Prosthesis Placement And Evaluation Of Hip Function After Total Hip Arthroplasty

Aim The purpose of this study is to analyze the effectiveness of Total Hip Arthroplasty for the treatment of osteoarthritis of Hip;to show to what extent the surgery improves the hip function,alleviates pain and gives the patients a better life.Despite all the complexities,challenges and reported failure rates,total hip arthroplasty(THA)represents the best choice of treatment for most patients with advanced,symptomatic osteoarthritis of the hip.In addition,the relatively young patients may affect the survival rate of survival.Biomechanically,the goal of primary surgery consists of reconstruction of the center of anatomical rotation.For the un-cemented implant,biological socket fixation shows better long-term results compared to cemented cups,especially in young patients.Methods a series of 30 patients were followed up.Patients who had any functional neurological or morphological disorders affecting gait were not included in this study.Each patient underwent clinical evaluation according to the Harris hip score and 30 patients were divided into excellent(Harris hip score more than 90 and between 80 and 89)and non-excellent(Harris hip score between 70 and 79 and less than 70)2 groups.The average Harris hip score of the excellent group,which included 22 cases,was 88.3,and the average Harris hip score of the non-excellent group,which included 8 cases,was 66.0.The anteversion angle and the abduction angle of acetabular cup the migration of the acetabular component of the femoral head rotation center the femoral offset and the body-weight lever arm the neck-shaft angle stem were measured from the radiograph using the Osiris419.software.The results were statistically analyzed by SPSS11.5,with a P value less than 0.05 indicating significant difference.Results 1.The non-excellent group had a greater abduction angle of acetabular cup than the excellent group reached statistical significance.The two groups had similar acetabular anteversion angle and neck-shaft angle.2.The vertical position of the femoral head center of excellent group was significantly lower than that of non-excellent group the ratio of operated FO to the BWLA and ratio of operated FO to the un-operated FO in the excellent group were significantly greater than those in non-excellent group.There was no significant difference in horizontal position of the femoral head center between the excellent group and the non-excellent group.3.The incidence of the migration of acetabular component and stem angulation >3° varus or valgus were not significantly different between the two groups.Conclusion Based on the results of the study,the abduction angle of acetabular cup the vertical position of the femoral head center the femoral offset should be considered as the most important factors which affect the reconstructed hip function after total hip arthroplasty.We believe that the position of the prosthesis should be controlled appropriately: the abduction angle in the range from 40° to 55°,the anteversion angle in the range from 10° to 20°,the appropriate position of the femoral head center and the appropriate femoral offset.A successful result depends on a complete pre-operative assessment of the patient,attention to the details of the surgical procedure with an adequate prosthesis,and a reasonable selection of indications.We can conclude that THA is an effective procedure,despite all the technical difficulties and reported failure rates.The results demonstrate a high rate of pain relief and functional improvement.The only limitation to this study is a short-term follow-up of the patients.