Before you measure active range of motion generally you check the passive range first so you will know how much range is available. That way you can know if they are limited before they move actively. If they only have 110 degrees of flexion range of motion available, unless you check it passively first you may think that there active range is limited when in fact the overall motion of the joint is limited and they can actively move it to end range. Hope that is helpful and we appreciate your support for our channel.
The greater tubercle is used because it is palpable and it aligns closely with the glenohumeral joint. One of the key concepts with goniometry is that bony landmarks you can feel are used for alignment to try to improve consistency of measurement. Thanks for the question and for watching our videos.
Thanks for watching and we agree that patient safety and comfort is a priority. Based on the reference text used for goniometry, their protocol is to check passive range of motion prior to measuring active. Different resources may choose to follow different protocols.