Learning curve of minimally invasive anterolateral approach in supine position for total hip arthroplasty

Abstract

BackgroundTotal hip arthroplasty (THA) using minimally invasive anterolateral approach in the supine position (ALS) is reported to achieve good clinical outcomes including lower dislocation rates and early clinical recovery. However, minimally invasive ALS THA is technically challenging, especially among surgeons who are newly introduced to these techniques. This study aimed to evaluate the learning curves associated with minimally invasive ALS THA. MethodsThis study divided 720 primary THAs with a minimally invasive ALS approach into three groups based on the number of previous procedures per surgeon (A:1–100, B:101–200, C: >201). Surgical time and perioperative complications were compared among the three groups. ResultsPerioperative complications were seen in 8.0% of patients, including periprosthetic fractures (4.2%), surgical site infection (1.3%), stem subsidence (1.0%), nerve palsy (0.6%), dislocation (0.4%), major bleeding (0.4%), and liner malseating (0.1%). The rate of perioperative complications in each group was 8.6% (30 patients), 10.9% (22 patients), and 3.5% (6 patients) in groups A, B, and C, respectively. Group C has a significantly lower rate than other groups. Group B has significantly higher surgical site infection rate than other groups. No statistically significant difference was found in the surgical times among the three groups. ConclusionThe learning curve associated with minimally invasive ALS THA was approximately 200 cases in terms of perioperative complications. Moderately experienced surgeons should always pay careful attention to avoid complications during ALS THA until they perform >200 cases.