Patient-matched acetabular alignment tool

Abstract

Systems, devices, and methods are provided for aligning acetabular implants. A patient-matched acetabular alignment tool is used to orient tools and implants intraoperatively. The patient-matched acetabular alignment tool includes a mounting member and leg members which are configured based on the particular patient's anatomic landmark sites (e.g., acetabular bony landmarks). The leg members are attached to the mounting member and configured to connect with a respective anatomic landmark site to achieve a desired implant angle and axis. For example, the leg members may form a tripod support base through which an acetabular shell may be inserted into the patient's acetabulum at desired angles of version and inclination. In some embodiments, the leg members may be retractable and expandable with respect to the mounting member, thereby providing a tool with reduced profile for inserting the device in the patient's soft tissue.

1 . An orthopedic device comprising:
 a mounting member positioned on an orthopedic implantation tool, the mounting member having a plurality of attachment sites; and   one or more leg members that correspond with one or more anatomic landmark sites, wherein each leg member couples with the mounting member at one of the plurality of attachment sites and is actuatable to a predetermined configuration with respect to the tool, such that, when actuated to that predetermined configuration, the leg extends outwardly from the longitudinal axis and aligns the mounting member with a predetermined implant axis.   
     
     
         2 . The orthopedic device of  claim 1 , further comprising two or more leg members having different shapes, different lengths, different widths, different thicknesses, different material compositions, or a combination thereof. 
     
     
         3 . The orthopedic device of  claim 1 , wherein each leg member has at least one feature that is selected based on a model of a patient's anatomy and the desired implant axis. 
     
     
         4 . The orthopedic device of  claim 1 , wherein the implant axis defines a desired version angle with respect to a patient's acetabulum. 
     
     
         5 . The orthopedic device of  claim 1 , wherein the implant axis defines a desired inclination angle with respect to a patient's acetabulum. 
     
     
         6 . The orthopedic device of  claim 1 , wherein the leg members are retractable with respect to the mounting member. 
     
     
         7 . The orthopedic device of  claim 6 , further comprising an expanding mechanism that causes retracted leg members to expand when actuated. 
     
     
         8 . The orthopedic device of  claim 1 , wherein the anatomic landmark site comprises at least one bony landmark. 
     
     
         9 . The orthopedic device of  claim 8 , wherein the at least one bony landmark comprises an anterior inferior iliac spine, acetabular limbus, ischial spine, pubic tubercle, or acetabular notch. 
     
     
         10 . The orthopedic device of  claim 1 , wherein the implant axis is a patient-matched implant axis indicative of a pre-selected path over which an implant is to be oriented with respect to a patient's bone. 
     
     
         11 . The orthopedic device of  claim 1 , wherein the predetermined configuration includes a first leg member having a different length than a second leg member. 
     
     
         12 . A method for aligning an orthopedic tool, comprising:
 selecting at least one leg member from a plurality of leg members, wherein each selected leg member has a pre-determined configuration that corresponds to a respective anatomic landmark site;   coupling each selected leg member to a mounting member at a location that corresponds to the pre-determined configuration; and   actuating the mounting member such that each selected leg member reaches its respective anatomic landmark site.   
     
     
         13 . The method of  claim 12 , wherein selecting the at least one leg member comprises selecting two or more leg members having different lengths, different widths, different thicknesses, different material compositions, or a combination thereof. 
     
     
         14 . The method of  claim 12 , further comprising creating a computerized model of a patient site and identifying anatomic landmark sites from the model. 
     
     
         15 . The method of  claim 14 , further comprising determining a desired implant axis from the patient site model, wherein at least one leg member is selected based on the implant axis and one of the anatomic landmark sites. 
     
     
         16 . The method of  claim 15 , wherein determining a desired implant axis comprises defining a desired version angle with respect to the patient's acetabulum. 
     
     
         17 . The method of  claim 15 , wherein determining a desired implant axis comprises defining a desired inclination angle with respect to the patient's acetabulum. 
     
     
         18 . The method of  claim 14 , further comprising extracting data from at least one of an X-ray, a CT scan, and an MRI scan. 
     
     
         19 . The method of  claim 18 , further comprising creating a physical model of the patient site based on the computerized model. 
     
     
         20 . The method of  claim 19 , further comprising positioning the mounting member on the physical model such that each leg member mates with its respective anatomic landmark site on the physical model. 
     
     
         21 . The method of  claim 20 , further comprising comparing a longitudinal axis of the mounting member positioned on the physical model with a desired axis. 
     
     
         22 . The method of  claim 10 , further comprising retracting the leg members with respect to the mounting member. 
     
     
         23 . The method of  claim 22 , further comprising expanding the leg members with respect to the mounting member when the mounting member is inserted into a patient site. 
     
     
         24 .- 26 . (canceled) 
     
     
         27 . A method for aligning an orthopedic tool, comprising:
 selecting at least one actuatable leg member from a plurality of leg members;   coupling each selected actuatable leg member to a mounting member;   inserting the mounting member into a patient site; and   aligning the mounting member with respect to the patient site by actuating each of the selected leg members until it mates with a respective anatomic landmark site.   
     
     
         28 .- 34 . (canceled) 
     
     
         35 . A method for manufacturing an orthopedic tool, comprising:
 receiving data associated with at least one of an X-ray, a CT scan, and an MRI scan;   determining an implant axis based on the received data;   determining a respective configuration for one or more leg members based on the received data; and   producing the one or more leg member according to the determined configurations.   
     
     
         36 . The method of  claim 35 , wherein the determining the respective configuration for one or more leg members comprises determining the respective configuration for two or more leg members having different lengths, different widths, different thicknesses, different material compositions, or a combination thereof. 
     
     
         37 . The method of  claim 35 , further comprising coupling each leg member to a mounting member positioned on the orthopedic implantation tool, the mounting member having a plurality of attachment sites, wherein each leg member couples to the mounting member at one of the plurality of attachment sites. 
     
     
         38 .- 44 . (canceled) 
     
     
         45 . The method of  claim 35 , wherein the respective configuration includes one of a length, a width, a thickness, a material composition, and a combination thereof. 
     
     
         46 . The method of  claim 35 , wherein each leg member is actuatable to a predetermined configuration with respect to the tool, such that, when activated to that predetermined configuration, the leg extends outwardly from a longitudinal axis of the tool and aligns the tool with the determined implant axis.