Femoral and humeral stem geometry and implantation method for orthopedic joint reconstruction

Abstract

The present inventions relate to devices and methods that improve the positioning and fit of orthopedic reconstructive joint replacement stem implants relative to existing methods. For example, an embodiment of the device provides a stem component comprising proximal and distal body portions that can be configured to mimic a geometric shape of a central cavity region created in a bone of a joint for improving conformance and fixation of the stem component thereto. Further, another embodiment provides a system of stem implants that each have a unique medial offset for facilitating the matching of an implant to the geometry of a central cavity region of a bone. Additionally, an inclination angle of a resection surface of each of the implants in the system can remain constant or vary as a function of the medial offset.

1 .- 14 . (canceled) 
     
     
         15 . A system of orthopedic devices for joint reconstruction surgery, the system comprising:
 an articular component;   a plurality of stem components configured to couple with the articular component, each stem component comprising:
 a distal body portion configured to be inserted into a central cavity region created in a bone of the joint, the distal body portion defining a longitudinal axis, 
 a proximal body portion defining a resection plane configured to be disposed in-plane with a resection surface of a bone when applied to a patient, the longitudinal axis extending through the resection plane, the resection plane defining a proximal-most limit of the proximal body, the proximal-most limit disposed in-plane with the resection surface of the bone, the proximal body for supporting the articular component that in turn has a geometric center positioned within the proximal body portion or at the resection plane, the resection plane oriented at an inclination angle with respect to the longitudinal axis, and 
 an opening in the resection plane of the proximal body; and 
   wherein at least two of the plurality of stem components include different inclination angles.   
     
     
         16 . The system of  claim 15  wherein the opening is configured to receive a portion of the articular component. 
     
     
         17 . The system of  claim 15 , wherein each of the plurality of stem components is monolithic. 
     
     
         18 . The system of  claim 15 , wherein each of the plurality of stem components includes a medial side and a lateral side, the medial side and the lateral side extending from the resection plane of the proximal body portion to a base of the distal body portion. 
     
     
         19 . The system of  claim 18 , wherein each of the medial side and the lateral side comprise a curvature. 
     
     
         20 . The system of  claim 15 , wherein the opening in the resection plane is tapered. 
     
     
         21 . The system of  claim 15 , wherein the geometric center is spaced from the longitudinal axis at a medial offset distance based on the contour of the proximal body portion. 
     
     
         22 . The system of  claim 21 , wherein each of the plurality of stem components of the system has a medial offset of between 4 mm and 15 mm. 
     
     
         23 . The system of  claim 15 , wherein the geometric center lies in the resection plane. 
     
     
         24 . The system of  claim 15 , wherein each of the plurality of stem components is configured to be inserted into a central cavity region of a humerus. 
     
     
         25 . A system of orthopedic devices for joint reconstruction surgery, the system comprising:
 an articular component;   a plurality of stem components configured to couple with the articular component, each stem component comprising:
 a distal body portion configured to be inserted into a central cavity region created in a bone of the joint, the distal body portion defining a longitudinal axis, 
 a proximal body portion defining a resection plane configured to be disposed in-plane with a resection surface of a bone when applied to a patient, the longitudinal axis extending through the resection plane, the resection plane defining a proximal-most limit of the proximal body, the proximal-most limit disposed in-plane with the resection surface of the bone, the proximal body for supporting the articular component that in turn has a geometric center positioned within the proximal body portion or at the resection plane, the resection plane oriented at an inclination angle with respect to a base of the distal body portion, and 
 an opening in the resection plane of the proximal body; and 
   wherein at least two of the plurality of stem components include different inclination angles.   
     
     
         26 . The system of  claim 25  wherein the opening is configured to receive a portion of the articular component. 
     
     
         27 . The system of  claim 25 , wherein each of the plurality of stem components is monolithic. 
     
     
         28 . The system of  claim 25 , wherein each of the plurality of stem components includes a medial side and a lateral side, the medial side and the lateral side extending from the resection plane of the proximal body portion to a base of the distal body portion. 
     
     
         29 . The system of  claim 28 , wherein each of the medial side and the lateral side comprise a curvature. 
     
     
         30 . The system of  claim 25 , wherein the opening in the resection plane is tapered. 
     
     
         31 . The system of  claim 25 , wherein the geometric center is spaced from the longitudinal axis at a medial offset distance based on the contour of the proximal body portion. 
     
     
         32 . The system of  claim 31 , wherein each of the plurality of stem components of the system has a medial offset of between 4 mm and 15 mm. 
     
     
         33 . The system of  claim 25 , wherein the geometric center lies in the resection plane. 
     
     
         34 . The system of  claim 25 , wherein each of the plurality of stem components is configured to be inserted into a central cavity region of a humerus.