Abstract:[Objective] To investigate the impact of sarcopenia on the prognosis of hemiarthroplasty for femoral neck fractures. [Methods] A retrospective analysis was performed on 102 patients who underwent hemiarthroplasty due to femoral neck fractures from January2021 to December 2023. According to the Chinese Medical Association's "Consensus on sarcopenia", the patients were divided into twogroups, the sarcopenia group and non-sarcopenia group. The documents regarding perioperative period, follow-up and images were com-pared between the two groups. [Results] Among the 102 patients included in this study, 38 were consistent with sarcopenia, accounting for37.25%, while the remaining 64 were of non-sarcopenia, accounting for 62.75%. All patients in both groups had hemiarthroplasty per-formed successful without serious complications, such as perioperative death. Although there was no significant difference in operativetime, fluoroscopy times, and blood loss between the two groups (P>0.05), the sarcopenia group proved significantly inferior to the non-sarco-penia group in terms of incision healing quality [A/B, (34/4) vs (64/0), P=0.008], ambulation time [(6.7±0.7) days vs (6.0±0.5) days, P<0.001], hospital stay [(12.4±2.2) days vs (10.9±2.0) days, P=0.001], incision healing time [(11.5±1.9) days vs (10.4±1.7) days, P=0.003] andtotal complication rate [cases (%), 6 (15.8) vs 2 (3.1), P=0.021]. In addition, the sarcopenia group resumed full weight-bearing activity sig-nificantly later than the non-sarcopenia group [(74.3±8.5) days vs (70.1±7.4) days, P=0.010]. The extension-flexion range of motion (ROM),interal-external rotation ROM and HHS scores significantly increased in both groups over time (P<0.05). However, the sarcopenia groupwas significantly poorer than the non-sarcopenia group regarding abovesaid itmes at all corresponding time points (P<0.05). As for imagingat the last follow-up, the sarcopenia group were more serious than the non-sarcopenia group in the limb length discrepancy (LLD), the oc-currence of ectopic ossification, prosthesis loosening and acetabular wear, whereas which were not statistically significant between them (P>0.05). [Conclusion] The incidence of sarcopenia in patients with femoral neck fracture is high, and it may affect the prognosis of hemiar-throplasty.