Clinical Research Directory

Inclusion Criteria: 1. Age 18-42 years (studies have reported age ≥42 years as a risk factor for hip arthroscopy in BDDH: HR=11.6, 95% CI: 2.5-53.9), either sex; 2. Symptoms (anterior-lateral groin, lateral, or posterolateral hip pain or discomfort), physical examination findings (limp, clicking, locking, and limited range of motion), and imaging findings consistent with BDDH diagnosis (standing anteroposterior pelvic radiograph with Wiberg lateral center-edge angle \[LCEA\] 18-25°); 3. Surgeon's assessment that the patient with BDDH will benefit from hip arthroscopy or conservative treatment; 4. Full understanding of trial benefits and risks, willingness to participate in the intervention and complete follow-up, and signed informed consent. Exclusion Criteria: 1. Standing anteroposterior pelvic radiograph showing Tönnis grade ≥2 and/or joint space \<2 mm; 2. Standing anteroposterior pelvic radiograph showing FEAR index \>5°; 3. Positive physical examination for joint instability: anterior apprehension test (HEER test), abduction-extension-external rotation test in lateral decubitus position (AB-HEER test), or prone external rotation test; 4. History of high-energy hip trauma, previous ipsilateral or contralateral hip surgery, avascular necrosis of the femoral head, slipped capital femoral epiphysis, Perthes disease, severe osteoporosis, tumor, acetabular stress fracture, or hypertrophic or inflammatory hip disease; 5. Concomitant consciousness disorder, psychiatric illness, or neuromuscular dysfunction affecting lower limb function; 6. Contraindications to hip arthroscopy (such as systemic or local infection).