Brannock Shoe size
Exam containing this measurement:
The External and Internal Hip Excursion reveal how much movement is available at the hip. When a person turns their head and core to look to the side they have to use muscles at the hip to give them that range of motion. That same range of motion also comes to play in walking because the legs have their safe, optimal and stable range that they prefer to move in and through for ease and efficiency. Walking outside of this preferred range can strain and damage muscles at the hip and can also cause other muscles at the knee or ankle to compensate and overwork themselves due to a lack of motion or too much excess motion in the hip during walking. This test and measurement in respect to the ASIS is essential to determine the amount of rotation preferred in the hip while standing and moving.
Effect of Deviation
More external = increased medial foot plantar pressure
More internal = increased lateral foot plantar pressure