An electrogoniometer for the measurement of thoracolumbar rotation

A simple, noninvasive method of measuring thoracolumbar rotation was developed using an electrogoniometer mounted on thermoplastic girdles. The instrument is designed to adjust to trunk movement that might occur in the sagittal and coronal planes while transmitting the torque that results from rotation in the horizontal plane directly to the active potentiometer of the electrogoniometer. Experiments were carried out to determine the accuracy, validity and reliability of the device and it was concluded that this method of measurement of horizontal trunk movement could be used in kinematic investigations.