Table 2.

Grades of ESHS based on the degree of snapping from patient symptoms and clinical signs—

reproduced from Kim et al. [33]

Grade	Degree of snapping
I	Patient complaints of slight or occasional popping symptom on trochanteric area, but not definitely palpated on physical examination
II	Definitely palpable popping symptom on physical examination continuously, but not visually seen
III	Marked snapping symptom visually seen or occasionally accompanied by audible sound