Three Cancellous Screws Versus Four Cancellous Screws for Femoral Neck Fixation

Inclusion Criteria: * Age ≥18 years * Patients with unilateral femoral neck fractures that will be treated with internal fixation * According to AO fracture classification, subjects with the fracture type (31-B) * Subjects (with the help of relatives) can understand the informed documents and patient questionnaires. * Subjects (with the help of relatives) voluntarily provide written informed consent to participate in the clinical study and authorize the transfer of their information to the sponsor. * The investigator believes that the subject can understand the clinical study, is willing and able to complete all research procedures and follow-up visits and can cooperate with the research procedures. * In-label use of the MCS. Exclusion Criteria: * Subject does not provide voluntary consent to participate in the study. * The researcher believes that the subjects have conditions that affect the participation and follow-up of this study. (for example, the patient lives in a remote area or has difficulty in going back to the hospital for follow-up or does not cooperate with the medical guidance and suggestions of the surgeon.) * The subjects were pregnant or lactating women. * The researchers believe that the subjects have psychological disorders, which may affect the treatment outcome. * Garden classification III and IV of femoral neck fracture patients older than 65 years * Concurrent hip osteoarthritis. * Fractures where the operative treatment will occur more than three we…