Femoral and tibial base components

Abstract

Various embodiments are directed to base components that are usable with implantable mechanical energy absorbing systems. According to one embodiment, the base component includes a low-profile body having a elongate, straight portion at a first end and a curved body portion at a second end. The second end is elevated as compared to the first end. An inner surface of the low-profile body has a raised portion extending along the elongate, straight portion of the low-profile body. The base component also includes a plurality of openings positioned along the low-profile body for alignment and purposes of affixation to body anatomy.

1 - 9 . (canceled) 
   
   
       10 . An implantable extra-articular mechanical energy absorbing system, comprising:
 an absorber, the absorber configured to absorb a predetermined load; and   a base including a low-profile body having a mounting portion configured to be operatively connected to the absorber and a bone contacting surface having a selected surface area configured to promote a bone response such as osteointegration.   
   
   
       11 . The system of  claim 10 , wherein the mounting portion is elevated above the bone surface to position the absorber outside the joint capsule. 
   
   
       12 . The system of  claim 10 , further comprising one or more projections extending from the bone contacting surface. 
   
   
       13 . The system of  claim 10 , further comprising one or more through holes positioned along the low-profile body, the through holes configured to receive fastening members. 
   
   
       14 . The system of  claim 10 , wherein osteointegration is promoted by a coating applied to the bone contacting surface. 
   
   
       15 . The system of  claim 10 , wherein osteointegration is promoted by providing the base contacting surface with a roughened surface. 
   
   
       16 . The system of  claim 10 , wherein the bone contacting surface is contoured for a medial portion of a femur or a tibia. 
   
   
       17 . The system of  claim 10 , wherein the bone contacting surface is contoured for a femur or tibia. 
   
   
       18 . The system of  claim 10 , wherein the selected surface area is about 39 mm2 or greater. 
   
   
       19 . The system of  claim 10 , wherein the bone response is mechanical interlocking into the base. 
   
   
       20 . The system of  claim 10 , wherein the bone response is chemical bonding onto the base. 
   
   
       21 . The surface of  claim 10 , wherein the interface between the osteointegrated surface and bone has a shear strength of about 3 MPa or greater without support from fasteners. 
   
   
       22 . The system of  claim 10 , wherein the shear strength of the base-bone interface is greater than the shear stress applied by the forces of the absorber. 
   
   
       23 . An implantable extra articular system comprising a base including a periosteum contacting surface and a mounting surface, the mounting surface configured to operatively connect to a link wherein the mounting surface overlies bone and is displaced from the bone.