# US 12,004,967 B2 · Systems and methods for planning placement of an acetabular implant for a patient based on pelvic tilt

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- Number: US 12,004,967 B2
- Document ID: US12004967B2
- Status: Granted
- Kind: B2
- Application number: 17/336,376
- Filed: 2021-06-02
- Published: 2021-12-02
- Granted: 2024-06-11
- Earliest claimed: 2020-06-02
- Assignees: Howmedica Osteonics Corp.
- Applicants: Howmedica Osteonics Corp.
- Inventors: Thomas Francis McCarthy; Vincent Libranda Alipit
- Web page: https://patentgrep.com/patent/US12004967B2

## CPC

- A61F 2/4657: {Measuring instruments used for implanting artificial joints (for surgical instruments A61B90/06)}
- A61B 34/10: Computer-aided planning, simulation or modelling of surgical operations
- A61F 2/4609: {of acetabular cups}
- G16H 20/40: relating to mechanical, radiation or invasive therapies, e.g. surgery, laser therapy, dialysis or acupuncture
- G16H 30/40: for processing medical images, e.g. editing
- G16H 50/50: for simulation or modelling of medical disorders
- A61B 5/1071: {measuring angles, e.g. using goniometers (A61B5/1123 takes precedence)}
- A61B 5/1122: {of movement trajectories}
- A61B 6/505: {for diagnosis of bone}
- A61B 6/5211: {involving processing of medical diagnostic data}
- A61B 2034/108: {Computer aided selection or customisation of medical implants or cutting guides}
- A61B 2034/2048: {using an accelerometer or inertia sensor}
- A61F 2/32: for the hip
- A61F 2002/4633: {for selection of endoprosthetic joints or for pre-operative planning}
- A61F 2002/4668: {for measuring angles}
- A61F: FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS (dental prosthetics A61C)
- A61B: DIAGNOSIS; SURGERY; IDENTIFICATION (usefulness limited to only animals A61D)
- G16H: HEALTHCARE INFORMATICS, i.e. INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR THE HANDLING OR PROCESSING OF MEDICAL OR HEALTHCARE DATA

## Abstract

Systems and methods are provided for planning placement of an acetabular implant for a patient based on pelvic tilt. The system includes one or more sensors to be placed on the patient to provide measurements of a pelvic tilt angle of the patient taken with the patient in various functional positions to produce patient-specific data based on pelvic tilt from which to plan an inclination angle and a version angle of the acetabular implant for the patient.

## Claims

### Claim 1

A system for planning placement of an acetabular implant for a patient based on pelvic tilt, the system comprising:
a display;
one or more sensors to be placed on the patient and operable to provide:
a first measurement taken with the patient in a first functional position to establish an initial sensor tilt angle; and
a second measurement taken, in an image-free mode, with the patient in a second functional position, different than the first functional position, to produce patient-specific data based on pelvic tilt from which to plan an inclination angle and a version angle of the acetabular implant for the patient; and
a system controller operable to:
establish an image-based pelvic tilt angle for the patient for the first functional position;
correlate the initial sensor tilt angle to the image-based pelvic tilt angle,
generate a representation of a virtual, three-dimensional bone model of the patient,
display the representation of the virtual, three-dimensional bone model on the display, and
display a representation of a virtual, three-dimensional model of the acetabular implant on the display.

### Claim 2 (depends on 1)

The system of claim 1, wherein the first functional position is further defined as a standing position.

### Claim 3 (depends on 2)

The system of claim 2, wherein the second functional position is further defined as a seated position, a squat position, or a bending position.

### Claim 4 (depends on 1)

The system of claim 1, wherein the system controller is configured to correlate the initial sensor tilt angle to the image-based pelvic tilt angle by:
setting the initial sensor tilt angle to the image-based pelvic tilt angle; or
zeroing the initial sensor tilt angle such that the second measurement is relative to the image-based pelvic tilt angle.

### Claim 5 (depends on 4)

The system of claim 4, wherein the system controller is configured to correlate the initial sensor tilt angle to the image-based pelvic tilt angle when the first measurement is taken substantially simultaneously with one or more x-ray images of the patient being captured to determine the image-based pelvic tilt angle.

