revision procedure includes a proximal body, a distal stem, a modular neck, and a head. In operation, a surgeon may stabilize the proximal body and the distal stem of the prosthesis in a patient's femoral canal that has moderate loss of metaphyseal cancellous bone (known as a Paprosky Type I femoral defect), extensive loss of metaphyseal cancellous bone (known as a Paprosky Type II femoral defect), or extensive metaphyseal deterioration and some diaphyseal deterioration (known as a Paprosky Type IIIA femoral defect). Without disturbing this arrangement, the surgeon may then position the head in a desired location by selecting a desired modular neck to obtain proper joint kinematics.
Claims17
A revision femoral prosthesis configured for implantation in a patient's proximal femur, the prosthesis including a proximal end, a distal end, and a longitudinal axis that extends along a length of the prosthesis from the proximal end to the distal end, the prosthesis comprising:
- a proximal body located at the proximal end of the prosthesis, the proximal body having a cylindrical shape, wherein a medial protrusion extends from the proximal body;
- a distal stem located at the distal end of the prosthesis, the distal stem tapering from a proximal end of the distal stem toward the distal end of the prosthesis, wherein the proximal body below the medial protrusion and above the distal stem has a constant circular cross-section along its length;
- and
- a modular neck removably coupled to the proximal body.
A revision femoral prosthesis configured for implantation in a patient's proximal femur, the prosthesis including a proximal end, a distal end, a longitudinal axis that extends along a length of the prosthesis from the proximal end to the distal end, an anterior side, a posterior side, a medial side, and a lateral side, the prosthesis comprising:
- a proximal body located at the proximal end of the prosthesis;
- a distal stem located at the distal end of the prosthesis, the distal stem tapering at a taper angle toward the distal end, the anterior side of the distal stem defining an anterior bevel at the distal end of the prosthesis, and the posterior side of the distal stem defining a posterior bevel at the distal end of the prosthesis, wherein a medial side and a lateral side of the distal stem taper at the taper angle beyond at least a portion of the anterior bevel and the posterior bevel;
- and
- a modular neck removably coupled to the proximal body.
Dependencies are inferred from the claim text.