Thank you for the question and good observation. With this test though the proximal or stationary arm is aligned with the midline of the pelvis, so in theory if the pelvis does move the proximal arm should move with it as well and it won't effect the actual amount of hip flexion. When performing this measurement if a posterior tilt happens it is helpful to cue the patient to keep there pelvis stationary and re-test.

Thank you for watching our videos, we are glad they are helpful. You are measuring motion of the femur relative to the pelvis so the stationary arm aligns with the superior-inferior midline of the pelvis and the moving arm is on the midline of the femur. Good luck with your studies.

Thank you for supporting our channel. We generally don't include a specific number in our videos but in this case you can read that the hip ROM was 120 degrees.

​@physicaltherapyeducationso4585 is that good or bad.. i know i cant on my own lift my leg more than 5 inches off the floor/bed without pain and discomfort but i havd NO cartilage between my hip and thigh joint

@@vernonherb 120 degrees is considered normal range for an adult male without any hip pathology. When there is arthritis in the joint the range of motion can certainly be limited.