Table 2 Criteria for postoperative function assessment

Excellent

No snapping signs (neither subjective symptom nor objective sensation), normal gait, no LLD or pelvic tilt, full hip range of motion and strength

Good

No snapping signs (neither subjective symptom nor objective sensation), normal gait, LLD < 1.5 cm, no pelvic tilt, nearly full functional hip (can squat down with closing legs, may cannot or difficultly sit with crossing legs)

Fair

No objective GMC signs, may slight subjective feeling of tension. Nearly normal gait, LLD < 2 cm, slight pelvic tilt, possible decreased hip range of motion or strength (cannot or difficultly squat down with closing legs and sit with crossing legs)

Poor

Presence of GMC symptoms or signs, LLD ≥ 2 cm, pelvic tilt, abnormal functional recovery of hip joint (range of motion and strength)