Factors Related To Prosthesis Subsidence Of Immediate Weight Bearing After Cementless Total Hip Arthroplasty

Background and purpose: The technology of total hip arthroplasty has been improved increasingly. People who receive total hip arthroplasty need their quality of lives improved gradually. Therefore, other than surgical technique and prosthesis design, there is a growing focus on the treatment of post-operative rehabilitation. The problem, a controversial issue since the 1980s, that whether patients who receive uncemented total hip arthroplasty should get early full weight bearing postoperatively, has become a focus of academic research. With the hope of finding the facters that influence early subsidence and even survival time of the prosthesis, we began radiologic studies on patients received uncemented total hip arthroplasty.Subjects and Methods: I had 10 selected cases over the past for my study. All patients selected got standard AP hip films, the first two days after the operation, they would have regular rehabilitation training, and full weight bearing ambulation would begin at the third day after surgery, then once again we would take another AP hip film on the tenth day. These 20 radiographic films would be analyzed and measured the subsidence of the stem for comparison. We use statistical software to analyze subsidence measured and sex, weight, height and BMI and other factors to explore their relevance, which will help us to determine if factors we mentioned above will affect subsidence of uncemented total hip arthroplasty prosthesis.Results: After analyzed all data of 7 males and 5 females using SPSS17.0, we learn there is no statistically significant (p = 0.194) of stem subsidence between men and women, that is to say, stem subsidence between the sexes have no difference since 10 days postoperatively. We take linear regression analysis using SPSS17.0 to find there is a linear correlation (p = 0.000) between subsidence of the prosthesis and body weight. We take linear regression analysis using SPSS17.0 to find there is no linear correlation (p = 0.323) between height and stem subsidence. We take linear regression analysis using SPSS17.0 to find there is no linear correlation (p = 0.631) between subsidence of the prosthesis and BMI .Conclusion: After analyze all these factors of the 10 patients of immediately full weight bearing after uncemented total hip replacement We can conclude that:1. There is no statistically significant (p = 0.194) of stem subsidence between different genders that receive the uncemented total hip arthroplasty.2. There is no linear relationship between stem subsidence BMI and height.3. There is a linear correlation between subsidence of the prosthesis and body weight.Weight can be used for predicting prosthesis subsidence of patients after weight-bearing, while it is not meaningful for using height and BMI to predict the subsidence. In general, the male activity is generally higher than women, due to time constraints, the gender difference of subsidence should have long-term follow-up for further discussion. Total hip arthroplasty for patients with early weight training should consider the age, weight, gender and other relevant factors.