To explore the risk factors for persistent pain after hip replacement.

From January 2014 to June 2017, 814 patients with hip arthroplasty who were collected in Xintang Hospital of Zengcheng District and Southern Hospital in strict accordance with inclusion and exclusion criteria were selected as the subjects of study. Clinical data of patients were collected to observe the correlation between clinical data and postoperative persistent pain. Chi-square test was used for univariate analysis and logistic regression analysis was used for multivariate analysis.

The univariate analysis showed that smoking was not a factor affecting persistent pain after hip replacement (χ²=0.814, P>0.05), sex, age, body mass index, alcohol consumption, long-term analgesic use, type of replacement, type of prosthesis, operation time, duration of anesthesia, time of hip joint movement, post-operative C-reactive protein(C-reactive protein, CRP) were factors affecting persistent pain following hip replacement (χ²=11.826, 14.705, 12.344, 4.184, 15.279, 10.140, 9.837, 8.862, 16.019, 12.864, 23.485, all P<0.05). The multivariate logistic analysis showed that age less than 60 years, body mass index greater than 28 kg/m^2, hip joint activity time less than or equal to two days were independent risk factors for persistent pain after hip replacement (wald χ²=13.716, 18.948, 15.423, all P<0.05).

The continuous pain after hip replacement is the result of multiple factors, these factors should be taken into consideration for targeted prevention and control, so as to reduce the incidence of persistent pain after hip replacement.