Systems and methods for assessing gait, stability, and/or balance of a user

A system for assessing movement of one or more body portions, comprising:

• one or more inertial sensors positioned on one or more body portions;
• a processor communicatively coupled to the one or more inertial sensors;
• and a memory, coupled to the processor, configured to store program instructions, wherein, when executed by the processor, the program instructions cause the processor to perform a method comprising:
• via a joint-sensor model:
• receiving a sensor signal using the one or more inertial sensors, the sensor signal indicative of movement of the one or more body portions over a time period,
• analyzing the sensor signal of the one or more body portions to determine a movement of the one or more body portions, and
• determining a sensor confidence level based, at least in part, on a characteristic of the sensor signal over the time period;
• and
• via a posture model:
• selecting the sensor signal as an input based on the sensor confidence level,
• tracking movement changes of the one or more body portions over the time periods;
• analyzing the input and the movement changes to determine a movement pattern of the one or more body portions;
• determining, based on the movement pattern, an indication of a degree of abnormaility of a joint movement or a muscle weakness;
• and
• outputting the movement pattern and the indication to a user.