System and method for assessing, measuring, and correcting an anterior-posterior bone cut

• US 9,566,020 B2
• Filed: 09/13/2013
• Issued: 02/14/2017
• Est. Priority Date: 03/18/2013
• Status: Active Grant

• Current Assignee: Howmedica Osteonics Corp. (Stryker Corporation)
• Original Assignee: OrthoSensor, Inc (Stryker Corporation)
• Inventors: Stein, Marc, Roche, Martin
• Primary Examiner(s): WOODALL, NICHOLAS W
• Application Number:
  US14/026,620
• Publication Number:
  US 20140276860A1
• Time in Patent Office: 1,250 Days
• US Class Current: 1/1
• CPC Class Codes: A61B 17/154 for preparing bone for knee prosthesis
• CPC Class Codes: A61B 17/155 Cutting femur
• CPC Class Codes: A61B 17/157 Cutting tibia
• CPC Class Codes: A61B 17/1764 for the knee
• CPC Class Codes: A61B 2034/102 Modelling of surgical devices, implants or prosthesis
• CPC Class Codes: A61B 2034/104 Modelling the effect of the tool, e.g. the effect of an implanted prosthesis or for predicting the effect of ablation or burring
• CPC Class Codes: A61B 2034/105 Modelling of the patient, e.g. for ligaments or bones
• CPC Class Codes: A61B 34/10 Computer-aided planning, simulation or modelling of surgical operations
• CPC Class Codes: A61B 34/20 Surgical navigation systems; Devices for tracking or guiding surgical instruments, e.g. for frameless stereotaxis
• CPC Class Codes: A61B 34/25 User interfaces for surgical systems
• CPC Class Codes: A61B 5/103 Detecting, measuring or recording devices for testing the shape, pattern, colour, size or movement of the body or parts thereof, for diagnostic purposes A61B5/08 takes precedence; measuring aids for tailors A41H1/00; measuring instruments specially adapted for dentistry A61C19/04
• CPC Class Codes: A61B 5/1036 Measuring load distribution, e.g. podologic studies
• CPC Class Codes: A61B 5/1072 measuring distances on the body, e.g. measuring length, height or thickness A61B5/1076 takes precedence
• CPC Class Codes: A61B 5/1121 Determining geometric values, e.g. centre of rotation or angular range of movement
• CPC Class Codes: A61B 5/45 For evaluating or diagnosing the musculoskeletal system or teeth A61B5/1036, A61B5/1074, A61B7/006 take precedence
• CPC Class Codes: A61B 5/4528 Joints A61B5/4533, A61B5/4538 take precedence
• CPC Class Codes: A61B 5/4571 Evaluating the hip
• CPC Class Codes: A61B 5/4585 Evaluating the knee
• CPC Class Codes: A61B 5/4851 Prosthesis assessment or monitoring
• CPC Class Codes: A61B 5/4887 Locating particular structures in or on the body
• CPC Class Codes: A61B 5/686 : Permanently implanted devices, e.g. pacemakers, other stimulators, biochips A61B5/6861 takes precedence
• CPC Class Codes: A61B 90/37 : Surgical systems with images on a monitor during operation
• CPC Class Codes: A61F 2/38 : for elbows or knees
• CPC Class Codes: A61F 2/3836 : Special connection between upper and lower leg, e.g. constrained
• CPC Class Codes: A61F 2/461 : of knees
• CPC Class Codes: A61F 2/4657 : Measuring instruments used for implanting artificial joints for surgical instruments A61B90/06
• CPC Class Codes: A61F 2/4684 : Trial or dummy prostheses
• CPC Class Codes: A61F 2002/4658 : for measuring dimensions, e.g. length
• CPC Class Codes: A61F 2002/4668 : for measuring angles
• CPC Class Codes: G06F 3/0481 : based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance

Abstract

A system and method is disclosed herein for measuring anterior-posterior slope of a bone to set a cutting jig coupled to the muscular-skeletal system. The system comprises a sensored module that can be placed within a prosthetic component to measure anterior-posterior slope. The system further includes a remote system for receiving, processing, and displaying quantitative measurements from the sensors. A first bone and a second bone are placed in extension. A sensored module is referenced to a bone landmark of the first bone. The sensored module includes a three-axis accelerometer that is configured to measure position, tilt, and rotation. A bone cutting jig is coupled to the first bone. The sensored insert is coupled to the bone cutting jig. The accelerometer in the sensored insert is used to measure the anterior-posterior slope. The bone cutting jig is then adjusted to a predetermined anterior-posterior slope as measured by the sensored insert.

