Learning Curve Of Superpath Minimally Invasive Incision Total Hip Arthroplasty

Objective:To evaluate the learning curve of SuperPath minimally invasive total hip arthroplasty,a study was conducted on selected patientswith SuperPath minimally invasive total hip arthroplasty.Methods:By retrospective analysis,the clinical date of 78 patients(80 hips)undergoing SuperPath minimally invasive incision total hip arthroplasty from March 2016 to March 2018 in our department was collected.Those patients meeting inclusion criteria were divided into four groups(group A,B,C,D)by operation order,and each group has 20 hips.The general informations of each patient including incision length,operation time,intraoperative bleeding volume,hospitalization time and perioperative complications were recorded.Outpatient follow-up and telephone follow-up were conducted for postoperative to analyse postoperative complications and hip function score(Harris score).Statistical analysis was conducted on the collected case data,and the learning curve of SuperPath minimally invasive total hip replacement was comprehensively discussed according to the obtained data.Results:A total of 78 patients who met the inclusion and exclusion criteria were retrospectively analyzed.The age range was 29~80 years old,with an average age of(64.48±12.17)years old,including 29 males and 49 females.There were 43 cases of femoral neck fracture and 37 cases of ischemic necrosis of femoral head,which were divided into 4 groups according to the surgical sequence: A(n=20),B(n=20),C(n=20),D(n=20).Patients’ demographic data and hip joint disease in 4 groups have no statistically significant differences,and there are comparable.Complications: one case of periprosthetic fracture occurred in group A,but no complications such as joint dislocation,sciatic nerve injury,prosthesis loosening,periprosthetic infection and deep vein thromboembolism occurred in four group.In the assessment of hip function,Harris hip score atthe last follow-up of the four groups was significantly improved compared with that before surgery(P<0.05).There was no significant difference in the incision length and hospitalization time between the four groups(P>0.05).The analysis of the operation time and intraoperative blood lossshowed that thecomparison between group C and D had no statistical significance(P>0.05),while the pairwise comparison between each group had statistical significance(P<0.05).Conclusion:For surgeons familiar with the standard posterolateral approach,after the completion of about 40 cases of SuperPath minimally invasive total hip arthroplasty,the surgery can achieve a more familiar degree,and obtain the good clinical curative effect in the learning curve period.