Comparison of Clinical Efficacy Between Dynamic Dip Screw and Cannulated Compression Screw for Fresh Femoral Neck Fracture

Inclusion Criteria: * fresh femoral neck fracture * can walk before fracture * less than 65 years old Exclusion Criteria: * Patients combined with other bone fractures. * Pathological fracture (e.g., primary or metastatic tumor) * Serious soft tissue injury, judged by the investigator, will impact the union of the fracture, combined open fractures, vascular injury, and combined osteofascial compartment syndrome. * Multiple systemic injuries judged by researchers not suitable for enrollment. Revision surgeries (for example, due to malunion, nonunion or infection) * Concurrent medical conditions judged by researchers not suitable for enrollment, such as: metabolic bone disease, post-polio syndrome, poor bone quality, prior history of poor fracture healing, etc * Patients known to be allergic to implant components * Patients who are currently using chemotherapeutics or accepting radiotherapy, use systematically corticosteroid hormone or growth factor, or long-term use sedative hypnotics (continuous use over 3 months) or non-steroidal anti-inflammatory drugs (continuous use over 3 months) * Subjects have significant neurological or musculoskeletal disorders or may have adverse effects on gait or weight-bearing (e.g., muscular dystrophy, multiple sclerosis, cerebral infarction, hemiplegia, Charcot arthropathy, avascular necrosis of the femoral head).