Application of PNE in Postoperative Pain Management of Patients With Primary Total Knee Arthroplasty

Inclusion Criteria: 1. Patients diagnosed as KOA according to the criteria and undergoing unilateral total knee arthroplasty for the first time; 2. The subjects included in this study were men or women aged 45-74 years; 3. Clear self-cognition, can browse the text by themselves or can answer questions correctly; 4. Those who voluntarily participated in the study and signed an informed consent form after understanding the relevant information of the study; 5. Without serious physical diseases such as heart, liver or kidney; 6. No history of mental illness or drug dependence. Exclusion Criteria: 1. Combined with severe trauma in other parts; 2. Accompanied by serious damage to other organs, such as heart and cerebrovascular diseases, lung and kidney diseases; 3. Patients with knee tumor and severe knee deformity who could not complete the rehabilitation; 4. With neurological diseases that limit physical activity; 5. Participating in other investigators during the same period.