Robot-Assisted Closed Reduction and Internal Fixation for Femoral Shaft Fractures

Inclusion Criteria： * Age 18 to 80 years, inclusive. * Unilateral, acute, closed femoral shaft fracture. * AO/OTA classification 32-A, 32-B, or 32-C femoral shaft fracture. * Time from injury to surgery no more than 21 days. * Ability to walk independently before injury, with or without assistive devices. * Ability to provide written informed consent. Exclusion Criteria： * Open fracture. * Multiple severe trauma requiring immediate priority management. * Asymmetry of the lower limbs. * History of ipsilateral femoral shaft malunion. * History of ipsilateral femoral deformity that significantly affects assessment of - limb rotation or length. * Ipsilateral fracture at another site. * Pathological fracture caused by tumor, metabolic bone disease, or other underlying bone pathology. * Complex hardware from previous ipsilateral surgery. * History of ipsilateral surgery that significantly affects clinical or radiographic evaluation. * Active infection. * Severe underlying medical condition that makes the patient unable to tolerate surgery. * Cognitive impairment that prevents study participation or follow-up. * Poor compliance with study procedures or follow-up. * Pregnancy or lactation. * Judged by the investigators to be unsuitable for enrollment. * Unable to complete the planned follow-up period. * Refusal to undergo randomization. * Refusal to participate in the clinical study.