Abstract: BACKGROUND: The clinical application of hip arthroplasty not only improves the quality of life and lower limb function of patients with femoral neck fracture, but also reduces the mortality of patients. However, the postoperative rehabilitation technology of patients is single, the distribution of rehabilitation doctors is uneven, and the efficacy of the whole population is unknown. Therefore, the application of rehabilitation robot in hip arthroplasty is an effective and safe way.
OBJECTIVE: To explore effect of multi-scene rehabilitation mode based on balance disorder rehabilitation-assisted robot on lower limb function of the elderly after total hip arthroplasty. 
METHODS: A total of 60 patients aged over 60 years old who underwent total hip arthroplasty after femoral neck fracture were recruited from the Orthopedic Ward of Chinese PLA General Hospital and the Affiliated Hospital of Chengdu University from January to June 2021. The patients were randomly divided into study group (n=30) and control group (n=30). The control group was trained by traditional physical therapy combined with walking rehabilitation model of balance disorder rehabilitation-assisted robot, and the study group was trained by traditional physical therapy combined with multi-scene rehabilitation model of balance disorder rehabilitation-assisted robot. After 16 weeks of training, peak torque value data and hip motion data were collected. After 8, 12, and 16 weeks, Berg Scale score and Fugl-Meyer score were collected. 
RESULTS AND CONCLUSION: (1) One case in each of the two groups dropped out, and the remaining 58 cases had no accidental injury during the training and successfully completed the training treatment. (2) At 16 weeks after training, the range of motion of hip joint in the study group was less than that in the control group (P < 0.05). The peak torque of the hip joint in the study group was greater than that in the control group (P < 0.05). (3) With the extension of training time, Berg score and Fugl-Meyer score were increased in both groups. Under the same training time, Berg score and Fugl-Meyer score were higher in the study group than those in the control group (P < 0.05). (4) It is concluded that under the same training time, the effect of balance disorder rehabilitation-assisted robot on lower limb function rehabilitation of the elderly after total hip arthroplasty was better in the multi-scene rehabilitation training mode than in the weight-loss walking training mode, but it showed a trend of fast recovery in the early stage of rehabilitation and slow recovery in the late stage of rehabilitation.

Key words: the elderly, femoral neck fracture, total hip arthroplasty, balance disorder rehabilitation-assisted robot, rehabilitation training