### Claim 6 (depends on 4)

The system of claim 4, wherein the system controller is configured to correlate the initial sensor tilt angle to the image-based pelvic tilt angle when the first measurement is taken at a time that is different than when one or more x-ray images of the patient are captured to determine the image-based pelvic tilt angle.

### Claim 7 (depends on 1)

The system of claim 1, wherein the system controller is operable to establish the image-based pelvic tilt angle by one or more of: receiving the image-based pelvic tilt angle after being input by a user; retrieving the image-based pelvic tilt angle from memory; or measuring the image-based pelvic tilt angle on an image or model.

### Claim 8 (depends on 1)

The system of claim 1, wherein the one or more sensors are operable to provide one or more additional measurements taken, in the image-free mode, and with the patient in one or more additional functional positions, different than the first and second functional positions.

### Claim 9 (depends on 1)

The system of claim 1, wherein the one or more sensors are operable to provide a plurality of additional measurements taken, in the image-free mode, and while the patient moves through a plurality of functional positions to produce dynamic pelvic tilt data.

### Claim 10 (depends on 1)

The system of claim 1, wherein the system controller is operable to determine whether the patient requires one or more x-ray images to be taken based on the second measurement.

### Claim 11 (depends on 1)

The system of claim 1, wherein the one or more sensors are further defined as a pelvic sensor to be placed on a back of the patient, wherein the pelvic sensor includes an inertial measurement unit to measure a pelvic tilt angle of the patient.

### Claim 12 (depends on 1)

The system of claim 1, wherein the system controller is operable to analyze a range of motion of the patient based on the patient-specific data and identify any impingement.

### Claim 13 (depends on 1)

The system of claim 1, wherein the one or more sensors are operable to measure rotation of a patient.

### Claim 14 (depends on 13)

The system of claim 13, wherein the one or more sensors are operable to measure twisting of a pelvis of the patient.

### Claim 15 (depends on 1)

The system of claim 1, wherein the system controller is operable to establish the image-based pelvic tilt angle for the first functional position based on one or more x-ray images captured with the patient in the first functional position.

### Claim 16

A method of planning placement of an acetabular implant for a patient based on pelvic tilt, the method comprising the steps of:
establishing an image-based pelvic tilt angle for the patient for a first functional position;
obtaining a first measurement provided by one or more sensors placed on the patient and taken with the patient in the first functional position to establish an initial sensor tilt angle;
correlating the initial sensor tilt angle to the image-based pelvic tilt angle;
obtaining a second measurement provided by the one or more sensors placed on the patient and taken, in an image-free mode, with the patient in a second functional position, different than the first functional position, to produce patient-specific data based on pelvic tilt from which to plan an inclination angle and a version angle of the acetabular implant for the patient;
generating a representation of a virtual, three-dimensional bone model of the patient;
displaying the representation of the virtual, three-dimensional bone model; and
displaying a representation of a virtual, three-dimensional model of the acetabular implant.

### Claim 17 (depends on 16)

The method of claim 16, wherein establishing the image-based pelvic tilt angle for the first functional position is further defined as establishing the image-based pelvic tilt angle for a standing position; and
wherein obtaining the second measurement taken with the patient in the second functional position is further defined as obtaining the second measurement taken with the patient in a position other than the standing position.

### Claim 18 (depends on 16)

The method of claim 16, wherein correlating the initial sensor tilt angle to the image-based pelvic tilt angle includes:
setting the initial sensor tilt angle to the image-based pelvic tilt angle; or
zeroing the initial sensor tilt angle such that the second measurement is relative to the image-based pelvic tilt angle; and
wherein the first measurement is taken with the one or more sensors substantially simultaneously with capturing one or more x-ray images of the patient.

### Claim 19 (depends on 16)

The method of claim 16, wherein correlating the initial sensor tilt angle to the image-based pelvic tilt angle includes:
setting the initial sensor tilt angle to the image-based pelvic tilt angle; or
zeroing the initial sensor tilt angle such that the second measurement is relative to the image-based pelvic tilt angle; and
wherein the first measurement is taken with the one or more sensors at a time that is different than when capturing one or more x-ray images of the patient.