Claims

1. A method of measuring anterior-posterior slope or tilt in support of a bone cut comprising the steps of:

placing a first bone and a second bone in a predetermined position;

coupling a first bone cutting jig to the first bone;

coupling a prosthetic component to the first bone cutting jig wherein the prosthetic component houses a position measurement system configured to measure position, tilt, or rotation, wherein the prosthetic component houses at least one sensor configured to measure a parameter, and wherein the prosthetic component is not installed in the musculoskeletal system when coupled to the first bone cutting jig;

measuring the anterior-posterior (A-P) slope of a bone cut of the first bone with the position measurement system in the prosthetic component;

preparing the bone surface of the first bone haying the A-P slope measured by the position measurement system in the prosthetic component;

subsequently installing the prosthetic component in the musculoskeletal system; and

measuring the parameter with the at least one sensor.

2. The method of claim 1 further including the steps of:

zeroing the position measurement system of the prosthetic component to a first reference plane; and

zeroing the position measurement system of the prosthetic component to a second reference plane where the second reference plane is perpendicular to the first reference plane.

3. The method of claim 2 where the step of zeroing the position measurement system of the prosthetic component to a first reference plane comprises the steps of:

placing the prosthetic component on the first reference plane; and

measuring the first reference plane;

reversing a position of the prosthetic component on the first reference plane 180 degrees;

measuring the first reference plane wherein the position measurement system comprises an inertial sensor;

averaging measurements of the first reference plane where the position measurement system is referenced to gravity; and

zeroing the position measurement system to the averaged measurements of the first reference plane where the first reference plane corresponds to zero gravity.

4. The method of claim 1 further including the steps of:

placing a bone cutting jig shim on the prosthetic component; and

inserting a tab of the bone cutting jig shim into a cutting slot of first bone cutting jig to couple and align the prosthetic component to the first cutting.

5. The method of claim 1 further including the steps of:

monitoring the position of the first and second bones on a remote system;

monitoring the anterior-posterior slope of the bone cut of the first bone cutting jig on the remote system; and

adjusting the first bone cutting jig to cut an anterior-posterior slope or tilt to a first predetermined slope.

6. The method of claim 5 further including the steps of:

coupling a second bone cutting jig to the second bone;

coupling the prosthetic component to the second bone cutting jig; and

measuring the anterior-posterior slope of a bone cut of the second bone with the position measurement system of the prosthetic component wherein the prosthetic component is not installed in the musculoskeletal system when coupled to the second bone cutting jig.

7. The method of claim 6 further including the steps of:

monitoring the anterior-posterior slope of the bone cut of the second bone cutting jig on the remote system; and

adjusting the second bone cutting jig to cut an anterior-posterior slope or tilt to a second predetermined slope.

8. The method of claim 7 further including a step of adjusting the bone cut of the second bone cutting jig to cut an anterior-posterior slope of the second bone parallel to the bone cut of the first cutting jig using data from the position measurement system of the prosthetic component.

9. The method of claim 1 further including a step of generating a reference position by coupling the prosthetic component to a bone landmark wherein a position, tilt, or rotation is measured corresponding to a position of the first or second bones and wherein the prosthetic component is not installed in the musculoskeletal system when coupled to the bone landmark.

10. The method of claim 1 further including the steps of:

installing the prosthetic component into the musculoskeletal system;

measuring at least one parameter with the prosthetic component installed into the musculoskeletal system;

transmitting measurement data to a computer.

11. The method of claim 10 further including a step of installing the prosthetic component in a prosthetic joint.

12. The method of claim 11 further including measuring loading on the prosthetic component applied by the musculoskeletal system wherein the prosthetic component is an insert.

13. The method of claim 10 further including a step of installing the prosthetic component in a knee joint.