Devices, systems, and methods for determining tibia coronal alignment

A system for measuring a tibia varus or valgus angle of a patient, comprising:

• a measurement device that includes:
• a housing that is configured to couple to a musculoskeletal system of the patient;
• an inertial measurement unit disposed within the housing, and including:
• an accelerometer;
• and
• a gyroscope;
• and
• wherein the inertial measurement unit is configured to record a plurality of measurements using the accelerometer and the gyroscope and to preprocess the plurality of measurements by at least removing one or more of the plurality of measurements that exceeds a predetermined maximum angular acceleration, the plurality of measurements indicative of a determined tibia varus or valgus angle;
• and
• a transmitter configured to output:
• (i) the plurality of measurements;
• and (ii) instructions for moving or posing a musculoskeletal system of the patient based on the plurality of measurements.

A non-transitory computer-readable medium storing instructions that are executable by a processor to perform operations, including:

• receiving first data from a measurement system, wherein:
• a housing of the measurement system is coupled to a musculoskeletal system of a patient;
• and
• the first data includes a plurality of measurements from each of an accelerometer and a gyroscope included with an inertial measurement unit disposed within the housing;
• preprocessing the first data by at least removing one or more of the plurality of measurements that exceeds a predetermined maximum angular acceleration;
• receiving a first measurement of a length of a tibia of the patient;
• receiving, based on the first data and the first measurement, a determined tibia varus or valgus angle;
• and
• causing a display to output the determined tibia varus or valgus angle.