System and method for ligament insertion in knee joint surgeries using adaptive migration of ligament insertion geometry

• US 9,629,580 B2
• Filed: 03/18/2015
• Issued: 04/25/2017
• Est. Priority Date: 03/19/2014
• Status: Active Grant

• Current Assignee: Advanced Mechanical Technologies, Inc.
• Original Assignee: Advanced Mechanical Technologies, Inc.
• Inventors: D'Lima, Darryl, White, Bruce F.
• Primary Examiner(s): Ramana, Anu
• Assistant Examiner(s): Weiss, Jessica
• Application Number:
  US14/661,190
• Publication Number:
  US 20150265363A1
• Time in Patent Office: 769 Days
• Field of Search: 600587, 600595, 606102
• CPC Class Codes: A61B 17/1714 for applying tendons or ligaments implements for applying tendons or ligaments A61F2/0805
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61B 2034/105 Modelling of the patient, e.g. for ligaments or bones
• CPC Class Codes: A61B 2034/107 Visualisation of planned trajectories or target regions
• CPC Class Codes: A61B 2505/05 Surgical care
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61B 5/1121 Determining geometric values, e.g. centre of rotation or angular range of movement
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61B 5/4533 Ligaments
• CPC Class Codes: A61B 5/4585 Evaluating the knee

Abstract

A system for providing feedback during ligament insertion in knee joint orthopedic surgeries includes an imaging device providing knee joint articular surface geometry data, a position measuring device providing distal ligament insertion sites, a strain measuring device providing ligament reference strain, a drive system providing a prescribed kinematic path for the knee joint and an adaptive migration application. The adaptive migration application receives inputs including the knee joint articular surface geometry data, the distal ligament insertion sites, the ligament reference strain and the prescribed kinematic path for the knee joint and generates outputs including sets of isotonic, hypertonic and hypotonic points representing proximal insertion sites of ligament fiber associated with prescribed distal ligament insertion sites.

Claims

1. A system for providing feedback during ligament insertion in knee joint orthopedic surgeries comprising:

an imaging device providing knee joint articular surface geometry data;

a position measuring device providing distal ligament insertion sites;

a strain measuring device providing ligament reference strain;

a drive system providing a prescribed kinematic path for the knee joint;

an adaptive migration application configured to receive inputs comprising said knee joint articular surface geometry data, said distal ligament insertion sites, said ligament reference strain and said prescribed kinematic path for the knee joint and to generate outputs comprising sets of isotonic, hypertonic and hypotonic points representing proximal insertion sites of a ligament fiber associated with prescribed distal ligament insertion sites;

wherein the adaptive migration application generates said set of isotonic, hypertonic and hypotonic points so that the ligament fiber stretched between two isotonic points has minimal change in tension throughout a flexion arc.

2. The system of claim 1, wherein the knee joint articular surface geometry data are represented as two tangentially intersecting circular arcs.

3. The system of claim 1, wherein the adaptive migration application generates said set of isotonic, hypertonic and hypotonic points by iteratively adapting the distal ligament insertion sites based on an integral of a ligament tension vector over a flexion arc.

4. The system of claim 3, wherein said integral of the ligament tension vector trends towards a limit of zero with successive iterations of the adaptive migration application and wherein at said limit a distal ligament insertion site is determined that balances tensile and compressive strain over the flexion arc.

5. The system of claim 1, wherein the prescribed kinematic path for the knee joint comprises passive kinematics of the knee joint through a flexion arc.

6. The system of claim 1, wherein the prescribed kinematic path for the knee joint comprises one of flexion, internal rotation, anterior posterior displacement or medial lateral displacement.

7. The system of claim 1, wherein the prescribed kinematic path for the knee joint is applied while the knee joint is constrained in two degrees of freedom.

8. The system of claim 1, wherein the adaptive migration application further determines a cost function based on applied strain magnitude and direction of a strain induced tension in the ligament fiber.

9. The system of claim 8, wherein the adaptive migration application migrates the distal ligament insertion sites in a direction counterpoised to a direction of the induced tension in the ligament fiber throughout a flexion arc.