The HeadX Duo is a head-mounted cervical assessment and rehabilitation device that combines a patented crosshair laser with an integrated nine-axis inertial measurement unit (IMU). It measures and records head and neck movement in real time, capturing range of motion, movement velocity, symmetry, and joint position sense across multiple axes. Data is transmitted via Bluetooth to dedicated iOS and Android applications.

The HeadX Kross provides real-time visual feedback through a crosshair laser and is used for clinical assessment and exercise delivery without data capture. The HeadX Duo retains the same crosshair laser and adds objective digital measurement: the integrated IMU captures angular movement data during live use, which is recorded and stored in the companion app. The Duo is designed for practitioners who require quantified, longitudinal outcome data alongside the visual feedback provided by the laser.

The HeadX Duo measures cervical range of motion (CROM) across flexion, extension, left and right rotation, and lateral flexion. It also supports Joint Position Sense (JPS) assessment, capturing the angular error between a target position and the patient's repositioning accuracy. Movement velocity, control, repeatability, and left-right symmetry can also be derived from the recorded data.

The HeadX Duo supports Cervical Range of Motion (CROM) assessment and Joint Position Sense (JPS) testing as primary clinical protocols. It is used in concussion assessment, post-whiplash monitoring, chronic neck pain evaluation, vestibular rehabilitation, and high-performance sports screening.

Data is recorded in real time via the HeadX Duo app on iOS or Android. All session data is stored locally on the clinician's device, ensuring full practitioner control over patient information without dependency on third-party cloud services. Data can be exported for offline analysis, longitudinal tracking, or research reporting.

The HeadX Duo is designed for physiotherapists, sports medicine clinicians, neurological rehabilitation specialists, and performance practitioners who require objective, repeatable cervical movement data to support clinical decision-making, outcome monitoring, or research.