The CHINA TFNA Study

1. Age ≥18 years
2. Patients with unilateral proximal femur fractures that will be treated with intramedullary nail internal fixation

3. According to AO fracture classification, subjects with following fracture type:

   1. Pertrochanteric (31-A1 and 31-A2)
   2. Intertrochanteric (31-A3)
   3. Trochanteric area (31-A1/A2/A3) with diaphyseal extension
4. Subject must be comfortable with speaking and understanding questions and responses in an available translated language for patient reported outcomes (PROs)

Exclusion Criteria:

1. Subject does not provide voluntary consent to participate in the study
2. The subject is a woman who is pregnant or lactating
3. Fractures where the operative treatment will occur more than three weeks after the primary injury
4. Patients with femoral head fractures and femoral neck fractures (AO classification 31-B and 31-C)
5. Pathological fracture (e.g., primary or metastatic tumor)
6. Serious soft tissue injury, judged by the investigator, will impact the union of the fracture, combined vascular injury, and combined osteofascial compartment syndrome
7. Multiple systemic injuries judged by researchers not suitable for enrollment, or orthopaedic fractures in other bones at three or more sites
8. Revision surgeries (for example, due to malunion, nonunion or infection)
9. Concurrent medical conditions judged by researchers not suitable for enrollment, such as: diabetes, metabolic bone disease, post-polio syndrome, poor bone quality, prior history of poor fracture healing, etc
10. Patients with anaesthetic and surgical contraindications
11. Patients known to be allergic to implant components
12. 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)
13. Intemperance judged by researchers not suitable for enrollment (e.g., excessive daily drinking or smoking, drug abuse);
14. Patients participated into other clinical trial in the previous 3 months;
15. Patients with bad compliance judged by researchers and cannot complete the test according to test scheme, such as schizophrenia and dementia.